Per-Observation Detections Table
Each identified distinct X-ray source on the sky is represented in the catalog by one or more "source observation" entries—one for each observation contributing to the stack in which the source has been detected—and a single "master source" entry. The entries per observations record all of the properties about a detection extracted from a single observation, as well as associated file-based data products, which are observation-specific.
Note: Source properties in the catalog which have a value for each science energy band (type "double[6]", "long[6]", and "integer[6]" in the table below) have the corresponding letters appended to their names. For example, "flux_aper_b" and "flux_aper_h" represent the background-subtracted, aperture-corrected broad-band and hard-band energy fluxes, respectively.
Context | Column Name | Type | Units | Description |
---|---|---|---|---|
Observation Identification | obsid | integer | observation identifier (ObsID) | |
obi | integer | Observation Interval number (ObI) | ||
Pointing Information | targname | string | target name for the observation | |
ra_targ | double | deg | target position specified by observer, ICRS right ascension | |
dec_targ | double | deg | target position specified by observer, ICRS declination | |
ra_pnt | double | deg | mean spacecraft pointing during the observation, ICRS right ascension | |
dec_pnt | double | deg | mean spacecraft pointing during the observation, ICRS declination | |
roll_pnt | double | deg | mean spacecraft roll angle during the observation | |
chipx_pnt | double | pixel | detector (chip coordinates) Cartesian x position corresponding to (ra_pnt, dec_pnt) | |
chipy_pnt | double | pixel | detector (chip coordinates) Cartesian y position corresponding to (ra_pnt, dec_pnt) | |
chip_id_pnt | integer | detector (chip coordinates) identifier used to define (chipx_pnt, chipy_pnt) | ||
ra_nom | double | deg | observation tangent plane reference position, ICRS right ascension | |
dec_nom | double | deg | observation tangent plane reference position, ICRS declination | |
roll_nom | double | deg | observation tangent plane roll angle (used to determine tangent plane North) | |
Timing Information | gti_start | double | s | start time for the valid observation data in mission elapsed time (MET: seconds since 1998 Jan 01 00:00:00 TT) |
gti_stop | double | s | stop time for the valid observation data in mission elapsed time (MET: seconds since 1998 Jan 01 00:00:00 TT) | |
gti_elapse | double | s | total elapsed time of the observation (gti_stop - gti_start) | |
gti_obs | string | (TT) | start time of valid observation data (TT), ISO 8601 format (yyyy-mm-ddThh:mm:ss) | |
gti_end | string | (TT) | stop time of valid observation data (TT), ISO 8601 format (yyyy-mm-ddThh:mm:ss) | |
gti_mjd_obs | double | MJD (TT) | modified Julian date for the start time of the valid observation data (TT) | |
mjd_ref | double | MJD (TT) | modified Julian date reference corresponding to zero seconds mission elapsed time | |
Observing Cycle | ao | integer | Chandra observing cycle in which the observation was scheduled | |
Instrument Configuration | instrument | string | instrument used for the observation: 'ACIS' or 'HRC' | |
grating | string | transmission grating used for the observation: 'NONE', 'HETG', or 'LETG' | ||
datamode | string | instrument data mode used for the observation | ||
readmode | string | ACIS readout mode used for the observation: 'TIMED' or 'CONTINUOUS' | ||
cycle | string | ACIS readout cycle for alternating exposure (interleaved) mode observations: P (primary) or S (secondary). Value is P for all other ACIS modes. | ||
exptime | double | ACIS CCD frame time | ||
timing_mode | boolean | HRC precision timing mode | ||
Aspect Information | sim_x | double | mm | SIM focus stage position during observation |
sim_z | double | mm | SIM translation stage position during observation | |
dy | double | mm | mean aspect dy offset during observation | |
dz | double | mm | mean aspect dz offset during observation | |
dtheta | double | deg | mean aspect dtheta during observation | |
deltax | double | arcsec | SKY coordinate system X translation correction required to co-align observation astrometric frame within observation stack | |
deltay | double | arcsec | SKY coordinate system Y translation correction required to co-align observation astrometric frame within observation stack | |
deltarot | double | deg | SKY coordinate system roll angle correction required to co-align observation astrometric frame within observation stack | |
dscale | double | deg | SKY coordinate system scale factor correction required to co-align observation astrometric frame within observation stack | |
man_astrom_flag | boolean | SKY coordinate system scale factor correction required to co-align observation astrometric frame within observation stack | ||
Processing Information | ascdsver | string | software version used to create the Level 3 observation event data file | |
caldbver | string | calibration database version used to calibrate the Level 3 observation event data file | ||
crdate | string | creation date and time of the Level 3 event file, UTC | ||
Source Identification | region_id | integer | detection region identifier (component number) | |
Position and Position Errors | theta | double | arcmin | PSF 90% ECF aperture off-axis angle, θ |
phi | double | deg | PSF 90% ECF aperture azimuthal angle, φ | |
chipx | double | pixel | detector (chip coordinates) Cartesian x position corresponding to (theta, phi) (θ, φ) | |
chipy | double | pixel | detector (chip coordinates) Cartesian y position corresponding to (θ, φ) | |
chip_id | integer | detector (chip coordinates) identifier used to define (chipx, chipy) | ||
Source Significance | flux_significance | double[6] | significance of the single-observation detection determined from the ratio of the single-observation detection photon flux to the estimated error in the photon flux, for each $srcband; | |
likelihood | double[6] | significance of the single-observation detection computed by the single-observation detection algorithm for each source detection energy band | ||
Source Flags | conf_code | integer | compact detection may be confused (bit encoded: 1: background region overlaps another background region; 2: background region overlaps another source region; 4: source region overlaps another background region; 8: source region overlaps another source region; 256: compact detection is overlaid on an extended detection) | |
dither_warning_flag | boolean | highest statistically significant peak in the power spectrum of the detection source region count rate occurs at the dither frequency or at a beat frequency of the dither frequency of the observation | ||
edge_code | coded byte | detection position, or source or background region dithered off a detector boundary (chip pixel mask) during the observation (bit encoded: 1: background region dithers off detector boundary; 2:source region dithers off detector boundary; 4: detection position dithers off detector boundary) | ||
extent_code | integer[6] | detection is extended, or deconvolved compact detection extent is inconsistent with a point source at the 90% confidence level in one or more energy bands (bit encoded: 1, 2, 4, 8, 16, 32: deconvolved compact detection extent is not consistent with a point source in each science energy band | ||
multi_chip_code | byte | source position, or source or background region dithered multiple detector chips during the observation (bit encoded: 1: background region dithers across 2 chips; 2: background region dithers across >2 chips; 4: source region dithers across 2 chips; 8: source region dithers across >2 chips; 16: detection position dithers across 2 chips; 32: detection position dithers across >2 chips) | ||
pileup_warning | double | counts/frame/pixel | ACIS pile-up fraction estimated from the coiunt rate of the brightest 3x3 pixel island | |
sat_src_flag | boolean | detection is saturated; detection properties are unreliable | ||
streak_src_flag | boolean | detection is located on an ACIS readout streak; detection properties may be affected | ||
var_code | byte | detection displays flux variability in one or more energy bands (bit encoded: 1,2,4,8,16,32: intra-observation variability detected in each science energy band | ||
Source Extent and Errors | mjr_axis_raw | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the observed detection extent of a source for each science energy band |
mjr_axis_raw_lolim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the observed detection extent (68% lower confidence limit) for each science energy band | |
mjr_axis_raw_hilim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the observed detection extent (68% upper confidence limit) for each science energy band | |
mnr_axis_raw | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the observed detection extent for each science energy band | |
mnr_axis_raw_lolim | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the observed detection extent (68% lower confidence limit) for each science energy band | |
mnr_axis_raw_hilim | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the observed detection extent (68% upper confidence limit) for each science energy band | |
pos_angle_raw | double[6] | deg | position angle of the major axis of the ellipse defining the observed detection extent for each science energy band | |
pos_angle_raw_lolim | double[6] | deg | position angle of the major axis of the ellipse defining the observed detection extent (68% lower confidence limit) for each science energy band | |
pos_angle_raw_hilim | double[6] | deg | position angle of the major axis of the ellipse defining the observed detection extent (68% upper confidence limit) for each science energy band | |
psf_mjr_axis_raw | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the local PSF extent for each science energy band | |
psf_mjr_axis_raw_lolim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the local PSF extent (68% lower confidence limit) for each science energy band | |
psf_mjr_axis_raw_hilim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the local PSF extent (68% upper confidence limit) for each science energy band | |
psf_mnr_axis_raw | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the local PSF extent for each science energy band | |
psf_mnr_axis_raw_lolim | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the local PSF extent (68% lower confidence limit) for each science energy band | |
psf_mnr_axis_raw_hilim | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the local PSF extent (68% upper confidence limit) for each science energy band | |
psf_pos_angle_raw | double[6] | deg | position angle of the major axis of the ellipse defining the local PSF extent for each science energy band | |
psf_pos_angle_raw_lolim | double[6] | deg | position angle of the major axis of the ellipse defining the local PSF extent (68% lower confidence limit) for each science energy band | |
psf_pos_angle_raw_hilim | double[6] | deg | position angle of the major axis of the ellipse defining the local PSF extent (68% upper confidence limit) for each science energy band | |
major_axis | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the deconvolved detection extent for each science energy band | |
major_axis_lolim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the deconvolved detection extent (68% lower confidence limit) for each science energy band | |
major_axis_hilim | double[6] | arcsec | 1σ radius along the major axis of the ellipse defining the deconvolved detection extent (68% upper confidence limit) for each science energy band | |
minor_axis | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the deconvolved detection extent for each science energy band | |
minor_axis_lolim | double[6] | arcsec | 1σ radius along the minor axis of the ellipse defining the deconvolved detection extent (68% lower confidence limit) for each science energy band | |
minor_axis_hilim[6] | double | arcsec | 1σ radius along the minor axis of the ellipse defining the deconvolved detection extent (68% upper confidence limit) for each science energy band | |
pos_angle | double[6] | deg | position angle (referenced from local true north) of the major axis of the ellipse defining the deconvolved detection extent for each science energy band | |
pos_angle_lolim | double[6] | deg | position angle (referenced from local true north) of the major axis of the ellipse defining the deconvolved detection extent (68% lower confidence limit) for each science energy band | |
pos_angle_hilim | double[6] | deg | position angle (referenced from local true north) of the major axis of the ellipse defining the deconvolved detection extent (68% upper confidence limit) for each science energy band | |
src_area | double[6] | sq. arcseconds | area of the deconvolved detection extent ellipse, or area of the detection polygon for extended detections for each science energy band | |
Aperture Photometry | cnts_aper | long[6] | counts | total counts measured in the modified source region for each science energy band |
cnts_aperbkg | long[6] | counts | total counts measured in the modified background region for each science energy band | |
src_cnts_aper | double[6] | counts | aperture-corrected detection net counts inferred from the source region aperture for each science energy band | |
src_cnts_aper_lolim | double[6] | counts | aperture-corrected detection net counts inferred from the source region aperture (68% lower confidence limit) for each science energy band | |
src_cnts_aper_hilim | double[6] | counts | aperture-corrected detection net counts inferred from the source region aperture (68% upper confidence limit) for each science energy band | |
src_rate_aper | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the source region aperture for each science energy band | |
src_rate_aper_lolim | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the source region aperture (68% lower confidence limit) for each science energy band | |
src_rate_aper_hilim | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the source region aperture (68% upper confidence limit) for each science energy band | |
photflux_aper | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the source region aperture, calculated by counting X-ray events for each science energy band | |
photflux_aper_lolim | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the source region aperture, calculated by counting X-ray events (68% lower confidence limit) for each science energy band | |
photflux_aper_hilim | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the source region aperture, calculated by counting X-ray events (68% upper confidence limit) for each science energy band | |
flux_aper | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the source region aperture, calculated by counting X-ray events for each science energy band | |
flux_aper_lolim | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the source region aperture, calculated by counting X-ray events (68% lower confidence limit) for each science energy band | |
flux_aper_hilim | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the source region aperture, calculated by counting X-ray events (68% upper confidence limit) for each science energy band | |
cnts_aper90 | long[6] | counts | total counts observed in the modified PSF 90% ECF aperture for each science energy band | |
cnts_aper90bkg | long[6] | counts | total counts observed in the modified PSF 90% ECF background aperture for each science energy band | |
src_cnts_aper90 | double[6] | counts | aperture-corrected detection net counts inferred from the PSF 90% ECF aperture for each science energy band | |
src_cnts_aper90_lolim | double[6] | counts | aperture-corrected detection net counts inferred from the PSF 90% ECF aperture (68% lower confidence limit) for each science energy band | |
src_cnts_aper90_hilim | double[6] | counts | aperture-corrected detection net counts inferred from the PSF 90% ECF aperture (68% upper confidence limit) for each science energy band | |
src_rate_aper90 | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the PSF 90% ECF aperture for each science energy band | |
src_rate_aper90_lolim | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the PSF 90% ECF aperture (68% lower confidence limit) for each science energy band | |
src_rate_aper90_hilim | double[6] | counts s-1 | aperture-corrected detection net count rate inferred from the PSF 90% ECF aperture (68% upper confidence limit) for each science energy band | |
photflux_aper90 | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events for each science energy band | |
photflux_aper90_lolim | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events (68% lower confidence limit) for each science energy band | |
photflux_aper90_hilim | double[6] | photons s-1 cm-2 | aperture-corrected detection net photon flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events (68% upper confidence limit) for each science energy band | |
flux_aper90 | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events for each science energy band | |
flux_aper90_lolim | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events (68% lower confidence limit) for each science energy band | |
flux_aper90_hilim | double[6] | ergs s-1 cm-2 | aperture-corrected detection net energy flux inferred from the PSF 90% ECF aperture, calculated by counting X-ray events (68% upper confidence limit) for each science energy band | |
ra_aper90 | double[6] | deg | center of the PSF 90% ECF and PSF 90% ECF background apertures, ICRS right ascension for each science energy band | |
dec_aper90 | double[6] | deg | center of the PSF 90% ECF and PSF 90% ECF background apertures, ICRS declination for each science energy band | |
mjr_axis_aper90 | double[6] | arcsec | semi-major axis of the elliptical PSF 90% ECF aperture for each science energy band | |
mnr_axis_aper90 | double[6] | arcsec | semi-minor axis of the elliptical PSF 90% ECF aperture for each science energy band | |
pos_angle_aper90 | double[6] | deg | position angle (referenced from local true north) of the semi-major axis of the elliptical PSF 90% ECF aperture for each science energy band | |
mjr_axis1_aper90bkg | double[6] | arcsec | semi-major axis of the inner ellipse of the annular PSF 90% ECF background aperture for each science energy band | |
mnr_axis1_aper90bkg | double[6] | arcsec | semi-minor axis of the inner ellipse of the annular PSF 90% ECF background aperture for each science energy band | |
mjr_axis2_aper90bkg | double[6] | arcsec | semi-major axis of the outer ellipse of the annular PSF 90% ECF background aperture for each science energy band | |
mnr_axis2_aper90bkg | double[6] | arcsec | semi-minor axis of the outer ellipse of the annular PSF 90% ECF background aperture for each science energy band | |
pos_angle_aper90bkg | double[6] | deg | position angle (referenced from local true north) of the semi-major axes of the annular PSF 90% ECF background aperture for each science energy band | |
area_aper | double | sq. arcsec | area of the modified elliptical source region aperture (includes corrections for exclusion regions due to overlapping detections) | |
area_aperbkg | double | sq. arcseconds | area of the modified annular background region aperture (includes corrections for exclusion regions due to overlapping detections) | |
area_aper90 | double[6] | sq. arcseconds | area of the modified elliptical PSF 90% ECF aperture (includes corrections for exclusion regions due to overlapping detections) for each science energy band | |
area_aper90bkg | double[6] | sq. arcseconds | area of the modified annular PSF 90% ECF background aperture (includes corrections for exclusion regions due to overlapping detections for each science energy band | |
psf_frac_aper | double[6] | fraction of the PSF included in the modified elliptical source region aperture for each science energy band | ||
psf_frac_aperbkg | double[6] | fraction of the PSF included in the modified annular background region aperture for each science energy band | ||
psf_frac_aper90 | double[6] | fraction of the PSF included in the modified elliptical PSF 90% ECF aperture for each science energy band | ||
psf_frac_aper90bkg | double[6] | fraction of the PSF included in the modified annular PSF 90% ECF background aperture for each science energy band | ||
phot_nsrcs | integer[6] | number of detections fit simultaneously to compute aperture photometry quantities | ||
Model Energy Fluxes | flux_powlaw_aper | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] for each science energy band |
flux_powlaw_aper_lolim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] (68% lower confidence limit) for each science energy band | |
flux_powlaw_aper_hilim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] (68% upper confidence limit) for each science energy band | |
flux_bb_aper | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] for each science energy band | |
flux_bb_aper_lolim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] (68% lower confidence limit) for each science energy band | |
flux_bb_aper_hilim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] (68% upper confidence limit) for each science energy band | |
flux_brems_aper | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] for each science energy band | |
flux_brems_aper_lolim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] (68% lower confidence limit) for each science energy band | |
flux_brems_aper_hilim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] (68% upper confidence limit) for each science energy band | |
flux_apec_aper | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] for each science energy band | |
flux_apec_aper_lolim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] (68% lower confidence limit) for each science energy band | |
flux_apec_aper_hilim | double[6] | ergs s-1 cm-2 | source region aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] (68% upper confidence limit) for each science energy band | |
flux_powlaw_aper90 | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] for each science energy band | |
flux_powlaw_aper90_lolim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] (68% lower confidence limit) for each science energy band | |
flux_powlaw_aper90_hilim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed power-law model [NH = NH(Gal); γ = 2.0] (68% upper confidence limit) for each science energy band | |
flux_bb_aper90 | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] for each science energy band | |
flux_bb_aper90_lolim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] (68% lower confidence limit) for each science energy band | |
flux_bb_aper90_hilim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed black body model [NH = NH(Gal); kT = 0.75 keV] (68% upper confidence limit) for each science energy band | |
flux_brems_aper90 | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] for each science energy band | |
flux_brems_aper90_lolim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] (68% lower confidence limit) for each science energy band | |
flux_brems_aper90_hilim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed bremsstrahlung model [NH = NH(Gal); kT = 3.5 keV] (68% upper confidence limit) for each science energy band | |
flux_apec_aper90 | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] for each science energy band | |
flux_apec_aper90_lolim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] (68% lower confidence limit) for each science energy band | |
flux_apec_aper90_hilim | double[6] | ergs s-1 cm-2 | PSF 90% ECF aperture model energy flux inferred from the canonical absorbed APEC model [NH = NH(Gal); kT = 6.5 keV] (68% upper confidence limit) for each science energy band | |
Hardness Ratios | hard_hm | double | ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio | |
hard_hm_lolim | double | ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio (68% lower confidence limit) | ||
hard_hm_hilim | double | ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio (68% upper confidence limit) | ||
hard_hs | double | ACIS hard (2.0-7.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio | ||
hard_hs_lolim | double | ACIS hard (2.0-7.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% lower confidence limit) | ||
hard_hs_hilim | double | ACIS hard (2.0-7.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% upper confidence limit) | ||
hard_ms | double | ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio | ||
hard_ms_lolim | double | ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% lower confidence limit) | ||
hard_ms_hilim | double | ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% upper confidence limit) | ||
Spectral Properties | flux_powlaw | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum |
flux_powlaw_lolim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
flux_powlaw_hilim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
powlaw_gamma | double | photon index, defined as FE ∝ E-γ, of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
powlaw_gamma_lolim | double | photon index, defined as FE ∝ E-γ, of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
powlaw_gamma_hilim | double | photon index, defined as FE ∝ E-γ, of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | ||
powlaw_gamma_rhat | double | photon index convergence criterion of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
powlaw_nh | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | |
powlaw_nh_lolim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
powlaw_nh_hilim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
powlaw_nh_rhat | double | NH column density convergence criterion of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
powlaw_ampl | double | amplitude of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
powlaw_ampl_lolim | double | amplitude of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
powlaw_ampl_hilim | double | amplitude of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | ||
powlaw_ampl_rhat | double | amplitude convergence criterion of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
powlaw_stat | double | χ2 statistic per degree of freedom of the best fitting absorbed power-law model spectrum to the source region aperture PI spectrum | ||
flux_bb | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | |
flux_bb_lolim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
flux_bb_hilim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
bb_kt | double | keV | temperature (kT) of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | |
bb_kt_lolim | double | keV | temperature (kT) of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
bb_kt_hilim | double | keV | temperature (kT) of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
bb_kt_rhat | double | temperature (kT) convergence criterion of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | ||
bb_nh | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | |
bb_nh_lolim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
bb_nh_hilim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
bb_nh_rhat | double | NH column density convergence criterion of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | ||
bb_ampl | double | amplitude of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | ||
bb_ampl_lolim | double | amplitude of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
bb_ampl_hilim | double | amplitude of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum (68% upperer confidence limit) | ||
bb_ampl_rhat | double | amplitude convergence criterion of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | ||
bb_stat | double | χ2 statistic per degree of freedom of the best fitting absorbed black body model spectrum to the source region aperture PI spectrum | ||
flux_brems | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | |
flux_brems_lolim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
flux_brems_hilim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
brems_kt | double | keV | temperature (kT) of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | |
brems_kt_lolim | double | keV | temperature (kT) of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
brems_kt_hilim | double | keV | temperature (kT) of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
brems_kt_rhat | double | temperature (kT) convergence criterion of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | ||
brems_nh | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | |
brems_nh_lolim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
brems_nh_hilim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
brems_nh_rhat | double | NH column density convergence criterion of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | ||
brems_norm | double | amplitude of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | ||
brems_norm_lolim | double | amplitude of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
brems_norm_hilim | double | amplitude of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum (68% upperer confidence limit) | ||
brems_norm_rhat | double | amplitude convergence criterion of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | ||
brems_stat | double | χ2 statistic per degree of freedom of the best fitting absorbed bremsstrahlung model spectrum to the source region aperture PI spectrum | ||
flux_apec | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | |
flux_apec_lolim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
flux_apec_hilim | double | ergs s-1 cm-2 | net integrated 0.5-7.0 keV energy flux of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
apec_kt | double | keV | temperature (kT) of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | |
apec_kt_lolim | double | keV | temperature (kT) of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
apec_kt_hilim | double | keV | temperature (kT) of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
apec_kt_rhat | double | temperature (kT) convergence criterion of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_abund | double | abundance of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_abund_lolim | double | abundance of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
apec_abund_hilim | double | abundance of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | ||
apec_abund_rhat | double | abundance convergence criterion of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_z | double | redshift of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_z_lolim | double | redshift of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
apec_z_hilim | double | redshift of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | ||
apec_z_rhat | double | redshift convergence criterion Redshift of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_nh | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | |
apec_nh_lolim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | |
apec_nh_hilim | double | N HI atoms 1020 cm-2 | NH column density of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upper confidence limit) | |
apec_nh_rhat | double | NH column density convergence criterion of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_norm | double | amplitude of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_norm_lolim | double | amplitude of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% lower confidence limit) | ||
apec_norm_hilim | double | amplitude of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum (68% upperer confidence limit) | ||
apec_norm_rhat | double | amplitude convergence criterion of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
apec_stat | double | χ2 statistic per degree of freedom of the best fitting absorbed APEC model spectrum to the source region aperture PI spectrum | ||
Source Variability | var_index | integer[6] | intra-observation Gregory-Loredo variability index in the range [0, 10]: indicates whether the source region photon flux is constant within an observation (highest value across all stacked observations) for each science energy band | |
var_prob | double[6] | intra-observation Gregory-Loredo variability probability (highest value across all stacked observations) for each science energy band | ||
ks_prob | double[6] | intra-observation Kolmogorov-Smirnov test variability probability (highest value across all observations) for each science energy band | ||
kp_prob | double[6] | intra-observation Kuiper's test variability probability (highest value across all stacked observations) for each science energy band | ||
var_sigma | double[6] | counts s-1 | flux variability standard deviation, calculated from an optimally-binned light curve for each science energy band | |
var_mean | double[6] | counts s-1 | flux variability mean value, calculated from an optimally-binned light curve for each science energy band | |
var_min | double[6] | counts s-1 | flux variability minimum value, calculated from an optimally-binned light curve for each science energy band | |
var_max | double[6] | counts s-1 | flux variability maximum value, calculated from an optimally-binned light curve for each science energy band | |
Source Timing Information | livetime | double | s | effective single observation exposure time, after applying the good time intervals and the deadtime correction factor; vignetting and dead area corrections are NOT applied |
Source Instrument Information | detector | string | detector elements over which the background region bounding box dithers during the observation: HRC-I, HRC-S, or ACIS-<n>, where <n> is string of the CCD Ids (e.g. "ACIS-78"); see the ACIS focal plane figure in the POG. | |