- ACIS DOSE registered-photon-map
The steps we took to compute the dose map are;
- Level 1 Event files for a specified month are obtained from archive.
- Image data including I2, I3, S2, S3 CCDs are extracted from all event files.
- All the extracted image data were merged to create a month long exposure map for the month.
- The exposure map is opened with ds9, and check a distribution of count rates against energy.
From this, estimate the upper threshold value. Any events beyond this upper threshold are
assumed erroneous events such as bad pixels.
- Using this upper threshold, the data is filtered, and create a cleaned exposure map for the month.
- The exposure map from each month from the Aug 1999 is added up to create a cumulative exposure
map for each month.
- Using fimgstatistic, we compute count rate statistics for each CCDs.
- For observations with high data drop rates (e.g., Crab nebula, Cas A), we corrected the
observations by adding events.
Note: Counts and RMS's of Cumulative maps are lower than the previous months. This is because we excluded
extreme outliers.
Please check more detail plots at Telemetered Photon Dose Trend page.
- DEC registered-photon-map in fits
Statistics:
# IMAGE NPIX MEAN RMS MIN MAX
ACIS_dec06 6004901 8.18 11.86 0.0 717.0
I2 node 0 262654 6.800404 2.977706 0.0 39.0
I2 node 1 262654 7.224385 3.386044 0.0 329.0
I2 node 2 262654 7.054157 3.020913 0.0 43.0
I2 node 3 262654 7.057454 3.242488 0.0 44.0
I3 node 0 262654 7.961887 3.333708 0.0 38.0
I3 node 1 262654 8.392006 7.811122 0.0 177.0
I3 node 2 262654 7.671119 3.157976 0.0 35.0
I3 node 3 262654 7.705826 3.254960 0.0 162.0
S2 node 0 262654 12.066789 4.416334 0.0 446.0
S2 node 1 262654 12.278136 4.831094 0.0 93.0
S2 node 2 262654 12.686432 4.635417 0.0 93.0
S2 node 3 262654 12.145383 4.157060 0.0 398.0
S3 node 0 262654 14.385666 4.620106 1.0 86.0
S3 node 1 262654 15.827066 5.179847 0.0 125.0
S3 node 2 262654 15.404588 4.439497 1.0 364.0
S3 node 3 262654 14.363445 4.198408 0.0 163.0
- Jul 1999 - Dec 2006 registered-photon-map in fits
Statistics:
IMAGE NPIX MEAN RMS MIN MAX
ACIS_total 6004901 967.54 1346.72 0.0 57077.0
I2 node 0 262654 692.474224 121.440019 0.0 2824.0
I2 node 1 262654 731.076149 166.593171 0.0 7689.0
I2 node 2 262654 743.712627 140.110046 0.0 2595.0
I2 node 3 262654 748.849303 178.555863 0.0 3487.0
I3 node 0 262654 796.624733 202.771688 0.0 4883.0
I3 node 1 262654 816.902161 552.481976 0.0 14882.0
I3 node 2 262654 728.910466 120.915378 0.0 2905.0
I3 node 3 262654 720.260838 130.865722 0.0 13374.0
S2 node 0 262654 1112.148108 138.192422 520.0 12470.0
S2 node 1 262654 1181.010508 238.302726 558.0 5804.0
S2 node 2 262654 1338.843539 268.076097 742.0 9157.0
S2 node 3 262654 1303.014108 214.460638 749.0 11088.0
S3 node 0 262654 2167.284543 1212.714979 817.0 10429.0
S3 node 1 262654 3332.341122 1741.441257 0.0 11444.0
S3 node 2 262654 2338.566762 762.699890 673.0 4897.0
S3 node 3 262654 1713.952295 297.742037 851.0 7205.0
- DEC 2006 dose PNG image
- DEC I3 dose PNG image
- DEC S3 dose PNG image
- TOTAL JUL 1999 - DEC 2006 dose PNG image
- TOTAL I3 dose PNG image
- TOTAL S3 dose PNG image
- Integrated Exposure Maps of Last 12 Months
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| Sep 2006 |
Jun 2006 |
Mar 2006 |
Dec 2005 |
- The Mean Detrended CTI
We report CTIs with a refined data definition. CTIs were computed for the temperature
dependency corrected data.
Please see
CTI page
for detailed explanation.
CTI's are computed for Mn K alpha, and defined as slope/intercept x10^4 of row # vs ADU.
Data file here
- Focal Plane Temperature
The Mean (max) FPT: -116.51 std dev: 2.33
mean width: 0.75 days std dev: 0.43
We are using 10 period moving averages to show
trends of peak temperatures and peak widths.
Note, the gaps in the width plot are due to missing/corrupted data.
The following is a plot of focal plane temperature and sun angle, earth angle, and altitude.
-
Acis Count Rate Plot
This monitors the ACIS count Rate vs. EPHIN count Rate.
No sources or CTI observations are removed. For daily updates see:
Ephin/Acis Info
- Science instrument background rates
This page shows scientific instrument background data based on Acis
observations. A source region file is generated using get_srcregions
and then the input event file is filtered using the regions in that file
to remove the sources.
| Name | Low (keV) | High(KeV) | Description |
|---|
| SSoft | 0.00 | 0.50 | Super soft photons |
|---|
| Soft | 0.50 | 1.00 | Soft photons |
|---|
| Med | 1.00 | 3.00 | Moderate energy photons |
|---|
| Hard | 3.00 | 5.00 | Hard Photons |
|---|
| Harder | 5.00 | 10.00 | Very Hard photons |
|---|
| Hardest | 10.00 | | Beyond 10 keV |
|---|
The following three plots show trends of SIB from year 2000.
CCDs shown here are CCD3, CCD5, and CCD7. Fitted lines are linear fit after eliminating extreme
outliers. For >10 keV plots, 2 lines are fit. One is with a 13 keV filter, and
another without.
CCD 3
CCD 5
CCD 7
- HRC
- Gratings
- Focus
We plot the width of the zero order streak of ACIS/HETG observations and
the width of the zero order image for HRC/LETG observations of point sources.
No significant defocusing trend is seen at this time. See
Gratings Focus
pages.
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