- 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 Sep 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.
- OCT registered-photon-map in fits
Statistics:
# IMAGE NPIX MEAN RMS MIN MAX
ACIS_oct08 6004901 7.601 11.44 0.0 620.0
I2 node 0 262654 8.783039 3.544228 0.0 53.0
I2 node 1 262654 9.371016 3.942193 0.0 237.0
I2 node 2 262654 9.229095 3.600795 0.0 73.0
I2 node 3 262654 9.063945 3.828630 0.0 62.0
I3 node 0 262654 8.696564 3.505404 0.0 44.0
I3 node 1 262654 9.363407 8.897332 0.0 202.0
I3 node 2 262654 8.455702 3.365617 0.0 66.0
I3 node 3 262654 8.446270 3.425137 0.0 148.0
S2 node 0 262654 10.268627 3.629760 0.0 231.0
S2 node 1 262654 10.513371 4.119386 0.0 77.0
S2 node 2 262654 10.954469 4.131824 0.0 620.0
S2 node 3 262654 10.533275 3.798765 0.0 612.0
S3 node 0 262654 11.205848 6.939780 0.0 243.0
S3 node 1 262654 11.249490 4.192224 0.0 69.0
S3 node 2 262654 11.560183 4.952568 0.0 94.0
S3 node 3 262654 10.368795 3.753092 0.0 51.0
- Jul 1999 - Oct 2008 registered-photon-map in fits
Statistics:
IMAGE NPIX MEAN RMS MIN MAX
ACIS_total 6004901 1185.92 1624.72 0.0 72308.0
I2 node 0 262654 921.525486 165.410117 0.0 4161.0
I2 node 1 262654 974.599303 226.104639 0.0 15474.0
I2 node 2 262654 989.284672 190.965450 0.0 8366.0
I2 node 3 262654 990.850849 242.885651 0.0 27231.0
I3 node 0 262654 1043.298495 253.074831 0.0 5535.0
I3 node 1 262654 1082.757664 778.297035 0.0 20621.0
I3 node 2 262654 962.705377 164.195629 0.0 4123.0
I3 node 3 262654 951.001434 176.407771 0.0 17667.0
S2 node 0 262654 1422.163649 185.347709 698.0 19766.0
S2 node 1 262654 1508.656003 308.376884 721.0 7830.0
S2 node 2 262654 1684.205090 315.595694 950.0 11114.0
S2 node 3 262654 1628.271908 238.104423 928.0 21329.0
S3 node 0 262654 2515.987665 1276.904267 1012.0 10911.0
S3 node 1 262654 3727.777879 1783.431976 0.0 11817.0
S3 node 2 262654 2727.801045 808.223079 906.0 6143.0
S3 node 3 262654 2046.595670 329.881167 1066.0 8133.0
- OCT 2008 dose PNG image
- OCT I3 dose PNG image
- OCT S3 dose PNG image
- TOTAL JUL 1999 - OCT 2008 dose PNG image
- TOTAL I3 dose PNG image
- TOTAL S3 dose PNG image
- Integrated Exposure Maps of Last 12 Months
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| Jul 2008 |
Apr 2008 |
Jan 2008 |
Oct 2007 |
- 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: -117.66 C std dev: 1.49
mean width: 0.26 days std dev: 0.16
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.
- Bad Pixels
The plots below were generated with a new warm pixel finding script. Please see
Acis Bad Pixel Page
for details.
Front Side CCDs
Back Side CCD (CCD5)
-
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
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