Cycle 10 PIMMS Effective Area Public Information
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PIMMS effective area (EA) files are built using model observations (OBSIDs) with standard/default detector and SIM_Z configurations with the CIAO 3.4 routines mkarf for imaging aimpoint cases and mkgarf for gratings configurations, using the most current CALDB input files (CALDB 3.4.1). The following table gives the input CALDB file information used by mkarf or mkgarf to generate the respective effective area files (as ARFs) for the CY09 (N0009) and CY10 (N0010) review cycles. Plots of the PIMMS effective areas may be viewed at the PIMMS Effective Area Data page. You may also use the automated Chandra Effective Area Viewer.
General PIMMS Changes for Cycle 10: There have been several mostly minor updates for PIMMS effective areas (EA's) between CY09 and CY10. They are in one of five areas:
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Imaging aimpoints: The slow optical axis drift (with respect to the Science Instrument Module (SIM) has continued with the progress of the mission. Hence the default position for an imaging observation strikes each detector in a slightly different place. We include default Y- and Z- offsets to optimize the chipx and chipy positions for ACIS-I and ACIS-S. The change in position presents a slightly different QE and mirror vignetting in the CIAO modeling that is done to calculate PIMMS EA's.
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ACIS FI chip Dead Area correction: This is a 2.5-4% reduction in the available area of the detector due to cosmic rays. The effect is tiny and uncalibrated for the BI chips, so no correction is included for them.
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ACIS CONTAM time-delay shift: For each cycle the future OBF contamination level is projected for the mid-point of the anticipated observation period. For CY10 the time and date are set for 15 May 2009, whereas for CY09 it was set for 15 May 2008. This produces at most a 1.5% decrease in the aimpoint effective area, mainly near the Carbon K-edge, from CY09 to CY10.
-
The HETG/ACIS-S model obsid has changed from 2527 to 7280, which results in a significant shift in the location of the chip gaps and the S1 chip in energy space, and the source position for the zeroth order QE. This results in the apparently large oscillating differences between the HEG 1st and MEG 1st order areas. ObsID 7280 is more representative of the default source location for HETG/ACIS-S, and we have made this switch now to keep pace with the evolution of the defaults, despite the sudden changes between CY09 and CY10 here.
-
HRC-S QE near the Oxygen K-edge: The HRC-S QE upgrade from version N0008 to N0009 was approved and installed in CalDB 3.3.0 in January 2007. So, version N0009 must now be used in the CY10 PIMMS calculations. The effect is very narrow near the Oxygen K-edge, and produces a 10% narrow spike in the EA curve at that point for HRC-S.
Summary of PIMMS changes for ACIS:
Beginning with Cycle 05, a correction for the time-dependent
contaminant absorption has been included in all ACIS-related
PIMMS effective areas. Cycle 10 PIMMS EA's have been projected
for 15 May 2009 using the most recent model for the time dependence of the ACIS QE
(aka CONTAM), which
includes the spatial dependence of the contaminating layer
on the ACIS OBF. The date projection was done using the
Summary of changes for HRC-I: The only change here is to the aimpoints and the applicable energy range, which has been extended to include the 60-100 eV range at the lower end.
Summary of changes for HRC-S: There has been an upgrade to the HRC-S QE file from last cycle, and it includes more accurate detailing of the O K-edge. The aimpoint and the energy range have also been updated.
Summary of changes for HETG/ACIS-S Here, the model ObsID has been updated to 7280, which has a Y-offset and source position that is more representative of the defaults for this case. The net change in the effective area from last year, over the full energy range, is not significant; however, the newer observation has the chip gaps and the S1 position somewhat shifted, resulting some shifts on the difference plots for this configuration. We elect to deal with these changes now, rather than to delay the changes to another cycle. Some users may find the EAs over narrow energy bands are significantly different. Detailed modeling of any specific source is necessary to ensure that chip gaps are optimally placed by varying the Y-offset if necessary.
In addition, the CONTAM correction has been updated, as with the other ACIS configurations above, and the ACIS DEAD AREA corrections have been added for the FI chips in the array. These amount to only a few percent changes in the EA.
Summary of changes for LETG/ACIS-S Here, the model ObsID has NOT been updated, and so the source position and chip gaps are exactly the same as before. The CONTAM has been updated as with the ACIS configurations above, and the DEAD AREA correction, a less-than-4% effect, has been added to the FI chips only.
Summary of changes for LETG/HRC-I: The default aimpoint has been changed for HRC-I, just as it has been for the HRC-I imaging case above. This amounts to a trivial change in the QE only, due to the very slight position shift. The 60-100eV energy range has also been added at the lower end of the spectrum.
Summary of changes for LETG/HRC-S: The new HRC-S QE has been applied here, as with the HRC-S imaging configuration above, contributing a very narrow region in which a 10% spike occurs in the differences from the CY09 traces at the Oxygen K-edge. The model ObsID is still 331, and hence the source position is not changed, nor are the two HRC-S chip gaps shifted at all from last cycle.
| Configuration | (CHIPX, CHIPY) | ObsID Used | HRMA | QE | QEU | ACIS FI DEAD AREA | ACIS CONTAM | CONTAM TIME DELAY | ACIS OSIP | GREFF | CALDB Filenames |
| ACIS-I |
(949, 978) (972, 964) |
2858 | hrmaD1996-12-20axeffaN0007.fits | acisD1997-04-17qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
N/A | N/A |
acisiD2006-10-26pimmsN0009.fits
acisiD2007-11-04pimmsN0010.fits |
| ACIS-S |
(215, 497) (224, 520) |
2850 8510 |
hrmaD1996-12-20axeffaN0007.fits | acisD1997-04-17qeN0006.fits | acisD2000-01-29qeuN0006.fits | N/A | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
N/A | N/A |
acissD2006-10-26pimmsN0009.fits
acissD2007-11-04pimmsN0010.fits |
| HRC-I | (7638.84, 7796.56) (7630.41, 7845.24) |
2608 | hrmaD1996-12-20axeffaN0007.fits | hrciD1999-07-22qeN0007.fits | hrciD1999-07-22qeuN0002.fits | N/A | N/A | N/A | N/A | N/A |
hrciD2006-10-26pimmsN0009.fits
hrciD2007-11-04pimmsN0010.fits |
| HRC-S | (2287.42, 8935.69) (2092.44, 8948.17) |
2650 |
hrmaD1996-12-20axeffaN0007.fits | hrcsD1999-07-22qeN0008.fits hrcsD1999-07-22qeN0009.fits | hrcsD1999-07-22qeuN0004.fits | N/A | N/A | N/A | N/A | N/A |
hrcsD2006-10-26pimmsN0009.fits
hrcsD2007-11-04pimmsN0010.fits |
| HETG0/ACIS-I |
(949, 978) (972, 964) |
2858 | hrmaD1996-12-20axeffaN0007.fits | acisD1997-04-17qeN0005.fits acisD2000-01-29qeN0006.fits |
acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | hetgD1996-11-01greffpr001N0005.fits |
acisihetg0D2006-10-26pimmsN0009.fits
acisihetg0D2007-11-04pimmsN0010.fits |
| HETG0/ACIS-S |
(290, 393) (231, 393) |
2527 7280 |
hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | hetgD1996-11-01greffpr001N0005.fits |
acisshetg0D2006-10-26pimmsN0009.fits
acisshetg0D2007-11-04pimmsN0010.fits |
| HEG1/ACIS-S |
(290, 393) (231, 393) |
2527 7280 |
hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | hetgD1996-11-01greffpr001N0005.fits |
acissheg1D2006-10-26pimmsN0009.fits
acissheg1D2007-11-04pimmsN0010.fits |
| HEGMEG1/ACIS-S |
(290, 393) (231, 393) |
2527 7280 |
hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | hetgD1996-11-01greffpr001N0005.fits |
acisshegmeg1D2006-10-26pimmsN0009.fits
acisshegmeg1D2007-11-04pimmsN0010.fits |
| MEG1/ACIS-S |
(290, 393) (231, 393) |
2527 7280 |
hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | hetgD1996-11-01greffpr001N0005.fits |
acissmeg1D2006-10-26pimmsN0009.fits
acissmeg1D2007-11-04pimmsN0010.fits |
| LETG0/ACIS-S | (293, 190) | 2297 | hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | letgD1996-11-01greffpr001N0005.fits |
acissletg0D2006-10-26pimmsN0009.fits
acissletg0D2007-11-04pimmsN0010.fits |
| LEG1/ACIS-S | (293, 190) | 2297 | hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | letgD1996-11-01greffpr001N0005.fits |
acissleg1D2006-10-26pimmsN0009.fits
acissleg1D2007-11-04pimmsN0010.fits |
| LETG0/ACIS-I |
(949, 978) (972, 964) |
2858 | hrmaD1996-12-20axeffaN0007.fits | acisD2000-01-29qeN0006.fits | acisD2000-01-29qeuN0006.fits | acisD1999-09-16dead_areaN0001.fits | acisD1999-08-13contamN0004.fits | 327196864.184 358732865.184 |
acisD2000-01-29osip_ctiN0006.fits | letgD1996-11-01greffpr001N0005.fits |
acisiletg0D2006-10-26pimmsN0009.fits
acisiletg0D2007-11-04pimmsN0010.fits |
| LETG0/HRC-I | (7638.84, 7796.56) (7630.41, 7845.24) |
2608 | hrmaD1996-12-20axeffaN0007.fits | hrciD1999-07-22qeN0007.fits | hrciD1999-07-22qeuN0002.fits | N/A | N/A | N/A | N/A | letgD1996-11-01greffpr001N0005.fits |
hrciletg0D2006-10-26pimmsN0009.fits
hrciletg0D2007-11-04pimmsN0010.fits |
| LETG0/HRC-S | (2201, 8977) | 331 | hrmaD1996-12-20axeffaN0007.fits | hrcsD1999-07-22qeN0008.fits hrcsD1999-07-22qeN0009.fits |
hrcsD1999-07-22qeuN0004.fits | N/A | N/A | N/A | N/A | letgD1996-11-01greffpr001N0005.fits |
hrcsletg0D2006-10-26pimmsN0009.fits
hrcsletg0D2007-11-04pimmsN0010.fits |
| LEG1/HRC-S | (2201, 8977) | 331 | hrmaD1996-12-20axeffaN0007.fits | hrcsD1999-07-22qeN0008.fits hrcsD1999-07-22qeN0009.fits |
hrcsD1999-07-22qeuN0004.fits | N/A | N/A | N/A | N/A | letgD1996-11-01greffpr001N0005.fits |
hrcsleg1D2006-10-26pimmsN0009.fits
hrcsleg1D2007-11-04pimmsN0010.fits |
| LEGHI/HRC-S | (2201, 8977) | 331 | hrmaD1996-12-20axeffaN0007.fits | hrcsD1999-07-22qeN0008.fits hrcsD1999-07-22qeN0009.fits |
hrcsD1999-07-22qeuN0004.fits | N/A | N/A | N/A | N/A | letgD1996-11-01greffpr001N0005.fits |
hrcsleghiD2006-10-26pimmsN0009.fits
hrcsleghiD2007-11-04pimmsN0010.fits |
Notes for Table 1:
None.
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