HRC-I Quantum Efficiencey Verification
Cross-Cal HRC-I with ACIS-S3 using SN Remnant G21.5-0.9
K. Tabetha Hole, Deron Pease, Hank Donnelly
For this study we employed the supernova remnant G21.5-0.9 to perform cross-calibration of HRC-I (ObsID 1242) with ACIS-S3 (ObsIDs 159,1230), for energies greater than 1.0 keV.
The predicted counts with total model uncertainties are: 7799 ± 11.3%
The background-subtracted observed counts are: 7928 ± 1.3%
So even though HRC-I actually sees 1.6% more (absolute
difference) than predicted by our model, the observed matches the predicted
within the 11.3% total model uncertainty.
1) NORBERT's MODEL for G21.5-0.9 derived from ACIS-S3 mo = wabs( powerlaw ) Model Fit Model Component Parameter Unit Value par par comp 1 1 1 wabs nH 10^22 2.119 +/- 0.3929E-01 2 2 2 powerlaw PhoIndex 1.919 +/- 0.3259E-01 3 3 2 powerlaw norm 1.7820E-02 +/- 0.8404E-03 source model uncertainity of 5.3%
Last modified: 09/25/12
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