Cycle 21 PIMMS Effective Areas
Released as of 13 DEC 2018
The PIMMS Cycle 21 effective areas are illustrated below. As is always the case, the time-delay factor for the ACIS contaminant build-up has been updated; However, the ACIS CONTAM file has been updated as well for both ACIS-I and ACIS-S. This new CONTAM model predicts a somewhat reduced QE loss compared with the previous one. Additionally, the old HRC-I QE file has been replaced with a series of time-displaced QE files (i.e. files with sequential validity start dates, in CalDB 4.7.9), and the HRC-S QEU time-dependent files have been updated as well (in CalDB 4.8.2).
The model OBS_IDs and the ARF-building scripts have now been standardized for Chandra PIMMS calculations. Hence the procedures are the same as with cy20.
The Cycle 21 PIMMS Effective Area Public Information describes how the effective area files were generated, including the new HETG and LETG GREFFs and the new HRC-S QE file.
Effective area plots are provided for the following detector configurations: