Cycle 23 PIMMS Effective Areas
Released as of 15 DEC 2020
The PIMMS Cycle 23 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. The new model anticipates extended linear growth of the Carbon layer depth with time, which further increases the predicted effect relative to last year's model. The HRC-I and HRC-S configurations include new estimates of the central QE, and HRC-S includes and update to the current QEU file as well.
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 cy22.
The Cycle 23 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:
