Cycle 27 PIMMS Effective Areas
Released as of 19 DEC 2024
The PIMMS Cycle 27 effective areas are illustrated below. As is always the case, the time-delay factor for the ACIS contaminant build-up has been updated. No other changes to ACIS calibrations have been implemented since Cycle 26. 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 cy26.
The Cycle 27 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:
