Last modified: 8 December 2020

URL: https://cxc.cfa.harvard.edu/caldb/prop_plan/pimms/index.html

Cycle 23 PIMMS Effective Areas

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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:


Left Column: Linear Scale

Center Column: Log Scale

Right Column: Difference Plot

ACIS-I Aimpoint Effective Areas

The black traces indicate ACIS effective areas uncorrected for OBF contamination.
Linear plot of ACIS-I aimpoint     effective area Logarithmic plot of ACIS-I aimpoint     effective area Diff plot of ACIS-I aimpoint     effective area

ACIS-S Aimpoint Effective Areas

The black traces indicate ACIS effective areas uncorrected for OBF contamination.
Linear plot of ACIS-S aimpoint     effective area Logarithmic plot of ACIS-S     aimpoint effective area Diff plot of ACIS-S     aimpoint effective area

HRC-I Aimpoint Effective Areas

Linear plot of HRC-I aimpoint     effective area Logarithmic plot of HRC-I     aimpoint effective area Diff plot of HRC-I     aimpoint effective area

HRC-S Aimpoint Effective Areas

Linear plot of HRC-S aimpoint     effective area Logarithmic plot of HRC-S     aimpoint effective area Diff plot of HRC-S     aimpoint effective area

HETG/ACIS-I Effective Areas

Linear plot of     HETG/ACIS-I zeroth-order effective area Logarithmic plot of     HETG/ACIS-I zeroth-order effective area Diff plot of     HETG/ACIS-I zeroth-order effective area

HETG/ACIS-S Effective Areas

Linear plot of     HETG/ACIS-S zeroth-order effective area Logarithmic plot of     HETG/ACIS-S zeroth-order effective area Diff plot of     HETG/ACIS-S zeroth-order effective area
Linear plot of     HETG/ACIS-S first-order MEG effective area Logarithmic plot of     HETG/ACIS-S first-order MEG effective area Diff plot of     HETG/ACIS-S first-order MEG effective area
Linear plot of     HETG/ACIS-S first-order HEG effective area Logarithmic plot of     HETG/ACIS-S first-order HEG effective area Diff plot of     HETG/ACIS-S first-order HEG effective area
Linear plot of     HETG/ACIS-S first-order HEG+MEG effective area Logarithmic  plot of     HETG/ACIS-S first-order HEG+MEG effective area Diff plot of     HETG/ACIS-S first-order HEG+MEG effective area

LETG/ACIS-I Effective Areas

Linear plot of     LETG/ACIS-I zeroth-order effective area Logarithmic plot of     LETG/ACIS-I zeroth-order effective area Diff plot of     LETG/ACIS-I zeroth-order effective area

LETG/ACIS-S Effective Areas

Linear plot of     LETG/ACIS-S zeroth-order effective area Logarithmic plot of     LETG/ACIS-S zeroth-order effective area Diff plot of     LETG/ACIS-S zeroth-order effective area
Linear plot of     LETG/ACIS-S first-order effective area Logarithmic plot of     LETG/ACIS-S first-order effective area Diff plot of     LETG/ACIS-S first-order effective area

LETG/HRC-I Effective Areas

Linear plot of     LETG/HRC-I zeroth-order effective area Logarithmic plot of     LETG/HRC-I zeroth-order effective area Diff plot of     LETG/HRC-I zeroth-order effective area

LETG/HRC-S Effective Areas

Linear plot of     LETG/HRC-S zeroth-order effective area Logarithmic plot of     LETG/HRC-S zeroth-order effective area Diff plot of     LETG/HRC-S zeroth-order effective area
Linear plot of     LETG/HRC-S first-order effective area Logarithmic plot of     LETG/HRC-S first-order effective area Diff plot of     LETG/HRC-S first-order effective area
Linear plot of     LETG/HRC-S second- to tenth-order summed effective area Logarithmic plot of     LETG/HRC-S second- to tenth-order summed effective area Diff plot of     LETG/HRC-S second- to tenth-order summed effective area

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