Updating the Chandra HETGS efficiencies using in-orbit observations

Herman L Marshall

doi:10.1117/12.927209

17 September 2012 Updating the Chandra HETGS efficiencies using in-orbit observations

Herman L Marshall

Proceedings Volume 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray; 844348 (2012) https://doi.org/10.1117/12.927209
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The efficiencies of the gratings in the High Energy Transmission Grating Spectrometer (HETGS) were updated using in-light observations of bright continuum sources. The procedure first involved verifying that fluxes obtained from the +1 and -1 orders match, which checks that the contaminant model and the CCD quantum efficiencies agree. Then the fluxes derived using the high energy gratings (HEGs) were compared to those derived from the medium energy gratings (MEGs). The flux ratio was fit to a low order polynomial, which was allocated to the MEGs above 1 keV or the HEGs below 1 keV. The resultant efficiencies were tested by examining fits to blazar spectra.

Citation Download Citation

Herman L Marshall "Updating the Chandra HETGS efficiencies using in-orbit observations", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844348 (17 September 2012); https://doi.org/10.1117/12.927209

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