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Proceedings Paper

Characterizing nonlinearities in the Chandra LETG+HRC-S dispersion relation
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Paper Abstract

The Chandra Low Energy Transmission Grating Spectrometer (LETGS) is comprised of 3 micro-channel plate (MCP) segments and is primarily used with the High Resolution Camera spectroscopic array (HRC-S). In-flight calibration data observed with the LETG+HRC-S show that there are non-linear deviations in the positions of some lines by as much as 0.1 Å. These deviations are thought to be caused by spatial non-linearities in the imaging characteristics of the HRC-S detector. Here, we present the methods we used to characterize the non-linearities of the dispersion relation across the central plate of the HRC-S, and empirical corrections which greatly reduce the observed non-linearities by a factor of 2 or more on the central MCP.

Paper Details

Date Published: 11 October 2004
PDF: 10 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.552194
Show Author Affiliations
Sun Mi Chung, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jeremy J. Drake, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Vinay L. Kashyap, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter W. Ratzlaff, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Bradford J. Wargelin, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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