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Proceedings Paper

Positional accuracy as a measure of Chandra's optical distortions
Author(s): Eli Beckerman; Tom Aldcroft; Terrance J. Gaetz; Diab H. Jerius; Dan Nguyen; Michael Tibbetts
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Paper Abstract

We present a study of Chandra's optical distortions by examining the positional accuracy of observed sources on the HRC-I. We investigate the Chandra mirror and detector models' ability to reproduce the detector locations of observed sources by simulating ~160 calibration observations of AR Lac, HR 1099, and LMC X-1. To study the optical distortions of the mirrors more directly, we compare a 63 ksec observation of the Orion Nebular Cluster (ONC) with positions based on the well-determined optical astrometry of the cluster. We simulate observations of 100 reasonably bright sources from the Hillenbrand 1997 catalog of the ONC and compare the simulated positions with their observed positions. Offsets between the optical positions and the observed X-ray positions help determine a map of the optical distortions of the Chandra mirrors.

Paper Details

Date Published: 3 February 2004
PDF: 12 pages
Proc. SPIE 5165, X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, (3 February 2004); doi: 10.1117/12.509381
Show Author Affiliations
Eli Beckerman, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Tom Aldcroft, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Terrance J. Gaetz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Diab H. Jerius, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Dan Nguyen, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Michael Tibbetts, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 5165:
X-Ray and Gamma-Ray Instrumentation for Astronomy XIII
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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