Measurements with the Chandra X-Ray Observatory's flight contamination monitor

Details Measurements with the Chandra X-Ray Observatory's flight contamination monitor Measurements with the Chandra X-Ray Observatory's flight contamination monitor

2000-04-11

arxiv.org/abs/astro-ph/0004152v1

Astronomy and Astrophysics

Astrophysics

7pages,8figures,for SPIE 4012, paper 70

Scientific paper

NASA's Chandra X-ray Observatory includes a Flight Contamination Monitor (FCM), a system of 16 radioactive calibration sources mounted to the inside of the Observatory's forward contamination cover. The purpose of the FCM is to verify the ground-to-orbit transfer of the Chandra flux scale, through comparison of data acquired during the ground calibration with those obtained in orbit, immediately prior to opening the Observatory's sun-shade door. Here we report results of these measurements, which place limits on the change in mirror--detector system response and, hence, on any accumulation of molecular contamination on the mirrors' iridium-coated surfaces.

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