Share Email Print
cover

Proceedings Paper

Characterizing, controlling, and correcting distortions in the COS FUV detector
Author(s): David J. Sahnow; George D. Becker; John H. Debes; Justin Ely; Sean A. Lockwood; Derck Massa; Cristina M. Oliveira; Steven V. Penton; Charles Proffitt; Julia Roman-Duval; Hugues Sana; Paule Sonnentrucker; Joanna Taylor
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The Far Ultraviolet (FUV) detector on the Cosmic Origins Spectrograph (COS) of the Hubble Space Telescope (HST) is subject to a variety of distortions due to its analog nature. Thermal variations of the detector and electronics stretch and shift the active area. Geometric distortions on a range of spatial scales warp the two-dimensional spectral image. Changes due to detector walk – the dependence of detected position on pulse height – add distortions that change as a function of time. The calcos calibration pipeline includes corrections for each of these effects in the calibrated spectra, but these are imperfect, and they do not help with the target acquisition process, which uses raw detector coordinates. We discuss these distortions and their effect on the data, our attempts to mitigate them, the current pipeline corrections and their success at removing the effects, and possible modifications to improve the data quality in the future.

Paper Details

Date Published: 18 September 2015
PDF: 8 pages
Proc. SPIE 9601, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX, 96010Q (18 September 2015); doi: 10.1117/12.2188529
Show Author Affiliations
David J. Sahnow, Space Telescope Science Institute (United States)
George D. Becker, Space Telescope Science Institute (United States)
John H. Debes, Space Telescope Science Institute (United States)
Justin Ely, Space Telescope Science Institute (United States)
Sean A. Lockwood, Space Telescope Science Institute (United States)
Derck Massa, Space Science Institute (United States)
Cristina M. Oliveira, Space Telescope Science Institute (United States)
Steven V. Penton, Space Telescope Science Institute (United States)
Charles Proffitt, Space Telescope Science Institute (United States)
Julia Roman-Duval, Space Telescope Science Institute (United States)
Hugues Sana, Space Telescope Science Institute (United States)
Paule Sonnentrucker, Space Telescope Science Institute (United States)
Joanna Taylor, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9601:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX
Oswald H. Siegmund, Editor(s)

© SPIE. Terms of Use
Back to Top