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The Calibration and Data Products of GALEX

Morrissey, Patrick and Conrow, Tim and Barlow, Tom A. and Small, Todd and Seibert, Mark and Wyder, Ted K. and Budavári, Tamás and Arnouts, Stephane and Friedman, Peter G. and Forster, Karl and Martin, D. Christopher and Neff, Susan G. and Schiminovich, David and Bianchi, Luciana and Donas, José and Heckman, Timothy M. and Lee, Young-Wook and Madore, Barry F. and Milliard, Bruno and Rich, R. Michael and Szalay, Alex S. and Welsh, Barry Y. and Yi, Sukyoung K. (2007) The Calibration and Data Products of GALEX. Astrophysical Journal Supplement Series, 173 (2). pp. 682-697. ISSN 0067-0049.

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We describe the calibration status and data products pertaining to the GR2 and GR3 data releases of the Galaxy Evolution Explorer (GALEX). These releases have identical pipeline calibrations that are significantly improved over the GR1 data release. GALEX continues to survey the sky in the far-ultraviolet (FUV, ~154 nm) and near-ultraviolet (NUV, ~232 nm) bands, providing simultaneous imaging with a pair of photon-counting, microchannel plate, delay line readout detectors. These 1.25° field of view detectors are well suited to ultraviolet observations because of their excellent red rejection and negligible background. A dithered mode of observing and photon list output pose complex requirements on the data processing pipeline, entangling detector calibrations, and aspect reconstruction algorithms. Recent improvements have achieved photometric repeatability of 0.05 and 0.03 m_(AB) in the FUV and NUV, respectively. We have detected a long-term drift of order 1% FUV and 6% NUV over the mission. Astrometric precision is of order 0.5" rms in both bands. In this paper we provide the GALEX user with a broad overview of the calibration issues likely to be confronted in the current release. Improvements are likely as the GALEX mission continues into an extended phase with a healthy instrument, no consumables, and increased opportunities for guest investigations.

Item Type:Article
Related URLs:
URLURL TypeDescription
Morrissey, Patrick0000-0001-8177-1023
Seibert, Mark0000-0002-1143-5515
Forster, Karl0000-0001-5800-5531
Martin, D. Christopher0000-0002-8650-1644
Madore, Barry F.0000-0002-1576-1676
Rich, R. Michael0000-0003-0427-8387
Additional Information:© 2007 The American Astronomical Society. Received 2006 December 8; accepted 2007 May 16. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Facilities: GALEX
Group:Space Radiation Laboratory, Space Astrophysics Laboratory
Subject Keywords:space vehicles; surveys; telescopes; ultraviolet : general
Issue or Number:2
Record Number:CaltechAUTHORS:20091118-092117490
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Official Citation:The Calibration and Data Products of GALEX Patrick Morrissey, Tim Conrow, Tom A. Barlow, Todd Small, Mark Seibert, Ted K. Wyder, Tamás Budavári, Stephane Arnouts, Peter G. Friedman, Karl Forster, D. Christopher Martin, Susan G. Neff, David Schiminovich, Luciana Bianchi, José Donas, Timothy M. Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, R. Michael Rich, Alex S. Szalay, Barry Y. Welsh, and Sukyoung K. Yi 2007 ApJS 173 682-697 doi: 10.1086/520512
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16739
Deposited By: Tony Diaz
Deposited On:25 Nov 2009 22:19
Last Modified:09 Mar 2020 21:02

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