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The Calibration and Data Products of GALEX

Open access
Morrissey, Patrick, Conrow, Tim, Barlow, Tom A., Small, Todd, Seibert, Mark, Wyder, Ted K., Budavari, Tamas, Arnouts, Stephane, Friedman, Peter G., Forster, Karl, Martin, D. Christopher, Neff, Susan G., Schiminovich, David, Bianchi, Luciana, Donas, Jose, Heckman, Timothy M., Lee, Young‐Wook, Madore, Barry F., Milliard, Bruno, Rich, R. Michael, Szalay, Alex S., Welsh, Barry Y., Yi, Sukyoung K.·2007·The Astrophysical Journal Supplement Series

Abstract

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.

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Metadata

Authors
Morrissey, P., Conrow, T., Barlow, T. A., Small, T., Seibert, M., Wyder, T. K., Budavari, T., Arnouts, S., Friedman, P. G., Forster, K., Martin, D. C., Neff, S. G., Schiminovich, D., Bianchi, L., Donas, J., Heckman, T. M., Lee, Y., Madore, B. F., Milliard, B., Rich, R. M., Szalay, A. S., Welsh, B. Y., & Yi, S. K.
Venue
The Astrophysical Journal Supplement Series
Published
2007-12
Volume
173
Issue
2
Pages
682-697
ISSN
  • 0067-0049 (ISSN-L)
  • 1538-4365
OpenAlex
W2090231561
Cited by
1,117
References
11
FWCI
50.18
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: The Calibration and Data Products of GALEX. https://app.cochat.ai/papers/10.1086/520512
The paper
Morrissey, P., Conrow, T., Barlow, T. A., Small, T., Seibert, M., Wyder, T. K., Budavari, T., Arnouts, S., Friedman, P. G., Forster, K., Martin, D. C., Neff, S. G., Schiminovich, D., Bianchi, L., Donas, J., Heckman, T. M., Lee, Y., Madore, B. F., Milliard, B., . . . Yi, S. K. (2007). The Calibration and Data Products of GALEX. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/520512

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