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The ultraviolet view of the Magellanic Clouds from GALEX: A first look at the LMC source catalog

Simons, Raymond and Thilker, David and Bianchi, Luciana and Wyder, Ted (2014) The ultraviolet view of the Magellanic Clouds from GALEX: A first look at the LMC source catalog. Advances in Space Research, 53 (6). pp. 939-949. ISSN 0273-1177.

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The Galaxy Evolution Exporer (GALEX) has performed unprecedented imaging surveys of the Magellanic Clouds (MC) and their surrounding areas including the Magellanic Bridge (MB) in near-UV (NUV, 1771-2831 Å) and far-UV (FUV, 1344-1786 Å) bands at 5″ resolution. Substantially more area was covered in the NUV than FUV, particularly in the bright central regions, because of the GALEX FUV detector failure. The 5σ depth of the NUV imaging varies between 20.8 and 22.7 (ABmag). Such imaging provides the first sensitive view of the entire content of hot stars in the Magellanic System, revealing the presence of young populations even in sites with extremely low star-formation rate surface density like the MB, owing to high sensitivity of the UV data to hot stars and the dark sky at these wavelengths. The density of UV sources is quite high in many areas of the LMC and SMC. Crowding limits the quality of source detection and photometry from the standard mission pipeline processing. We performed custom-photometry of the GALEX data in the MC survey region (<15° from the LMC, <10° from the SMC). After merging multiple detections of sources in overlapping images, the resulting catalog we have produced for the LMC contains nearly six million unique NUV point sources within 15° and is briefly presented herein. This paper provides a first look at the GALEX MC survey and highlights some of the science investigations that the entire catalog and imaging dataset will make possible.

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Additional Information:© 2013 COSPAR. Published by Elsevier Ltd. Available online 24 July 2013. We are grateful to the GALEX “Science Operation and Data Analysis Team” for their years of hard work and devotion which led to such a successful survey mission. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. In particular, the CDS XMatch service was very helpful. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
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Subject Keywords:Ultraviolet: surveys; Astronomical data bases: catalogs; Galaxies: Magellanic Clouds; Ultraviolet: galaxies
Issue or Number:6
Record Number:CaltechAUTHORS:20140612-094154014
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Official Citation:Raymond Simons, David Thilker, Luciana Bianchi, Ted Wyder, The ultraviolet view of the Magellanic Clouds from GALEX: A first look at the LMC source catalog, Advances in Space Research, Volume 53, Issue 6, 15 March 2014, Pages 939-949, ISSN 0273-1177, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46230
Deposited By: Ruth Sustaita
Deposited On:12 Jun 2014 17:20
Last Modified:03 Oct 2019 06:42

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