The GALEX ultraviolet atlas of nearby galaxies



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Gil de Paz, Armando and otros, ... (2007) The GALEX ultraviolet atlas of nearby galaxies. Astrophysical journal supplement series, 173 (2). pp. 185-255. ISSN 0067-0049

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We present images, integrated photometry, and surface-brightness and color profiles for a total of 1034 nearby galaxies recently observed by the Galaxy Evolution Explorer (GALEX) satellite in its far-ultraviolet (FUV; λ_eff = 1516 Å) and near-ultraviolet (NUV; λ_eff = 2267 Å) bands. Our catalog of objects is derived primarily from the GALEX Nearby Galaxies Survey (NGS) supplemented by galaxies larger than 1' in diameter serendipitously found in these fields and in other GALEX exposures of similar of greater depth. The sample analyzed here adequately describes the distribution and full range of properties (luminosity, color, star formation rate [SFR]) of galaxies in the local universe. From the surface brightness profiles obtained we have computed asymptotic magnitudes, colors, and luminosities, along with the concentration indices C31 and C42. We have also morphologically classified the UV surface brightness profiles according to their shape. This data set has been complemented with archival optical, near-infrared, and far-infrared fluxes and colors. We find that the integrated (FUV − K) color provides robust discrimination between elliptical and spiral/irregular galaxies and also among spiral galaxies of different subtypes. Elliptical galaxies with brighter K-band luminosities (i.e., more massive) are redder in (NUV − K) color but bluer in (FUV − NUV) (a color sensitive to the presence of a strong UV upturn) than less massive ellipticals. In the case of the spiral/irregular galaxies our analysis shows the presence of a relatively tight correlation between the (FUV − NUV) color (or, equivalently, the slope of the UV spectrum, β) and the total infrared-to-UV ratio. The correlation found between (FUV − NUV) color and K-band luminosity (with lower luminosity objects being bluer than more luminous ones) can be explained as due to an increase in the dust content with galaxy luminosity. The images in this Atlas along with the profiles and integrated properties are publicly available through a dedicated Web page.

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© 2007. The American Astronomical Society. All rights reserved. Artículo firmado por 26 autores. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in April 2003. 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. AGdP is partially financed by the MAGPOP EU Marie Curie Research Training Network and the Spanish Programa Nacional de Astronomía y Astrofísica under grant AYA2003-01676. We thank Cren Frayer and Olga Pevunova for preparing the online version of the Atlas. We are also thankful to the referee for his/her valuable comments which helped to improve the paper.

Uncontrolled Keywords:Hubble-space-telescope; Compact dwarf galaxies; Star-formation history; Extragalactic distance scale; Campanas imaging atlas; Small-magellanic-cloud; Canes venatici cloud; R-surface photometry; Giant branch stars; Evolution-explorer
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35643
Deposited On:11 Feb 2016 16:46
Last Modified:10 Dec 2018 15:05

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