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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
GALEX observations of low surface brightness galaxies: UV color and star formation efficiency
Astrophysical Journal, Volume 681, No. 1, Year 2008
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Description
We present GALEX UVobservations of a sample of low surface brightness ( LSB) galaxies for which H i data are available, allowing us to estimate their star formation efficiency. We find that the UV light extends to larger radii than the optical light (some galaxies, but not all, look similar to the recently discovered XUV-disk galaxies). Using a standard calibration to convert the UV light into star formation rates, we obtain lower star formation efficiencies in LSB galaxies than in high surface brightness galaxies by about one order of magnitude. We show, however, that standard calibrations may not apply to these galaxies, as the FUV-NUV color obtained from the two GALEX bands ( FUV and NUV; λeff = 1516 and 2267 Å, respectively) is redder than expected for star-forming galaxies. This color can be interpreted as a result of internal extinction, modified initial mass function, or star formation histories characterized by bursts followed by quiescent phases. Our analysis favors this latter hypothesis. © 2008. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Boissier, Samuel
France, Marseille
Laboratoire D'astrophysique de Marseille
France, Paris
Cnrs Centre National de la Recherche Scientifique
Gil De Paz, A. Gll
Spain, Madrid
Universidad Complutense de Madrid
Boselli, Alessandro
France, Marseille
Laboratoire D'astrophysique de Marseille
France, Paris
Cnrs Centre National de la Recherche Scientifique
Buat, Véronique
France, Marseille
Laboratoire D'astrophysique de Marseille
Madore, Barry F.
United States, Pasadena
Carnegie Observatories
Chemin, Laurent
France, Paris
L'observatoire de Paris
Balkowski, Chantal
France, Paris
L'observatoire de Paris
Amram, Phillippe
France, Marseille
Laboratoire D'astrophysique de Marseille
Carignan, Claude
Canada, Montreal
University of Montreal
van Driel, Willem
France, Paris
L'observatoire de Paris
Statistics
Citations: 72
Authors: 10
Affiliations: 6
Identifiers
Doi:
10.1086/588580
ISSN:
0004637X