GALEX observations of low surface brightness galaxies:: UV color and star formation efficiency

被引:84
作者
Boissier, S. [1 ,2 ]
de Paz, A. Gil [3 ]
Boselli, A. [1 ,2 ]
Buat, V. [1 ]
Madore, B. [4 ]
Chemin, L. [5 ,6 ]
Balkowski, C. [5 ,6 ]
Amram, P. [1 ]
Carignan, C. [7 ]
van Driel, W. [5 ,6 ]
机构
[1] Astrophys Lab, F-13388 Marseille 13, France
[2] CNRS, UMR 6110, F-75700 Paris, France
[3] Univ Complutense Madrid, Dept Astrofis & CC Atmosfera, E-28040 Madrid, Spain
[4] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[5] CNRS, GEPI, Observ Paris, F-92195 Meudon, France
[6] Univ Paris 07, F-92195 Meudon, France
[7] Univ Montreal, Montreal, PQ H3C 3J7, Canada
关键词
galaxies : dwarf; galaxies : irregular; galaxies : spiral; ultraviolet : galaxies;
D O I
10.1086/588580
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present GALEX UV observations 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; lambda(eff) = 1516 and 2267 angstrom, 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.
引用
收藏
页码:244 / 257
页数:14
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