The UV-optical galaxy color-magnitude diagram.: I.: Basic properties

被引：371

作者：

Wyder, Ted K. ^{[1
]}

Martin, D. Christopher ^{[1
]}

Schiminovich, David ^{[2
]}

Seibert, Mark

Budavari, Tamas ^{[4
]}

Treyer, Marie A. ^{[1
,5
]}

Barlow, Tom A. ^{[1
]}

Forster, Karl ^{[1
]}

Friedman, Peter G. ^{[1
]}

Morrissey, Patrick ^{[1
]}

Neff, Susan G. ^{[6
]}

Small, Todd ^{[1
]}

Bianchi, Luciana ^{[4
]}

Donas, Jose ^{[5
]}

Heckman, Timothy M. ^{[7
]}

Lee, Young-Wook ^{[8
]}

Madore, Barry F. ^{[3
]}

Milliard, Bruno ^{[5
]}

Rich, R. Michael ^{[9
]}

Szalay, Alex S. ^{[7
]}

Welsh, Barry Y. ^{[10
]}

Yi, Sukyoung K. ^{[8
]}

机构：

[1] CALTECH, Pasadena, CA 91125 USA

[2] Columbia Univ, Dept Astron, New York, NY 10027 USA

[3] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[4] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA

[5] Lab Astrophys Marseille, F-13376 Marseille, France

[6] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA

[7] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[8] Yonsei Univ, Ctr Space Astrophy, Seoul 120749, South Korea

[9] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[10] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2007年 / 173卷 / 02期

关键词：

galaxies : evolution; galaxies : fundamental parameters; galaxies : luminosity function; mass function; galaxies : statistics; ultraviolet : galaxies;

D O I：

10.1086/521402

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have analyzed the bivariate distribution of galaxies as a function of ultraviolet-optical colors and absolute magnitudes in the local universe. The sample consists of galaxies with redshifts and optical photometry from the Sloan Digital Sky Survey (SDSS) main galaxy sample matched with detections in the near-ultraviolet (NUV) and far-ultraviolet (FUV) bands in the Medium Imaging Survey being carried out by the Galaxy Evolution Explorer (GALEX) satellite. In the (NUV-r)(0.1) versus M-r,M-0.1 galaxy color-magnitude diagram, the galaxies separate into two well-defined blue and red sequences. The (NUV-r)(0.1) color distribution at each M-r,M-0.1 is not well fit by the sum of two Gaussians due to an excess of galaxies in between the two sequences. The peaks of both sequences become redder with increasing luminosity, with a distinct blue peak visible up to M-r,M-0.1 similar to -23. The r(0.1)-band luminosity functions vary systematically with color, with the faint-end slope and characteristic luminosity gradually increasing with color. After correcting for attenuation due to dust, we find that approximately one-quarter of the color variation along the blue sequence is due to dust, with the remainder due to star formation history and metallicity. Finally, we present the distribution of galaxies as a function of specific star formation rate and stellar mass. The specific star formation rates imply that galaxies along the blue sequence progress from low-mass galaxies with star formation rates that increase somewhat with time to more massive galaxies with a more or less constant star formation rate. Above a stellar mass of similar to 10(10.5) M-circle dot, galaxies with low ratios of current to past averaged star formation rate begin to dominate.

引用

页码：293 / 314

页数：22

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