Galaxy Evolution Explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies

被引:274
作者
Yi, SK
Yoon, SJ
Kaviraj, S
Deharveng, JM
Rich, RM
Salim, S
Boselli, A
Lee, YW
Ree, CH
Sohn, YJ
Rey, SC
Lee, JW
Rhee, J
Bianchi, L
Byun, YI
Donas, J
Friedman, PG
Heckman, TM
Jelinsky, P
Madore, BF
Malina, R
Martin, DC
Milliard, B
Morrissey, P
Neff, S
Schiminovich, D
Siegmund, O
Small, T
Szalay, AS
Jee, MJ
Kim, SW
Barlow, T
Forster, K
Welsh, B
Wyder, TK
机构
[1] Yonsei Univ, Ctr Space Astrophys, Seoul 120749, South Korea
[2] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[3] Lab Astrophys Marseille, F-13376 Marseille, France
[4] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[5] CALTECH, Pasadena, CA 91125 USA
[6] Chungnam Natl Univ, Dept Astron & Space Sci, Taejon 305764, South Korea
[7] Sejong Univ, Dept Astron & Space Sci, Seoul 143747, South Korea
[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[9] Univ Calif Berkeley, Space Sci Lab, Expt Astrophys Grp, Berkeley, CA 94720 USA
[10] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[11] CALTECH, NASA, IPAC Extragalact Database, Pasadena, CA 91125 USA
[12] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA
[13] Columbia Univ, Dept Astron, New York, NY 10027 USA
关键词
galaxies : evolution; galaxies : formation; ultraviolet : galaxies;
D O I
10.1086/422811
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have used the Galaxy Evolution Explorer UV photometric data to construct a first near-UV (NUV) color-magnitude relation (CMR) for the galaxies preclassified as early-type by Sloan Digital Sky Survey studies. The NUV CMR is a powerful tool for tracking the recent star formation history in early-type galaxies, owing to its high sensitivity to the presence of young stellar populations. Our NUV CMR for UV-weak galaxies shows a well-defined slope and thus will be useful for interpreting the rest-frame NUV data of distant galaxies and studying their star formation history. Compared to optical CMRs, the NUV CMR shows a substantially larger scatter, which we interpret as evidence of recent star formation activities. Roughly 15% of the recent epoch (z < 0.13) bright [M(r) < -22] early-type galaxies show a sign of recent (less than or similar to1 Gyr) star formation at the 1%-2% level (lower limit) in mass compared to the total stellar mass. This implies that low-level residual star formation was common during the last few billion years even in bright early-type galaxies.
引用
收藏
页码:L111 / L114
页数:4
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