THE DEAD SEQUENCE: A CLEAR BIMODALITY IN GALAXY COLORS FROM z=0 to z=2.5

被引:208
作者
Brammer, G. B. [1 ]
Whitaker, K. E. [1 ]
van Dokkum, P. G. [1 ]
Marchesini, D. [1 ,2 ]
Labbe, I. [3 ]
Franx, M. [4 ]
Kriek, M. [5 ]
Quadri, R. F. [4 ]
Illingworth, G. [6 ]
Lee, K. -S. [1 ]
Muzzin, A. [1 ]
Rudnick, G. [7 ]
机构
[1] Yale Univ, Dept Astron, New Haven, CT 06520 USA
[2] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA
[3] Carnegie Observ, Pasadena, CA 91101 USA
[4] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
[5] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[6] Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
[7] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
来源
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 706卷 / 01期
基金
美国国家科学基金会;
关键词
cosmology: observations; galaxies: evolution; galaxies: formation; GMASS ULTRADEEP SPECTROSCOPY; STAR-FORMING GALAXIES; DEEP-FIELD-SOUTH; SIMILAR-TO; RED SEQUENCE; LUMINOSITY FUNCTION; STELLAR MASSES; MULTIWAVELENGTH SURVEY; QUIESCENT GALAXIES; MAGNITUDE DIAGRAM;
D O I
10.1088/0004-637X/706/1/L173
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We select 25,000 galaxies from the NEWFIRM Medium Band Survey (NMBS) to study the rest-frame U-V color distribution of galaxies at 0 < z less than or similar to 2.5. The five unique NIR filters of the NMBS enable the precise measurement of photometric redshifts and rest-frame colors for 9900 galaxies at 1 < z < 2.5. The rest-frame U-V color distribution at all z less than or similar to 2.5 is bimodal, with a red peak, a blue peak, and a population of galaxies in between (the green valley). Model fits to the optical-NIR spectral energy distributions and the distribution of MIPS-detected galaxies indicate that the colors of galaxies in the green valley are determined largely by the amount of reddening by dust. This result does not support the simplest interpretation of green valley objects as a transition from blue star forming to red quiescent galaxies. We show that correcting the rest-frame colors for dust reddening allows a remarkably clean separation between the red and blue sequences up to z similar to 2.5. Our study confirms that dusty-starburst galaxies can contribute a significant fraction to red-sequence samples selected on the basis of a single rest-frame color (i.e., U-V), so extra care must be taken if samples of truly "red and dead" galaxies are desired. Interestingly, of galaxies detected at 24 mu m, 14% remain on the red sequence after applying the reddening correction.
引用
收藏
页码:L173 / L177
页数:5
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