The color-magnitude distribution of field galaxies to z ∼ 3:: The evolution and modeling of the blue sequence

被引:42
作者
Labbe, Ivo [1 ]
Franx, Marijn
Rudnick, Gregory
Schreiber, Natascha M. Foerster
van Dokkum, Pieter G.
Moorwood, Alan
Rix, Hans-Walter
Roettgering, Huub
Trujillo, Ignacio
van der Werf, Paul
机构
[1] Carnegie Observ, Pasadena, CA 91101 USA
[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
[3] Natl Opt Astron Observ, Tucson, AZ 85719 USA
[4] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[5] Yale Univ, Dept Astron, New Haven, CT 06520 USA
[6] European So Observ, D-85748 Garching, Germany
[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany
关键词
galaxies : evolution; galaxies : high-redshift; infrared : galaxies;
D O I
10.1086/519436
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using deep NIRVLT ISAAC and optical HSTWFPC2 imaging in the HDF-S and MS 1054-03, we study the rest-frame UV-to-optical colors and magnitudes of galaxies to z similar to 3. Unlike the present day, there is no evidence for a red sequence at z similar to 3, but there does appear to be a well-defined CMR for blue galaxies at all redshifts, with more luminous galaxies having redderU - V colors. The slope of the blue CMR is independent of redshift delta(U - V)/delta M-V = 0.09 +/- 0.01 and can be explained by a correlation of dust reddening with luminosity. The average color at fixed luminosity reddens strongly delta(U - V) approximate to 0: 75 from z similar to 3 to z = 0, much of which can be attributed to aging of stars. The color scatter of the blue sequence is relatively small delta(U - V) 0.25 +/- 0.03 and constant to z similar to 3, but notably asymmetrical, having a sharp blue ridge and a wing toward redder colors. We explore sets of SFHs to study the constraints placed by the shape of the scatter at z = 2-3. One particular set of models, episodic star formation, reproduces the detailed properties very well. For a two-state model with high and low star formation, the duty cycle is constrained to be > 40% and the contrast in SFR between the states must be a factor > 5 [ or a scatter in log ( SFR) of > 0.35 dex around the mean]. Nevertheless, episodicmodels do not explain the observed tail of very red galaxies, primarily DRGs, which may have ceased star formation altogether or are more heavily obscured. Finally, the relative number density of red, luminous M-V < -20.5 galaxies increases by a factor of similar to 6 from z = 2.7 to 0.5, as does their contribution to the total rest-frame V-band luminosity density. We are likely viewing the progressive formation of red, passively evolving galaxies.
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收藏
页码:944 / 972
页数:29
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