Spectroscopic identification of a protocluster at z=2.300:: Environmental dependence of galaxy properties at high redshift

被引:181
作者
Steidel, CC
Adelberger, KL
Shapley, AE
Erb, DK
Reddy, NA
Pettini, M
机构
[1] CALTECH, Pasadena, CA 91125 USA
[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[4] Astron Inst, Cambridge CB3 0HA, England
关键词
cosmology : observations; galaxies : clusters : general; galaxies : evolution; galaxies : high-redshift;
D O I
10.1086/429989
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have discovered a highly significant overdensity of galaxies at z = 2.300 +/- 0.015 in the course of a redshift survey designed to select star-forming galaxies in the redshift range z = 2.3 +/- 0.4 in the field of the bright z = 2.72 QSO HS 1700+643. The structure has a redshift-space galaxy overdensity of delta(z)(g)similar or equal to 7 and an estimated matter overdensity in real space of delta(m) similar or equal to 1.8, indicating that it will virialize by z similar to 0 with a mass scale of similar or equal to 1.4; 10(15) M-circle dot, that of a rich galaxy cluster. Detailed modeling of the spectral energy distribution - from the rest-frame far-UV to the rest-frame near-IR-of the 72 spectroscopically confirmed galaxies in this field for which we have obtained K-s and Spitzer IRAC photometry allows for a first direct comparison of galaxy properties as a function of large-scale environment at high redshift. We find that galaxies in the protocluster environment have mean stellar masses and inferred ages that are similar to 2 times larger (at z = 2.30) than identically UV-selected galaxies outside of the structure, and we show that this is consistent with simple theoretical expectations for the acceleration of structure formation in a region that is overdense on large scales by the observed amount. The protocluster environment contains a significant number of galaxies that already appear old, with large stellar masses (> 10(11) M-circle dot), by z = 2.3.
引用
收藏
页码:44 / 50
页数:7
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