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Spectroscopic Identification of a Proto-Cluster at z=2.300: Environmental Dependence of Galaxy Properties at High Redshift | | Charles C. Steidel
; Kurt L. Adelberger
; Alice E. Shapley
; Dawn K. Erb
; Naveen A. Reddy
; Max Pettini
; | | Date: |
21 Feb 2005 | | Journal: | Astrophys.J. 626 (2005) 44-50 | | Subject: | astro-ph | | Affiliation: | Caltech), Kurt L. Adelberger (OCIW), Alice E. Shapley (UC Berkeley), Dawn K. Erb (Caltech), Naveen A. Reddy (Caltech) and Max Pettini (IoA | | Abstract: | We have discovered a highly significant over-density 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 HS1700+643. The structure has a redshift-space galaxy over-density of delta_g,z ~= 7 and an estimated matter over-density in real space of delta_m ~= 1.8, indicating that it will virialize by z~0 with a mass scale of ~= 1.4x10^15 M_sun, that of a rich galaxy cluster. Detailed modeling of the spectral energy distribution -- from the rest-far-UV to the rest-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 proto-cluster environment have mean stellar masses and inferred ages that are ~2 times larger (at z=2.30) than identically UV-selected galaxies outside of the structure, and show that this is consistent with simple theoretical expectations for the acceleration of structure formation in a region that is over-dense on large scales by the observed amount. The proto-cluster environment contains a significant number of galaxies that already appear old, with large stellar masses (>10^11 M_sun), by z=2.3. | | Source: | arXiv, astro-ph/0502432 | | Services: | Forum | Review | PDF | Favorites | |
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