2009ApJ...691L..33K -
Astrophys. J., 691, L33-L36 (2009/January-3)
Overdensities of galaxies at z ∼ 3.7 in Chandra deep field-south.
KANG E. and IM M.
Abstract (from CDS):
We report the discovery of possible overdensities of galaxies at z ∼ 3.7 in Chandra Deep Field-South (CDF-S). These overdensities are identified from a photometric redshift-selected sample and a BVz-selected sample. One overdensity is identified in the proximity of two active galactic nuclei and Lyman break galaxies at z = 3.66 and z = 3.70 at 7σ significance level. The other overdensity is less significant. It is identified around six zspec≃ 3.6 galaxies at 3σ significance level. The line-of-sight velocity dispersions of these overdensities are found to be σv ≃ 500-800 km/s, comparable to the velocity dispersions of clusters of galaxies today. Through spectral energy distribution fitting, we find ∼15 massive galaxies with M ≳ 1011 M☉ around the z ≃ 3.7 overdensity. The mass of the z ≃ 3.7 overdensity is found to be a few x1014 M☉. Our result suggests that high-redshift overdense regions can be found in a supposedly blank field, and that the emergence of massive structures can be traced back to redshifts as high as z ∼ 3.7.
Abstract Copyright:
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Journal keyword(s):
cosmology: observations - galaxies: clusters: general - galaxies: evolution - galaxies: high-redshift
Simbad objects:
2
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