A multi-wavelength approach to the properties of Extremely Red Galaxy populations: I - Contribution to the Star Formation Rate density and AGN content - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




A multi-wavelength approach to the properties of Extremely Red Galaxy populations: I - Contribution to the Star Formation Rate density and AGN content - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present a multi-wavelength analysis of the properties of Extremely RedGalaxy ERG populations, selected in the GOODS-South-Chandra Deep Field Southfield. By using all the photometric and spectroscopic information available onlarge deep samples of EROs 645 sources, IEROs 294 sources, and DRGs 350sources, we derive redshift distributions, identify AGN powered andStar-formation powered galaxies, and, using the radio observations of thisfield, estimate robust AGN- and dust-unbiased Star Formation Rate DensitiesSFRD for these populations. We also investigate the properties of -pure-galaxies that conform to only one of the three ERG criteria considered and-combined- galaxies that verify all three criteria sub-populations. Overall,a large number of AGN are identified up to ~30%, based on X-rays, andmid-infrared criteria, the majority of which are type-2 obscured objects.Among ERGs with no evidence for AGN activity, we identify sub-populationscovering a wide range of average star-formation rates, from below 10 Mo-yr toas high as 200 Mo-yr. Applying a redshift separation 1


Author: Hugo Messias, Jose Afonso, Andrew Hopkins, Bahram Mobasher, Tania Dominici, David M. Alexander

Source: https://arxiv.org/







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