Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922502g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #225.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Galaxy properties (i.e., luminosity, color, morphology, star-formation history) are known to evolve strongly with time. The redshift z 0.5-1.5 is believed to be a crucial epoch: (1) galaxies are evolving strongly as a function of stellar mass; (2) AGN activity is prevalent; (3) massive clusters are forming and (4) the red sequence is becoming established. To unambiguously determine the dominant physical processes which are driving the growth and evolution of galaxies and their central black holes at z 1 requires sensitive multi-wavelength wide-field surveys. We have combined the AGN identified in sensitive Chandra ACIS-I X-ray imaging ( 3200 sources; Goulding et al. 2011b), Spitzer IRAC infrared photometry ( 4800 sources), and FIRST and NVSS radio data ( 700 sources) with the Keck/DEIMOS catalog of 49,600 optical spectroscopic galaxies in the combined 3.2 deg2 DEEP2 fields. Using this extensive suite of multi-wavelength data, we have identified 2100 DEEP2 galaxies at z 0.8-1.4, which have signatures of X-ray, IR and/or radio-bright AGN. By comparing the properties of AGN in DEEP2 at z 0.8-1.4 to those of AGN in BOOTES at z 0.3-0.8 (Hickox et al. 2009), we place new direct wavelength-independent constraints on the evolution of AGN hosts. We find that whilst there is clear evidence for mass/luminosity downsizing from z 1 to the present day, there appears to be no evolution in color or morphology at this epoch, regardless of AGN accretion mode. However, from X-ray stacking analyses of IR AGN and star-forming galaxies, we find strong evidence for a large population of gas-rich (star-forming) obscured AGN which are formally undetected in the deep X-ray imaging. Taken together, this provides further indication that dust/gas rich systems may play a crucial role in galaxy evolution and the build-up of the red-sequence.
DEEP2 survey Team
Goulding Andy D.
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