Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823803g&link_type=abstract
American Astronomical Society, AAS Meeting #218, #238.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
High-quality optical spectroscopic redshift surveys are essential to enable us to fully understand the evolution of galaxies and AGN throughout cosmic history. Galaxy properties (i.e., luminosity, color, morphology, star-formation history) and AGN activity are shown to evolve strongly with time. The redshift z 1 is a crucial epoch: (1) galaxies are evolving strongly as a function of stellar mass; (2) AGN activity is extremely prevalent; (3) massive clusters are forming and (4) the red sequence is becoming established. To unambiguously determine the dominant physical processes that are driving the growth and evolution of galaxies and their central black holes at z 1 requires sensitive, wide-field multi-wavelength surveys. Following the analyses of Hickox et al. (2009), we present new results from a study combining Keck/DEIMOS optical spectroscopy, Chandra ACIS-I X-ray imaging, FIRST and NVSS radio data, and Spitzer IRAC infrared imaging available in the 6 deg^2 DEEP2 redshift survey regions. Using the extensive suite of multi-wavelength data, and through further spectroscopic follow-up using MMT/Hectospec, we have identified 2500 of the 20,000 DEEP2 galaxies at z 0.7--1.5 that have signatures of X-ray, IR or radio-bright AGN. Using this relatively large sample, we place new direct obscuration-independent constraints on the populations of AGN at z 1 and their host-galaxy properties, and subsequently use these results to further investigate the role of large-scale environment on galaxy evolution.
DEEP2 survey Team
Goulding Andy
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