Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543509c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #435.09; Bulletin of the American Astronomical Society, Vol. 42, p.380
Astronomy and Astrophysics
Astronomy
Scientific paper
Disentangling active galactic nuclei emission from star formation activity is a key step in understanding galaxy formation and evolution. Recently, a successful approach to separate AGN from SF dominated galaxies has been to work with multi-wavelength observations (V.Smolcic et al. 2008), mainly optical, infrared, ultraviolet, and radio. A main issue, however, in discerning the two populations is the existence of low luminosity AGN's, which prove to be particularly confounded with star formation regions, seeing as their observed radio fluxes are relatively small. By stacking radio selected sources in X-ray images from the Chandra Lockman Area North Survey (CLANS), we attempt to probe SF and AGN dominated galaxies at high redshifts, allowing for very faint signals to be extracted and analyzed. To avoid bias, multiple stacks of images were created given redshift bins (0.3 < z < 1.3) and SED classification from the radio catalog, and then compared to stacks of random background regions created using the same routine. We discuss preliminary results of the X-ray stacking. Furthermore, we present derived column densities for obscured AGN's and star formation rates for stacks of galaxies. This research was made possible through the National Radio Astronomy Observatory REU Program in Socorro, NM and the National Science Foundation.
Cardoso Rogerio Fernando
Pannella Maurilio
Strazzullo Veronica
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