Computer Science
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sacm.confe..27s&link_type=abstract
The Starburst-AGN Connection under the Multiwavelength Limelight, held 14-16 September 2011. Published online at http://www.scio
Computer Science
Scientific paper
It has long been proposed that AGN and starburst activity follow connected evolutionary paths, resulting in the observed black hole-bulge relationship and driving theoretical models to adopt a scenario of complex feedback processes. Although it is difficult to directly observe such processes, we believe that the ideal laboratories for studying the starburst/AGN connection are dusty, infrared-luminous galaxies, whose energetic output from intense starburst episodes is often combined with emission from powerful AGN. I would like to present the recent advances we have made regarding this topic, using a sample of Spitzer far-IR selected luminous and ultra-luminous infrared galaxies (LIRGs and ULIRGs, L_IR > 10^{11}L_Sun) at z>1. With the aid of X-ray Chandra data (<10keV), we identify AGN in a significant fraction of the sample, however, we find that the AGN is far from responsible for powering the galaxy and in most cases contributes less than 10% to total energy budget. We go further to examine the sample's properties in reference to the optical colour-magnitude diagram (CMD), and find that LIRGs and ULIRGs occupy the optically bright/high mass end, with colours that span a large range and peak in the green vllley. However, we notice that their location on the CMD is in contrast to the evidence for young stellar populations reveaed in their optical spectra and we show that it is in fact entirely a consequence of dust extinction. We also note that the AGN predominantly live in the galaxies with the highest masses and star-formation rates, which are in the right part of the CMD to evolve into the ellipticals that occupy the massive end of the red sequence. During my talk, I will put these results in context and discuss their implications for AGN feedback as a plausible player in galaxy evolution.
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