From Merging Galaxies to Quasars: the Evolution of Nuclear Activity in Luminous and Ultraluminous Infrared Galaxies

Astronomy and Astrophysics – Astronomy

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Scientific paper

Galaxy merging is a key driving force of galaxy evolution. It has been proposed that U/LIRGs evolve into quasars where these mergers first go through a luminous starburst phase, followed by a dust-enshrouded AGN phase, and finally evolve into optically bright "naked" quasars. We present the results of a large X-ray survey of about 60 U/LIRGs and 26 PG quasars observed by Chandra, XMM-Newton, and Suzaku. The global X-ray properties of these two classes of objects will be discussed. By comparing the X-ray results with those obtained by HST and Spitzer, we will also explore whether there is an evolutionary connection between U/LIRGs and quasars.

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