Hidden Quasars in Ultraluminous Infrared Galaxies
H. D. Tran, M. S. Brotherton, S. A. Stanford, W. van Breugel
Abstract
Many ultraluminous infrared galaxies (ULIRGs) are powered by quasars hidden in the center, but many are also powered by starbursts. A simply diagnostic diagram is proposed that can identify obscured quasars in ULIRGs by their high-ionization emission lines ([O III] 5007/Hbeta >~ 5), and ``warm'' IR color (f25/f60 >~ 0.25).
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