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Hidden Quasars in Ultraluminous Infrared Galaxies

Published online by Cambridge University Press:  25 May 2016

H. D. Tran ,
M. S. Brotherton ,
S. A. Stanford  and
W. van Breugel
H. D. Tran
Affiliation:
Institute of Geophysics & Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550
M. S. Brotherton
Affiliation:
Institute of Geophysics & Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550
S. A. Stanford
Affiliation:
Institute of Geophysics & Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550
W. van Breugel
Affiliation:
Institute of Geophysics & Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550

Abstract

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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]λ5007/Hβ ≳ 5), and “warm” IR color (f25/f60 ≳ 0.25).

Type
II. Observational Properties of AGN and Related Objects
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 181 - 183
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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