Hidden Quasars in Ultraluminous Infrared Galaxies

Details Hidden Quasars in Ultraluminous Infrared Galaxies Hidden Quasars in Ultraluminous Infrared Galaxies

1998-11-20

arxiv.org/abs/astro-ph/9811322v1

Astronomy and Astrophysics

Astrophysics

2 pages including 2 postscript figures to be published in the proceedings of the IAU Symposium No. 194: "Activity in Galaxies

Scientific paper

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
(f_{25}/f_{60} >~ 0.25).

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