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arxiv: astro-ph/9811322 · v1 · submitted 1998-11-20 · 🌌 astro-ph

Hidden Quasars in Ultraluminous Infrared Galaxies

classification 🌌 astro-ph
keywords quasarsgalaxieshiddeninfraredmanypoweredulirgsultraluminous
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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] 5007/Hbeta >~ 5), and ``warm'' IR color (f_{25}/f_{60} >~ 0.25).

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