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Date and Time of the Query: 2019-06-26 T12:04:14 PDT
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For refcode 2015ApJ...806L..11P:
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2015ApJ...806L..11P The Unification of Powerful Quasars and Radio Galaxies and Their Relation to Other Massive Galaxies Podigachoski, Pece; Barthel, Peter; Haas, Martin; Leipski, Christian; Wilkes, Belinda Abstract. The unification model for powerful radio galaxies (RGs) and radio-loud quasars postulates that these objects are intrinsically the same but viewed along different angles. Herschel Space Observatory data permit the assessment of that model in the far-infrared spectral window. We analyze photometry from Spitzer and Herschel for the distant 3CR hosts, and find that RGs and quasars have different mid-infrared, but indistinguishable far-infrared colors. Both these properties, the former being orientation dependent and the latter orientation invariant, are in line with expectations from the unification model. Adding powerful radio-quiet active galaxies and typical massive star-forming (SF) galaxies to the analysis, we demonstrate that infrared colors not only provide an orientation indicator, but can also distinguish active from SF galaxies. Key words: galaxies: active, galaxies: formation, galaxies: high-redshift, galaxies: starburst, infrared: galaxies
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