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Title: THE UNIFICATION OF POWERFUL QUASARS AND RADIO GALAXIES AND THEIR RELATION TO OTHER MASSIVE GALAXIES

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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Kapteyn Astronomical Institute, University of Groningen, 9747 AD Groningen (Netherlands)
  2. Astronomisches Institut, Ruhr Universität, D-44801 Bochum (Germany)
  3. Max-Planck Institut für Astronomie (MPIA), D-69117 Heidelberg (Germany)
  4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
22518960
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 806; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; FAR INFRARED RADIATION; INDICATORS; INTERMEDIATE INFRARED RADIATION; ORIENTATION; PHOTOMETRY; QUASARS; RADIO GALAXIES; RED SHIFT; SPACE; STAR EVOLUTION; STARS