Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-21
Astronomy and Astrophysics
Astrophysics
4 pages. Accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:200600023
Aims. The aim of this work is to identify and study spectral features in the quasar 3C 273 usually blended by its strong jet emission. Method. A historic minimum in the sub-millimetre emission of 3C 273 triggered coordinated multi-wavelength observations in June 2004. X-ray observations from the INTEGRAL, XMM-Newton and RXTE satellites are complemented by ground-based optical, infrared, millimetre and radio observations. The overall spectrum is used to model the infrared and X-ray spectral components. Results. Three thermal dust emission components are identified in the infrared. The dust emission on scales from 1 pc to several kpc is comparable to that of other quasars, as expected by AGN unification schemes. The observed weakness of the X-ray emission supports the hypothesis of a synchrotron self-Compton origin for the jet component. There is a clear soft-excess and we find evidence for a very broad iron line which could be emitted in a disk around a Kerr black hole. Other signatures of a Seyfert-like X-ray component are not detected.
Aller Hugh D.
Aller Margo F.
Chernyakova Maria
Courvoisier Thierry J. -L.
Foellmi Cédric
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