A historic jet-emission minimum reveals hidden spectral features in 3C 273

作者：Turler M^*; Chernyakova M; Courvoisier TJL; Foellmi C; Aller MF; Aller HD; Kraus A; Krichbaum TP; Lahteenmaki A; Marscher A; McHardy IM; O'Brien PT; Page KL; Popescu L; Robson EI; Tornikoski M; Ungerechts H

来源：Astronomy & Astrophysics, 2006, 451(1): L1-L4.

DOI：10.1051/0004-6361:200600023

• quasars : general
• quasars : individual : 3C 273
• infrared : galaxies
• X-rays : galaxies

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.
Methods. A historic minimum in the sub-millimetre emission of 3C 273 triggered coordinated multi-wavelength observations in June 2004. length X-ray observations from the INTEGRAL, XMM-Newton and RXTE satellites are complement 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.

• 出版日期2006-5