Journal
ASTRONOMY & ASTROPHYSICS
Volume 451, Issue 1, Pages L1-L4Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200600023
Keywords
quasars : general; quasars : individual : 3C 273; infrared : galaxies; X-rays : galaxies
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Funding
- Science and Technology Facilities Council [PP/D001013/1] Funding Source: researchfish
- STFC [PP/D001013/1] Funding Source: UKRI
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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.
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