Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...479..365p&link_type=abstract
Astronomy and Astrophysics, Volume 479, Issue 2, February IV 2008, pp.365-376
Astronomy and Astrophysics
Astrophysics
1
Radiation Mechanisms: Non-Thermal, X-Rays: Galaxies, Galaxies: Nuclei, Galaxies: Active, Quasars: Individual: 3C 273
Scientific paper
Context: Recent studies of the X-ray spectrum of the quasar 3C 273, analyzing both BeppoSAX data and XMM-Newton data, have shown that, depending on the state of the source, Seyfert-like spectral features, including a significant soft excess, can be detected superimposed on the generally overwhelming beamed non-thermal emission (“jet” component). Aims: In order to explain the Seyfert-like component and the soft excess suggested by the X-ray spectrum analysis, we apply to 3C 273 a recently developed model for non-thermal emission of X-rays from AGN disk coronae, originally intended for the explanation of Seyfert type X-ray emission. Methods: We perform an analysis of BeppoSAX data at different epochs, fitting the spectrum with a composition of a beamed “jet” component and our coronal model with a reflected component and an iron emission line. Results: We obtained reasonable fits of BeppoSAX spectra at different epochs by changing the relative weight of our emission model and of the jet power-law component. We find that in all these cases the low energy ( ≤ 2 keV) part of the X-ray spectrum is accounted for by our Seyfert-like model; we also verify the existence of a positive correlation between the Seyfert-like component 2-10 keV flux and the 0.2-2 keV flux of the so-called soft excess. Conclusions: The results outlined above confirm the plausibility of our non-thermal flare-like coronal model as a possible interpretation of Seyfert-like emission in AGNs. We can conclude that the interpretation of the Seyfert-like component in terms of our non-thermal corona model is offering, as a natural result, a description of the soft excess origin, which is still the subject of lively debate.
Pietrini Paola
Torricelli-Ciamponi Guidetta
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