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Astronomy and Astrophysics 498 (2009) 61-66
3C 33: another case of photoionized soft X-ray emission in radio galaxies
E. Torresi1, 2, P. Grandi2, M. Guainazzi, G.G.C. Palumbo1, G. Ponti3, S. Bianchi4

All the observations available in the Chandra and XMM-Newton archives have been used to investigate the X-ray spectral properties of 3C 33. In this paper is presented a complete X-ray analysis of the nuclear emission of this narrow line radio galaxy. The broad band spectrum of 3C 33 is complex. The hard part resembles that of Seyfert 2 galaxies, with a heavily obscured nuclear continuum (N_H~10^23 cm^-2) and a prominent Fe Kalpha line. This represents the nuclear radiation directly observed in transmission through a cold circumnuclear gas. On the other hand an unabsorbed continuum plus emission lines seem to fit well the soft part of the spectrum (0.5-2 keV) suggesting that the jet does not significantly contribute to the X-ray emission. We discuss the possible collisional or photoionized origin of the gas that emits the soft X-ray lines. Our results, strengthened by optical spectroscopy favor the photoionization scenario.
1 :  Dipartimemto di Astronomia, Universita degli Studi di Bologna
2 :  Istituto di Astrofisica Spaziale e Fisica cosmica - INAF
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
4 :  Dipartimento di Fisica, Universita degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie

Physique/Astrophysique/Phénomènes cosmiques de haute energie
galaxies: active – X-rays: galaxies – X-rays: individuals: 3C 33
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