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3C 33: another case of photoionized soft X-ray emission in radio galaxies

Abstract : 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.
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Contributor : Simone Lantz <>
Submitted on : Thursday, January 29, 2009 - 11:58:59 AM
Last modification on : Saturday, September 19, 2020 - 4:49:34 AM

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E. Torresi, P. Grandi, M. Guainazzi, G.G.C. Palumbo, G. Ponti, et al.. 3C 33: another case of photoionized soft X-ray emission in radio galaxies. Astronomy and Astrophysics - A&A, EDP Sciences, 2009, 498, pp.61-66. ⟨10.1051/0004-6361/200810944⟩. ⟨in2p3-00356684⟩

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