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

2); (2) Univ. Bologna; (3) ESA Madrid; (4) APC Paris; (5) Univ. Roma3); E. Torresi (1; G.G.C. Palumbo (2); G. Ponti (4); M. Guainazzi (3); P. Grandi (1)

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

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arxiv 0901.3351 v1 pith:AVDVTF7X submitted 2009-01-21 astro-ph.HE

E. Torresi (1 , 2) , P. Grandi (1) , M. Guainazzi (3) , G.G.C. Palumbo (2) , G. Ponti (4) , S. Bianchi (5) ((1) INAF-IASF Bologna , (2) Univ. Bologna

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(3) ESA Madrid (4) APC Paris (5) Univ. Roma3)

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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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