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

E. Torresi; P. Grandi; M. Guainazzi; G.G.C. Palumbo; G. Ponti; S. Bianchi

HAL : in2p3-00356684, version 1

arXiv : 0901.3351

Code Bibliographique ADS : 2009A&A...498...61T

DOI : 10.1051/0004-6361/200810944

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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. Torresi^{1, 2}, P. Grandi², M. Guainazzi, G.G.C. Palumbo¹, G. Ponti³, S. Bianchi⁴

(2009)

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 - AstroParticule et Cosmologie

4 :	Dipartimento di Fisica, Universita degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy

équipe(s) de recherche : APC - AHE

Thème(s)

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

Mot(s)-clé(s) : galaxies: active – X-rays: galaxies – X-rays: individuals: 3C 33

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0901.3351


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