Volume 498, Number 1, April IV 2009
|Page(s)||61 - 66|
|Published online||11 March 2009|
3C 33: another case of photoionized soft X-ray emission in radio galaxies
Istituto di Astrofisica Spaziale e Fisica Cosmica-Bologna, INAF, via Gobetti 101, 40129 Bologna, Italy e-mail: email@example.com
2 Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
3 European Space Astronomy Center of ESA, Apartado 50727, 28080 Madrid, Spain
4 APC, Université Paris 7 Denis Diderot, 75205 Paris Cedex 13, France
5 Dipartimento di Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
Accepted: 14 January 2009
We investigate the X-ray spectral properties of 3C 33 by analyzing all the observations available in the Chandra and XMM-Newton archives. In this paper we present a complete X-ray analysis of the nuclear emission of this narrow-line radio galaxy. The broad-band spectrum of 3C 33 is complex. Its hard part resembles that of Seyfert 2 galaxies, which have a heavily obscured nuclear continuum (NH ~ 1023 cm-2) and a prominent Fe Kα line. This represents the nuclear radiation observed directly in transmission through a cold circumnuclear gas. On the other hand an unabsorbed continuum plus emission lines seem to reproduce the soft part of the spectrum (0.5-2 keV) well, suggesting that the jet does not contribute significantly 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, supported by those from optical spectroscopy, favor the photoionization scenario.
Key words: galaxies: active / X-rays: galaxies / X-rays: individuals: 3C 33
© ESO, 2009
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