The complex X-ray spectrum of NGC 4507

Free access article

Issue		A&A Volume 421, Number 2, July II 2004


Page(s)		473 - 477
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20047045

A&A 421, 473-477 (2004)
DOI: 10.1051/0004-6361:20047045

The complex X-ray spectrum of NGC 4507

G. Matt¹, S. Bianchi¹, F. D'Ammando¹ and A. Martocchia²

¹ Dipartimento di Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
² Observatoire Astronomique, 11 rue de l'Université, 67000 Strasbourg, France

(Received 9 January 2004 / Accepted 5 March 2004)

Abstract
XMM- Newton and Chandra/HETG spectra of the Compton-thin ( $N_{\rm H}\sim4\times10^{23}$ cm ^-2) Seyfert 2 galaxy, NGC 4507, are analyzed and discussed. The main results are: a) the soft X-ray emission is rich in emission lines; an (at least) two-zone photoionization region is required to explain the large range of ionization states; b) the 6.4 keV iron line is likely emitted from Compton-thick matter, implying the presence of two circumnuclear cold regions, one Compton-thick (the emitter), one Compton-thin (the cold absorber); c) evidence of an Fe XXV absorption line is found in the Chandra/HETG spectrum. The column density of the ionized absorber is estimated to be a few $\times10^{22}$ cm ^-2.

Key words: galaxies: individual: NGC 4507 -- galaxies: Seyfert -- X-rays: galaxies

Offprint request: G. Matt, matt@amaldi.fis.uniroma3.it

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