EDP Sciences
Free access
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

SIMBAD Objects



© ESO 2004

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.