The high energy emission line spectrum of NGC 1068

Free access article

Issue		A&A Volume 414, Number 1, January IV 2004


Page(s)		155 - 161
Section		Galactic structure and dynamics
DOI		http://dx.doi.org/10.1051/0004-6361:20031635

A&A 414, 155-161 (2004)
DOI: 10.1051/0004-6361:20031635

The high energy emission line spectrum of NGC 1068

G. Matt¹, S. Bianchi¹, M. Guainazzi² and S. Molendi³

¹ Dipartimento di Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
² XMM-Newton Science Operation Center/RSSD-ESA, Villafranca del Castillo, Spain
³ IASF-CNR, Via Bassini 15, 20133, Milano, Italy

(Received 21 August 2003 / Accepted 17 October 2003 )

Abstract
We present and discuss the high energy ( E>4 keV) XMM-Newton spectrum of the Seyfert 2 galaxy, NGC 1068. Possible evidence for flux variability in both the neutral and ionized reflectors with respect to a BeppoSAX observation taken 3.5 years before is found. Several Fe and Ni emission lines, from both neutral and highly ionized material, are detected. The intensity of the iron K $\alpha$ Compton shoulder implies that the neutral reflector is Compton-thick, likely the visible inner wall of the $N_{\rm H} > 10^{25}$ cm ^-2 absorber. From the equivalent width of the ionized iron lines a column density of a few $\times 10^{21}$ cm ^-2 is deduced for the hot ionized reflector. Finally, an iron (nickel) overabundance, when compared to solar values, of about 2 (4) with respect to lower Z elements, is found.

Key words: galaxies: individual: NGC 1068 -- galaxies: Seyfert -- X-rays: galaxies

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

SIMBAD Objects

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.