EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 420/1 Article
Free access article

Issue A&A
Volume 420, Number 1, June II 2004
Page(s) 79 - 88
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20040061



A&A 420, 79-88 (2004)
DOI: 10.1051/0004-6361:20040061

The XMM-Newton and BeppoSAX view of the Ultra Luminous Infrared Galaxy MKN 231

V. Braito1, 2, R. Della Ceca1, E. Piconcelli3, 4, P. Severgnini1, L. Bassani3, M. Cappi3, A. Franceschini2, K. Iwasawa5, G. Malaguti3, P. Marziani6, G. G. C. Palumbo7, M. Persic8, G. Risaliti9, 10 and M. Salvati9

1  INAF - Osservatorio Astronomico di Brera, Milano, Italy
2  Dipartimento di Astronomia, Università di Padova, Italy
3  IASF - CNR, Bologna, Italy
4  XMM-SOC (VILSPA), ESA, Madrid, Spain
5  Institute of Astronomy, University of Cambridge, Madingley Road Cambridge CB3 OHA, UK
6  INAF - Osservatorio Astronomico di Padova, Italy
7  Dipartimento di Astronomia, Università di Bologna, Italy
8  INAF - Osservatorio Astronomico di Trieste, Italy
9  INAF - Osservatorio Astrofisico di Arcetri, Firenze, Italy
10  Harvard-Smithsonian Center for Astrophysics, Cambridge, USA

(Received 28 May 2003 / Accepted 15 January 2004)

Abstract
We discuss XMM-Newton and BeppoSAX observations of MKN 231, the lowest-redshift Broad Absorption Line (BAL) QSO known so far and one of the best-studied Ultra Luminous Infrared Galaxies. By combining the XMM-Newton spectral resolution and the high-energy bandpass of BeppoSAX we have been able to study in more detail than previously possible its 0.2-50 keV spectral properties. The BeppoSAX PDS data unveiled, for the first time, a highly absorbed ( $N_{\rm H}\sim 2\times 10^{24}$  cm -2) power-law component. We find that: a) below 10 keV we are seeing only reprocessed radiation through reflection and/or scattering; b) the intrinsic 2-10 keV luminosity of MKN 231 is  $ 1^{+1.0}_{-0.5} \times 10^{44}$  erg s -1, i.e. more than an order of magnitude greater than previous measurements; c) the starburst activity significantly contributes to the soft ( E<2 keV) X-ray emission.


Key words: X-rays: galaxies -- galaxies: individual: Markarian 231

Offprint request: V. Braito, braito@brera.mi.astro.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.