Volume 420, Number 1, June II 2004
|Page(s)||79 - 88|
|Published online||14 May 2004|
The XMM-Newton and BeppoSAX view of the Ultra Luminous Infrared Galaxy MKN 231
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
Corresponding author: V. Braito, email@example.com
Accepted: 15 January 2004
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 ( 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 erg s-1, i.e. more than an order of magnitude greater than previous measurements; c) the starburst activity significantly contributes to the soft ( keV) X-ray emission.
Key words: X-rays: galaxies / galaxies: individual: Markarian 231
© ESO, 2004
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