Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-10
Astron.Astrophys. 420 (2004) 79-88
Astronomy and Astrophysics
Astrophysics
11 pages,3 figures, Latex manuscript, Accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20040061
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 ($N_H\sim 2\times 10^{24}$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 $1^{+1.0}_{-0.5} \times 10^{44}$ ergs 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.
Bassani Loredana
Braito Valentina
Cappi Massimo
Ceca Roberto Della
Franceschini Alberto
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