Volume 398, Number 1, January IV 2003
|Page(s)||107 - 111|
|Published online||14 January 2003|
XMM-Newton observations of ULIRGs: A Compton-thick AGN in IRAS 19254–7245
INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
2 Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
3 INAF - Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
4 IASF - CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
5 Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
6 INAF - Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy
7 INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
8 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, 02138, USA
Corresponding author: V. Braito, email@example.com
Accepted: 7 November 2002
We present the XMM-Newton observation of the merging system IRAS 19254-7245, also known as The Superantennae, whose southern nucleus is classified as a Seyfert 2 galaxy. The XMM- Newton data have allowed us to perform a detailed X-ray imaging and spectral analysis of this system. We clearly detect, for the first time in this system, a strong ( keV) Fe emission line at keV (rest-frame). The X-ray spectrum requires a soft thermal component ( keV; erg s-1), likely associated with the starburst, and a hard power-law continuum above 2 keV (observed erg s-1 ). We confirm the flatness of this latter component, already noted in previous ASCA data. This flatness, together with the detection of the strong Fe-Kα line and other broad band indicators, suggest the presence of a Compton-thick AGN with intrinsic luminosity ≳1044 erg s-1. We show that a Compton-thick model can perfectly reproduce the X-ray spectral properties of this object.
Key words: galaxies: active / galaxies: starburst / X-rays: galaxies / galaxies: individual: IRAS 19254-7245
© ESO, 2003
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