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Issue A&A
Volume 394, Number 3, November II 2002
Page(s) 801 - 805
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20021202



A&A 394, 801-805 (2002)
DOI: 10.1051/0004-6361:20021202

BeppoSAX/PDS identification of the true counterpart of the Piccinotti source H0917-074

A. Malizia1, G. Malaguti1, L. Bassani1, M. Cappi1, A. Comastri2, G. Di Cocco1, E. Palazzi1 and C. Vignali3

1  IASF/CNR, via Piero Gobetti 101, 40129 Bologna, Italy
2  INAF/Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
3  Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA

(Received 20 June 2002 / Accepted 5 August 2002)

Abstract
High energy emission has been discovered serendipitously by the BeppoSAX/PDS telescope in the ~1.3 $^{\circ}$ field of view around the Piccinotti source H0917-074. A re-pointing of BeppoSAX/NFI has allowed the association of this emission with the Seyfert 2 galaxy MCG-1-24-12 which lies within the original HEAO1/A2 error box of H0917-074. This is the first PDS serendipitous discovery of a Seyfert 2 galaxy and the first detection of MCG-1-24-12 in the X-ray domain. The measured 2-10 keV flux of MCG-1-24-12 is ~1 $\times$ 10 -11 erg cm -2 s -1 compatible with the Piccinotti HEAO-1/A2 observation. This is a factor of ~6 greater than that observed from EXO0917.3-0722, originally suggested as the counterpart of the Piccinotti source. The 2-10 keV spectrum of MCG-1-24-12 shows the presence of Fe K $_{\alpha}$ emission together with an absorption feature at ~8.7 keV. At high energies, the Seyfert 2 still dominates and the observed 20-100 keV flux is ~4 $\times$ 10 -11 erg cm -2 s -1.


Key words: X-rays: galaxies -- galaxies: Seyfert -- galaxies: individual: MCG-1-24-12

Offprint request: A. Malizia, malizia@bo.iasf.cnr.it

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© ESO 2002


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