Volume 394, Number 3, November II 2002
|Page(s)||801 - 805|
|Section||Cosmology (including clusters of galaxies)|
|Published online||21 October 2002|
BeppoSAX/PDS identification of the true counterpart of the Piccinotti source H0917-074
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
Corresponding author: A. Malizia, firstname.lastname@example.org
Accepted: 5 August 2002
High energy emission has been discovered serendipitously by the BeppoSAX/PDS telescope in the ~1.3° 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 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 Kα 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 10-11 erg cm-2 s-1.
Key words: X-rays: galaxies / galaxies: Seyfert / galaxies: individual: MCG-1-24-12
© ESO, 2002
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