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Astron. Astrophys. 319, 18-32 (1997)


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X-ray sources < 1 degree from Seyfert galaxies

H.-D. Radecke

Max-Planck-Institut für Astrophysik, D-85740 Garching, Germany

Received 25 March 1996 / Accepted 30 June 1996

Abstract

Archived PSPC observations of 26 Seyfert galaxies have been analyzed for bright X-ray sources out to the full extent of the field ([FORMULA]  about  [FORMULA]). Of all Seyferts known this represents a sample 88% complete to [FORMULA] mag, 74% complete to 11 mag and 50% complete to 12 mag. Using the same reduction algorithm, 14 fields centered on stars at high galactic latitudes have been used as control fields. Excluding the two brightest Seyferts, a subset of 24 Seyferts with corrected apparent magnitude between [FORMULA] mag show a minimum excess of 46 bright X-ray sources generally distributed between 10 and [FORMULA] from the target galaxy. The significances of association of these sources with the Seyferts in the median brightness range are as high as 7.4 sigma.

Key words: galaxies: Seyfert – galaxies: spiral – X-rays: galaxies

Send offprint requests to: H.-D. Radecke

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998

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