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Astron. Astrophys. 328, L17-L20 (1997)

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1. Introduction

Recent analyses of X-ray fields around Seyfert galaxies have shown that bright X-ray sources are overabundant up to distances of almost one degree (Radecke 1997). Many of these sources are paired across the active central galaxy (Arp1997a). Most of the associated X-ray sources have been identified with blue stellar objects (BSO's) whose redshifts, when measured, confirm them as quasars and AGN's.

The pair of X-ray quasars across NGC 4258 has been published (Pietsch et al. 1994; E.M. Burbidge 1995) and discussed (Arp 1997b). The results on the second Seyfert field investigated, NGC2639, show a pair of quasars with very similar redshifts of z =.307 and.325 (E.M. Burbidge 1997). The third field to be investigated, NGC4235, is reported here. It is considered to be particularly important because it introduces evidence for alignment of the X-ray AGN's along the minor axis of the active galaxy and also lists the positions of candidates for fainter quasars which appear associated with each bright AGN in the pair.

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© European Southern Observatory (ESO) 1997

Online publication: March 26, 1998