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

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Letter to the Editor

Pairs of X-ray sources across Seyferts: the NGC4235 field

H. Arp

Max-Planck-Institut fur Astrophysik, Karl Schwarzscild-Str. 1, D-85740 Garching, Germany

Received 11 December 1996 / Accepted 31 July 1997


Two strong X-ray sources are paired about equally distant across the Seyfert galaxy NGC4235. It is shown here that they are a BL Lac object and a quasar. Comparison with other associations of X-ray AGN's with Seyferts reveals systematic alignments within about 20 degrees of the minor axis of the active galaxy. Fainter BSO candidates measured here suggest secondary associations of quasars with individual pair members and at closer distances to active galaxies.

Key words: X-rays: galaxies – galaxies: Seyfert – BL Lac objects: general

Send offprint requests to: H. Arp

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© European Southern Observatory (ESO) 1997

Online publication: March 26, 1998