J/A+A/319/33 J/A+A/319/33 Identification of X-ray sources around Seyferts H C Arp Astron. Astrophys. 319 33 1997 1997A&A...319...33A Galaxies, Seyfert X-ray sources BL Lacertae objects: general galaxies: Seyfert quasars: general X-rays: galaxies Excess numbers of X-ray sources around bright Seyfert galaxies have been demonstrated with significances of association up to 7.4-sigma (Radecke, 1997A&A...319...18R). The optical identification of these sources is shown here to be predominantly blue stellar objects (BSO's) of which some are already catalogued as quasars. Excluding the two brightest Seyferts, a subset of 24 with apparent magnitudes between 8.04<=B_T_^o,i^<=12.90mag. show a minimum excess of >46 bright X-ray sources. These excess X-ray sources are generally distributed between 10'<r<40' and 12 of the Seyferts show conspicuous pairs of X-ray sources across their active nuclei. Additional pairing and alignment of sources is seen for the remaining Seyferts. Among the paired X-ray sources, 53 have been identified as BSO's. Some double and multiple BSO's have been identified which are candidates for groups and associations of quasars. Some groups are well aligned and some centered on small blue galaxies. Four previously known BL Lac objects fall close enough to the Seyferts in this sample to confirm, at a significance level of 1-2x10^-9^, a previously reported association of BL Lac objects with bright, low redshift galaxies.

NGC 423512 17 09.8+07 11 29 NGC 351611 06 47.4+72 34 07 NGC 527313 42 08.3+35 39 15 NGC 554814 17 59.5+25 08 13

Gal Galaxy name --- C Counts of the source in the .5-20keV band number=1 Each map was inspected for patterns of pairs or alignments of sources across the central Seyfert. The sources which made up these patterns were then identified by their C=cts/ks values and are referred to by these numbers. ct/ks m_C Multiplicity index no C --- RAh Right ascension (2000) h RAm Right ascension (2000) min RAs Right ascension (2000) s u_RAs Uncertainty flag on right ascension --- DE- Declination sign --- DEd Declination (2000) deg DEm Declination (2000) arcmin DEs Declination (2000) arcsec u_DEs Uncertainty flag on declination --- n_Emag B when Emag is Bmag --- l_Emag Limit flag on Emag --- Emag E magnitude or B magnitude if n_Emag = B mag l_O-E Limit flag on O-E --- O-E O-E color index mag n_O-E b for blue --- Ident Identification --- DELTAx X optical identification position with respect to the X-ray position number=2 + is East and - is West of the X-ray position + is North and - is South of the X-ray position arcsec DELTAy Y optical identification position with respect to the X-ray position number=2 + is East and - is West of the X-ray position + is North and - is South of the X-ray position arcsec Rem Remarks --- table3.texTeX version of table3 Patricia Bauer CDS 1997Feb24 J_A+A_319_33.xml