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Astron. Astrophys. 327, 479-482 (1997)

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Research Note

Concentration of quasars
around the active extragalactic object 3C 345

Halton Arp

Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany

Received 11 March 1997 / Accepted 24 June 1997


It is shown that there is an over density of about a dozen fainter, generally higher redshift quasars around the bright,strongly variable 3C 345. The associated quasars are generally aligned through 3C 345 with an accuracy that is highly improbable to occur by chance. There is a Seyfert 1 galaxy (NGC6212) within 4.7 arc min of 3C 345, as in many other significant associations of quasars with low redshift galaxies. The excess of quasars around 3C 345 and the Seyfert (a factor of 15) is similar to the excess of quasars around the jet Seyfert NGC1097 (a factor of 20) which was found in 1984. It is noted that at a redshift of z= .59, 3C 345 is like a number of other bright apparent magnitude quasars of medium redshift which fall significantly close to low redshift, active galaxies and exhibit alignments of X-ray sources and X-ray BSO's and quasars.

Key words: quasars: individual: 3C 345 – galaxies: NGC 6212 – X-rays: galaxies – quasars: general

Send offprint requests to: H. Arp

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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998