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Astron. Astrophys. 320, 8-12 (1997)

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Very close pairs of quasi-stellar objects

G. Burbidge 1, F. Hoyle 2 and P. Schneider 3

1 Center for Astrophysics and Space Sciences and Department of Physics, University of California, La Jolla, California 92093-0111, USA
2 102 Admirals Walk, Bournemouth BH2 5HF Dorset, UK
3 Max Planck Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching bei München, Germany

Received 12 January 1996 / Accepted 13 September 1996

Abstract

It is pointed out that there are now known four very close pairs of QSOs with separations [FORMULA] arcsec and very different redshifts. Several estimates indicates that the probability that they are accidental configurations are small; a conservative estimate of the probability to have four such pairs by random projection yields [FORMULA]. We conclude either that this is further evidence that QSOs have significant non-cosmological redshift components, or that the pairs must be explained by gravitational lensing.

Key words: quasi-stellar objects galaxies: redshifts – gravitational lensing

Send offprint requests to: G. Burbidge

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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