A compact group of four QSOs with two appearing physically associated

Details A compact group of four QSOs with two appearing physically associated A compact group of four QSOs with two appearing physically associated

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..271h&link_type=abstract

Nature, vol. 282, Nov. 15, 1979, p. 271, 272.

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Astronomical Spectroscopy, Emission Spectra, Quasars, Red Shift, Galactic Clusters, Line Spectra, Spatial Distribution

Scientific paper

The observation of a cluster of four quasars within a diameter of about four arcmin is reported, and a possible physical association between two of them is discussed. The quasars were discovered in a quasar survey using an objective prism plate of the U.K. Schmidt telescope, which can reach magnitudes of about +20, as emission line objects with blue continuum spectra. The results of spectroscopic observations of the objects by the 200-in telescope on Mount Palomar confirm the previously noted similarity in redshift of three of the objects and support the idea that two of them are in close association, most likely members of the same galactic cluster. The possibility that the third object, with a difference in velocity of 13,000 km/sec with respect to the other two, is a member of the same cluster is also discussed.

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