Quasar-galaxy pairs and surface density of quasars

Details Quasar-galaxy pairs and surface density of quasars Quasar-galaxy pairs and surface density of quasars

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..411n&link_type=abstract

Nature, vol. 270, Dec. 1, 1977, p. 411, 412. Research supported by the Foreign Office of France.

Physics

5

Density (Mass/Volume), Galaxies, Quasars, Angular Distribution, Distance

Scientific paper

It has been claimed by Arp (1976) that the observed small angular separations between a galaxy and its nearest quasar are explicable by chance only if the surface density of quasars is much larger than believed. To test such an assumption, the problem was studied by estimating directly the probabilities involved when adopting the most probable values of the density of quasars. Distribution curves of the angular separations for different values of the density of quasars are presented in a graph. A table is provided of the closest radio-quiet galaxy pairs. It is concluded that the small angular distances found between some radio-quiet quasars and galaxies do not disagree with the expected values corresponding to the most likely values of the surface density of quasars.

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