Computer Science
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..358w&link_type=abstract
Nature (ISSN 0028-0836), vol. 336, Nov. 24, 1988, p. 358, 359. Research supported by SERC and NSERC.
Computer Science
96
Gravitational Lenses, Luminosity, Mass Distribution, Faint Objects, Quasars, Red Shift, Statistical Distributions
Scientific paper
Evidence is presented for the detection of distant quasars associated with foreground galaxies. The quasars which are juxtaposed with faint galaxies are compared with a control sample of quasars selected using identical techniques. Clear statistical evidence is found for a greater number of quasar-galaxy juxtapositions than would be expected from random alignments. A possible explanation is gravitational lensing of the background quasars by matter associated with the foreground galaxies. From the enhancement of the quasar surface density in the vicinity of the galaxies, some general conclusions about the distribution of the lensing matter are drawn. In particular, it is shown that the mass associated with the foreground galaxies must be substantially greater than is conventionally attributed to a luminous galaxy and its halo.
Harding Margaret E.
Hewett Paul C.
Webster Rachel L.
Wegner Gary. A.
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