Bounds on the enhancement of quasar counts by lenses

Details Bounds on the enhancement of quasar counts by lenses Bounds on the enhancement of quasar counts by lenses

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376...70k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 70-89. Research supported by Charles H. Revson Found

Statistics

Computation

6

Gravitational Effects, Gravitational Fields, Gravitational Lenses, Quasars, Approximation, Astronomical Models, Computational Astrophysics, Magnification

Scientific paper

The association between QSOs and galaxies are presently constrained on the basis of the conservation of brightness within two sets of general assumptions (exclusive of the character of the lenses involved). The first set of assumptions has background counts that are little affected by lenses; in the second, they may be strongly affected. Given an unaffected background, lenses can appreciably affect background counts. For an affected background, the least model-dependent bound for the association enhancement is obtained if the net contribution of the QSOs to the sky brightness is put into QSOs at the flux limit of the association sample.

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