Gravitational lensing and quasar-galaxy correlations

Details Gravitational lensing and quasar-galaxy correlations Gravitational lensing and quasar-galaxy correlations

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339l..53n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 339, April 15, 1989, p. L53-L56.

Astronomy and Astrophysics

Astronomy

92

Dark Matter, Galactic Structure, Gravitational Lenses, Quasars, Red Shift, Black Holes (Astronomy), Statistical Correlation, Stellar Luminosity

Scientific paper

Webster and colleagues (1988) reported a significant excess of foreground galaxies in the vicinity of quasars. It is shown that if the effect is due to gravitational lensing, then the quasar-galaxy correlation must be smaller than the reported level by a factor of about 2 and/or the magnitude limit of the survey must be a few tenths of a magnitude brighter than the stated limit of B(J) = 18.7. Also, contrary to popular belief, the effect does not require that halos of foreground galaxies be composed of microlenses (stars, black holes, etc.); the quasar-galaxy correlation works equally well with smooth halos. These conclusions follow directly from the quasar luminosity function and are independent of the structure of the lens.

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