Galaxies near distant quasars - Observational evidence for statistical gravitational lensing

Details Galaxies near distant quasars - Observational evidence for statistical gravitational lensing Galaxies near distant quasars - Observational evidence for statistical gravitational lensing

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204...73f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 73-80.

Astronomy and Astrophysics

Astrophysics

60

Galactic Structure, Gravitational Lenses, Quasars, Charge Coupled Devices, Space Density, Statistical Analysis

Scientific paper

The author presents an automatic galaxy-counting technique capable of providing non-subjective evidence for the association of galaxies and QSOs. Applying this procedure on deep CCD images of the fields of 12 distant (z ≥ 1.7) flat-spectrum quasars, he finds a significant rise of the number density of relatively bright (r < 21m.5) galaxies towards the quasar position. The most plausible explanation is gravitational lensing by foreground objects, especially by stars in intervening galaxies (micro-lensing). In some cases, the gravitational field of a group of galaxies surrounding the quasar image may give rise to additional amplification (macro-lensing).

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