Gravitational micro-lensing for large sources

Details Gravitational micro-lensing for large sources Gravitational micro-lensing for large sources

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250...62r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 62-66. Research supported by NAF.

Astronomy and Astrophysics

Astrophysics

44

Gravitational Lenses, Quasars, Stellar Gravitation, Astrophysics, Gravitational Effects

Scientific paper

Gravitational microlensing of large sources caused by a randomly distributed field of point masses (stars, black holes) in a foreground galaxy is considered. For an angular source size larger than a few times the Einstein ring for the representative star mass, a simple analytical formula giving the typical (de)amplification due to microlensing is derived. Numerical test calculations agree very well with the analytical results. For some multiply imaged QSOs tentative upper limits on the size of the broad emission line region can be given.

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