Rich cluster microlensing

Details Rich cluster microlensing Rich cluster microlensing

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275l..41w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 3, pp. L41-L45.

Astronomy and Astrophysics

Astronomy

10

Galaxies: Clusters: General, Quasars: General, Dark Matter, Gravitational Lensing

Scientific paper

We consider the possibility of detecting dark matter in clusters of galaxies via gravitational microlensing of background quasars. We compute the expected number of lensed quasars as a function of cluster redshift, for a given field of view and magnitude limit. With the wide field of the MACHO camera, this number peaks at z~=0.04 and, if all the cluster dark matter is in compact form, we expect roughly one microlensed quasar behind every rich cluster at this distance, to a limit of B=21. Photometric monitoring of quasars could reveal lumps of cluster dark matter in the range 10^-4-1M_solar, provided that the continuum emission arises from a region of dimension ~10^14 cm or less.

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