Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..437t&link_type=abstract
In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19
Astronomy and Astrophysics
Astrophysics
2
Dark Matter, Galactic Clusters, Gravitational Lenses, Quasars, Background Radiation, Luminosity, Spatial Distribution
Scientific paper
Studies of dark matter using gravitational lenses are reviewed, with emphasis on recent maps of dark matter in galaxy clusters. Distant galaxies are 4 million times more numerous than QSOs and thus can sample a lens at multiple positions. To a surface brightness of 29 B mag/sq arcsec there are about 100 background galaxies per square arcmin, which is sufficient to map statistically the dark matter distribution in a foreground galaxy cluster. Automated pattern recognition software generates a 2D mass density map. There is evidence for a soft core of about 100 kpc radius for the dark matter in the rich clusters studied so far. The dark matter distribution in a cluster is found to be similar to the distribution of the bright galaxies.
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