Thin and giant luminous arcs - A strong test of the lensing cluster mass distribution

Details Thin and giant luminous arcs - A strong test of the lensing cluster mass distribution Thin and giant luminous arcs - A strong test of the lensing cluster mass distribution

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383...66h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 66-71.

Astronomy and Astrophysics

Astrophysics

67

Dark Matter, Galactic Clusters, Galactic Radiation, Gravitational Lenses, Spiral Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Brightness Distribution, Magnification, Mass Distribution

Scientific paper

The present study gives new expressions for the gravitational magnification and the ratio between source and image sizes, which apply to the giant thin and luminous arcs found in distant cluster cores, and for any number of lenses in the clusters. Available spectroscopic, imaging, and photometric observations are used to constrain the nature of the sources, which are argued to be spiral galaxies, and to derive new and independent conditions on the mass density profile of the dark matter inside the lensing clusters. It is proposed that most of the lensing clusters are much more compact than inferred from their X-ray density profiles and even more compact than inferred from their visible luminosity profile, except if there was an enormous evolution of the entire luminosity function of galaxies with z in the range of 0.4 to about 0.8. It is argued that the sources of the small and giant arclets found in deep images of distant clusters are dwarf galaxies at moderate redshift (not more than 1).

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