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Detection of systematic gravitational lens galaxy image alignments - Mapping dark matter in galaxy clusters
Tyson, J. A.; Valdes, F.; Wenk, R. A.
AA(AT&T Bell Laboratories, Murray Hill, NJ), AB(National Optical Astronomy Observatoires, Tucson, AZ), AC(AT&T Bell Laboratories, Murray Hill, NJ),
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. L1-L4. (ApJL Homepage)
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NASA/STI Keywords:
Dark Matter, Galactic Clusters, Gravitational Lenses, Brightness Distribution, Charge Coupled Devices, Faint Objects, Red Shift, Spatial Distribution
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A gravitational lens distorts most background galaxies by stretching along a circle centered on the lens. This systematic alignment of 20-60 faint background galaxy images has been detected, centered on foreground galaxy clusters of high velocity dispersion. The background galaxy population is selected by its extreme blue B-R color. At a limiting surface brightness of 29 B mag/sq arcsec, there are over 30 background galaxies/sq arcmin per mag anywhere in the sky, which is sufficient to map statistically the dark matter distribution in a foreground cluster. The dark matter is apparently correlated (center and radial extent) with the cluster red light, suggestive of a baryonic origin or dissipative coupling. The existence of a high percentage of lens-distorted faint blue galaxies sets a lower limit of approximately 0.9 to this background galaxy population mean redshift.

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