Statistical determination of the profiles of Hickson's compact groups.

Details Statistical determination of the profiles of Hickson's compact groups. Statistical determination of the profiles of Hickson's compact groups.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apl%26c..36..223m&link_type=abstract

Astrophysical Letters and Communications, Vol. 36, Nos. 1 - 6, p. 223 - 228

Astronomy and Astrophysics

Astrophysics

Galaxy Groups: Galaxy Distribution, Galaxy Groups: Gravitational Lenses, Galaxy Groups: Statistical Methods

Scientific paper

The authors present a method to determine the density profiles of galaxy groups, based on the study of the average autocorrelation function of galaxy members. They have applied this method to a sample of 42 compact groups from Hickson's catalog. The results show that the distribution of intergalactic separations in Hickson's compact groups is compatible with a unique modified Hubble profile, for which the best fit yields a slope β = 1.4 and a core radius rc = 18 h-1 kpc. Hickson's groups are very compact structures. A lensing analysis shows that three Hickson compact groups are good candidates for strong lensing, if their optical velocity dispersions are not spuriously large due to interlopers.

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