Environment of compact groups of galaxies

Details Environment of compact groups of galaxies Environment of compact groups of galaxies

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1476p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 4, p. 1476-1484

Astronomy and Astrophysics

Astronomy

23

Compact Galaxies, Density Distribution, Spatial Distribution, Spiral Galaxies, Astronomical Catalogs, Astronomical Satellites, Galactic Mass, Magnitude, Morphology, Position (Location), Sky Surveys (Astronomy)

Scientific paper

Fields surrounding 91 compact groups of galaxies in Hickson's catalog have been searched for neighboring galaxies,within a radius of 1.0/h Mpc. Position magnitudes, sizes, and morphological types of 2711 galaxies, measured from paper prints of the Palomar Observatory Sky Survey (POSS), are used to study the density distribution and fraction of spiral galaxies in the environment of these groups. 71% of the groups shows typical suface densities over 100 times larger than their close environments. 82% show no significant concentations of galaxies within 0.5/h Mpc radius. The compact groups have a significantly different distribution of spiral fraction than do their environments, as does the subsample of the 16 groups embedded in a rich environment. There is no correlation between the spiral fraction in a group and in its environment. The mean spiral fraction for the galaxies in the environments is 54%, as compared to 45% for the compact groups. These results condradict the view that most compact groups are a result of chance alignments. Rather, they suggest that the compact group formation process can efficiently operate in regions of relatively low galaxy density.

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