A photometric and morphological study of compact groups of galaxies and their environments

Details A photometric and morphological study of compact groups of galaxies and their environments A photometric and morphological study of compact groups of galaxies and their environments

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........20k&link_type=abstract

Ph.D. Thesis British Columbia Univ., Vancouver. Dept. of Geophysics and Astronomy.

Physics

Geophysics

15

Astronomical Photometry, Galactic Clusters, Red Shift, Astrometry, Astronomical Catalogs, Morphology

Scientific paper

Astrometry, photometry, and morphological classifications were derived from camera images for all 463 galaxies in a sample of 100 compact groups in Hickson's 1982 catalog. Some minor revisions to the catalog are made. Morphological concordance occurs among galaxies within a group; more galaxies are the same type (spiral or nonspiral) than would be expected by chance. Galaxy morphological type correlates with group optical luminosity and, more strongly, with velocity dispersion, but not with galaxy space density. These results imply that the morphological types of galaxies in compact groups are strongly influenced by the environment, and that this influence occurs mostly at the time of galaxy formation. Fields surrounding 97 compact groups with known redshifts were examined, and coordinates, magnitudes, diameters, and Hubble types were derived for 3,389 galaxies in these fields. Results indicate that most groups are dense dynamical entities. Monte Carlo simulations show that 35 percent of galaxy quintets are predicted to contain a single discordant redshift due to the chance alignment of an unrelated field galaxy. This is in agreement with the observed number of four discordant quintets in 10, and these results are consistent with the cosmological interpretation of galaxy redshifts.

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