Optical colors of early-type galaxies in compact groups

Details Optical colors of early-type galaxies in compact groups Optical colors of early-type galaxies in compact groups

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..524z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 524-541.

Mathematics

Logic

76

Astronomical Photometry, Color, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Astronomical Models, Charge Coupled Devices, Color-Color Diagram, Galactic Structure, Interacting Galaxies, Spectrophotometry, Ubv Spectra

Scientific paper

UBVRI colors of a sample of 55 elliptical galaxies as well as 21 S0 galaxies in Hickson compact groups are presented. Four of the elliptical galaxies and one of the S0 galaxies in the compact groups are significantly bluer than normal for early-type galaxies of their luminosity. A population of elliptical galaxies with blue optical colors is predicted by standard models of the evolution of galaxies in compact groups because of the favorable conditions for interactions and mergers in these regions. The brightest of the blue elliptical galaxies has an extensive shell system; however, the other two blue elliptical galaxies for which there is sufficient spatial resolution show no unusual morphological features such as tails or shells. In addition to their color, the primary distinguishing feature of the blue elliptical galaxies is their color gradient, as they tend to be bluer in the center than at large radii, which is contrary to the usual trend in elliptical galaxies.

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