Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..542z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 542-549.
Astronomy and Astrophysics
Astrophysics
50
Astronomical Models, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Astronomical Photometry, Galactic Structure, Interacting Galaxies
Scientific paper
Models of the dynamical evolution of compact groups are combined with models of the evolution of the stellar populations in merger products to predict the morphology and colors of galaxies in compact groups. Models in which a compact group forms out of a loose group and evolves by merging until becoming a single elliptical galaxy in several Gyr conflict with several observations. These models predict that about 15 percent of the elliptical galaxies in compact groups should be more than 0.10 mag bluer in (B-V)O than normal for elliptical than normal for elliptical galaxies of their luminosity, whereas the observed value is lower (5.5 + 5.3/- 3.0 percent). In addition, 21 +/-3 percent of the galaxies in compact groups are elliptical galaxies, but these models predict that only about 13 percent of the galaxies in compact groups should be elliptical galaxies. The models agree much better with the observations if compact groups form in environments with a greater fraction of early-type galaxies relative to normal loose groups.
Whitmore Bradley C.
Zepf Stephen E.
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