Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...46z&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 46-47 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Compact Galaxies, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Red Shift, Spiral Galaxies, Imaging Techniques, Kinematics, Low Speed, Velocity Distribution
Scientific paper
We investigate the role of mergers and interactions in the evolution of galaxies by studying galaxies in compact groups. Compact groups of galaxies have high spatial densities and low velocity dispersions making these regions ideal laboratories in which to study the effect of interactions and mergers. Based on a detailed spectroscopic and multi-color imaging study, we find that both the isophotal shapes and the stellar kinematics indicate that many of the elliptical galaxies in compact groups have been affected by tidal interactions. At the same time, however, we find that only a few elliptical galaxies in compact groups have evidence for the young stellar populations that would be expected if they are the result of recent merger of two spiral galaxies. Therefore, we conclude that tidal interactions affect galaxy properties at the current epoch, but the bulk of basic galaxy formation and transformation must have occurred at much higher redshift.
Whitmore Bradley C.
Zepf Stephen E.
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