Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4504l&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #45.04; Bulletin of the American Astronomical Society, Vol. 24, p.1192
Mathematics
Logic
Scientific paper
The presence of a population of blue star-forming galaxies in distant rich clusters of galaxies is known as the ``Butcher-Oemler'' effect. Lavery & Henry (1988, 1993) and Lavery (1990) presented evidence that galaxy-galaxy interactions play a major role in inducing the star formation in these blue cluster galaxies at a redshift of 0.2. But, to address this possibility at higher redshifts, sub-arcsecond imaging observations are a necessity. We present high-resolution (FWHM=0.5") images of three distant rich clusters of galaxies, Cl0016+1609 (z=0.54), Cl0303+1706 (z=0.42) and Cl0939+4713 (z=0.41), obtained using the High-Resolution Camera on the CFHT (McClure et al. 1989). We find a significant fraction of the emission-line and the ``post-starburst'' E+A galaxies in these clusters to be in interacting systems or show morphological features suggestive of a recent interaction. These observations support the conclusion of Lavery, Pierce, & McClure (1992), based of HRCam images of the blue galaxy populations of Abell 370 (z=0.37) and Cl0024+1654 (z=0.39), that galaxy-galaxy interactions, as well as mergers, are responsible for the star bursts observed in the majority of the blue galaxies in rich clusters at a redshift of 0.4. This result, and those of Lavery & Henry (1988, 1993) and Lavery (1990) at the lower redshift of 0.2, suggests that galaxy-galaxy interactions/mergers play a major role in the evolution of the galaxy population in rich clusters at these redshifts. Lavery, R. J. 1990, in Dynamics and Interactions of Galaxies. Lavery, R. J., & Henry, J. P. 1988, ApJ, 330, 596. __________. 1993, in preparation. Lavery, R. J., Pierce, M. J., & McClure, R. D. 1992, AJ, in press. McClure, R. D., et al. 1989, PASP, 101, 1156.
Lavery Russell J.
McClure Robert D.
Pierce Michael J.
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