Other
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426..524l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 426, no. 2, p. 524-534
Other
47
Disk Galaxies, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Red Shift, Spiral Galaxies, Diagrams, Populations, Star Formation, Stellar Spectrophotometry, Tables (Data)
Scientific paper
We have obtained deep B and R images of the spectroscopically confirmed blue cluster members of Abell 963, Abell 2111, and Abell 2125; a total of 19 galaxies. We find at least 50% of these blue galaxies are disk systems or have a disk system as one of their components. This fraction is undoubtedly higher as some systems are likely to be at inclinations unfavorable for determining their disk nature. Many of these disk galaxies are late-type systems apparent from the small bulge-to-disk ratios of these galaxies. Two of these galaxies are definitely spiral galaxies, identifiable because of their nearly face-on orientation, which suggests other disk galaxies are also spirals at inclinations unfavorable for resolving spiral structure. For the two nearly face-on spiral galaxies, the star formation appears to be extended over the disk of the galaxy rather than concentrated in the nucleus. If the cluster blue population, which can be as great as 20%, are indeed spirals, either clouds of spiral galaxies are falling into the cores of these rich clusters for the first time or spiral galaxies can be transformed into the elliptical and S0 galaxies present in clusters today. Galaxy-galaxy interactions and/or mergers probably play an important role in the transformation of this spiral population.
Henry Patrick J.
Lavery Russell J.
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