The Ursa Major Cluster of Galaxies. II. Bimodality of the Distribution of Central Surface Brightnesses

Details The Ursa Major Cluster of Galaxies. II. Bimodality of the Distribution of Central Surface Brightnesses The Ursa Major Cluster of Galaxies. II. Bimodality of the Distribution of Central Surface Brightnesses

1997-03-05

arxiv.org/abs/astro-ph/9703029v1

Astronomy and Astrophysics

Astrophysics

Latex file produces 38 pages with 2 tables and 14 figures. A gzipped PostScript file can be retrieved from ftp://kapteyn.ast

Scientific paper

10.1086/304318

The Ursa Major Cluster appears to be unevolved and made up of HI-rich spiral galaxies. B,R,I,K' photometry has been obtained for 79 galaxies, including 62 in a complete sample with M(B)<-16.5 mag. The K' information is particularly important for the present discussion because it is not seriously affected by obscuration. There is reasonably convincing evidence that the distribution of exponential disk central surface brightnesses is bimodal. Disks avoid the domain between the high and low surface brightness zones. The few intermediate surface brightness examples in the sample all have significant nearby neighbors. The high surface brightness (HSB) galaxies exhibit a range -21

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