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

R. Brent Tully | Zendy; Marc Verheijen | Zendy

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

Author(s) -

R. Brent Tully,

Marc Verheijen

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304318

Subject(s) - surface brightness , physics , astrophysics , brightness , fundamental plane (elliptical galaxies) , surface brightness fluctuation , galaxy , galaxy cluster , astronomy , photometry (optics) , brightest cluster galaxy , lenticular galaxy , stars

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

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