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For refcode 1996AJ....112.2471T:
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Copyright by American Astronomical Society. Reproduced by permission
1996AJ....112.2471T THE URSA MAJOR CLUSTER OF GALAXIES. I. CLUSTER DEFINITION AND PHOTOMETRIC DATA R. BRENT TULLY Institute for Astronomy, University of Hawaii, Honolulu, Hawaii 96822 Electronic mail: tully@ifa.hawaii.edu MARC A. W. VERHEIJEN Kapteyn Astronomical Institute, University of Groningen, Postbus 800, Groningen, The Netherlands Electronic mail: verheyen@astro.rug.nl MICHAEL J. PIERCE Department of Astronomy, Indiana University, Bloomington, Indiana 47405 Electronic mail: mpierce@astro.indiana.edu JIA-SHENG HUANG AND RICHARD J. WAINSCOAT Institute for Astronomy, University of Hawaii, Honolulu, Hawaii 96822 Electronic mail: huang@ifa.hawaii.edu and rjw@ifa.hawaii.edu Received 1996 June 7; revised 1996 August 20 ABSTRACT The Ursa Major Cluster has received remarkably little attention, although it is as near as the Virgo Cluster and contains a comparable number of H I-rich galaxies. In this paper, criteria for group membership are discussed and data are presented for 79 galaxies identified with the group. Of these, all 79 have been imaged at B,R,I bands with CCDs, 70 have been imaged at K' with a HgCdTe array detector, and 70 have been detected in the HI 21 cm line. A complete sample of 62 galaxies brighter than M_B_ = - 16.5 is identified. Images and gradients in surface brightness and color are presented at a common linear scale. As has been seen previously, the galaxies with the reddest global colors are reddest at the centers and get bluer at large radii. However, curiously, among the galaxies with the bluest global colors there are systems with very blue cores that get redder at large radii.
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