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Date and Time of the Query: 2019-07-20 T21:45:01 PDT
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For refcode 2002AJ....124...78C:
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Copyright by American Astronomical Society. Reproduced by permission
2002AJ....124...78C GALAXIES ON THE BLUE EDGE J. E. CABANELA Haverford College, 370 Lancaster Avenue, Haverford, PA 19041; jcabanel@haverford.edu AND J. M. DICKEY Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455; john@astro.umn.edu Received 2002 January 24; accepted 2002 April 1 ABSTRACT We have successfully constructed a catalog of H I-rich galaxies selected from the Minnesota Automated Plate Scanner catalog of the Palomar Observatory Sky Survey (POSS I), based solely on optical criteria. We identify H I-rich candidates by selecting the bluest galaxies at a given apparent magnitude, those galaxies on the blue edge of POSS I color-magnitude parameter space. Subsequent 21 cm observations on the upgraded Arecibo 305 m dish detected over 50% of the observed candidates. The detected galaxies are H I-rich, with H I masses comparable to "normal" high surface brightness disk galaxies, and they have gas mass-to-light ratios ranging from 0.1 to 4.8 (in solar units). Comparison of our candidate galaxies with known low surface brightness galaxies (hereafter LSBs) shows that they exhibit similar optical and H I properties to that population. We also show that previously identified LSBs, including several LSBs with red B-V colors, preferentially occupy the blue edge of POSS I color-magnitude parameter space. Their presence on the blue edge appears to be a selection effect due to differing plate limits in the two POSS I bandpasses. This suggests the POSS I is a good filter for separating galaxies on the higher surface brightness end of the LSB population from the general population of galaxies in the night sky. Key words: galaxies: peculiar - galaxies: statistics - surveys
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