AAS 207th Meeting, 8-12 January 2006
Session 179 Evolution of Galaxies, and Galaxies Surveys at Low Redshift
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[179.19] An Optically Unbiased Look at the Local Universe: Properties of the ADBS HI-Selected Sample of Galaxies.

J.J. Salzer, N.M. Tresser (Wesleyan U.), J.L. Rosenberg, S. Stevenson (Harvard/CfA)

The Arecibo Dual Beam Survey (ADBS) is a blind, HI 21-cm survey for galaxies that was carried out during the Gregorian upgrade of the Arecibo 305-m telescope. The survey found 265 galaxies within the roughly 430 sq. degrees of the survey. We present the results of a follow-up optical study of the ADBS galaxies. Optical broad-band images have been obtained for nearly the entire sample in B and V, and these data are used to derive magnitudes, colors, galaxy types, and surface photometry. Fully half of the ADBS galaxies are fainter than B = 15.5, despite the fact that the sample is limited to galaxies with redshifts of less than 8000 km/s. A large fraction of the detected galaxies are dwarfs, many of them with extremely low-surface brightnesses. We illustrate the types of galaxies found in this HI survey and present a complete picture of their optical properties. One ADBS object appears to possess no optical counterpart and is a possible example of a starless HI cloud.

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