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Title:
An H I Survey of Actively Star-forming Dwarf Galaxies
Authors:
Salzer, John J.; Rosenberg, Jessica L.; Weisstein, Eric W.; Mazzarella, Joseph M.; Bothun, Gregory D.
Affiliation:
AA(Astronomy Department, Wesleyan University, Middletown, CT 06459; ), AB(Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305 ), AC(Wolfram Research, Inc., 100 Trade Center Drive, Champaign, IL 61820-7237 ), AD(Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology,770 South Wilson Avenue, Pasadena, CA 91125; ), AE(Department of Physics, University of Oregon, 1371 East 13th Avenue,Eugene, OR 97403; )
Publication:
The Astronomical Journal, Volume 124, Issue 1, pp. 191-212. (AJ Homepage)
Publication Date:
07/2002
Origin:
UCP
AJ Keywords:
Galaxies: Compact, Galaxies: Dwarf, Galaxies: ISM, Galaxies: Starburst
DOI:
10.1086/340951
Bibliographic Code:
2002AJ....124..191S

Abstract

We present the results of H I 21 cm observations of 139 actively star-forming dwarf galaxies obtained with the 305 m radio telescope at Arecibo Observatory. Our sample consists of all objects cataloged in objective-prism surveys for UV-excess or emission-line galaxies published prior to the start of the survey that have luminosities below MB=-17.0 and that are located within the declination limits of the Arecibo telescope. Galaxies from the Markarian, Michigan, Case, Wasilewski, Haro, and Zwicky lists are included. The sample spans a wide range of both H I gas content and star formation levels. A total of 122 objects (88%) were detected; 82 galaxies have been observed for the first time in H I. The median velocity width for our sample is 88 km s-1, and the median H I gas mass is 3.0×108 Msolar. In general, the sample galaxies are gas-rich, with an average MHI/LB=1.3 after correcting for the luminosity enhancement due to the starburst. The progenitors of many of the star-forming dwarfs have higher MHI/LB than typically seen in samples of nearby ``normal'' galaxies, emphasizing their distinct nature.
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