Portal de Periódicos da CAPES

An H [CSC]i[/CSC] Survey of Actively Star-forming Dwarf Galaxies

2002; Institute of Physics; Volume: 124; Issue: 1 Linguagem: Inglês

10.1086/340951

1538-3881

John J. Salzer, Jessica L. Rosenberg, Eric W. Weisstein, J. M. Mazzarella, G. D. Bothun,

Stellar, planetary, and galactic studies

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 M⊙. In general, the sample galaxies are gas-rich, with an average MH I/LB = 1.3 after correcting for the luminosity enhancement due to the starburst. The progenitors of many of the star-forming dwarfs have higher MH I/LB than typically seen in samples of nearby "normal" galaxies, emphasizing their distinct nature.