Arecibo H i Mapping of a Large Sample of Dwarf Irregular Galaxies

August 1996 • 1996ApJS..105..269H

Authors • Hoffman, G. Lyle • Salpeter, E. E. • Farhat, B. • Roos, T. • Williams, H. • Helou, G.

Abstract • Neutral hydrogen mapping of 70 dwarf irregular (Sm, Im, and BCD) galaxies is reported, with position-velocity contour maps (and a few contour maps in R.A. and decl.) presented for those resolved by the Arecibo beam. The galaxies were selected either from the Virgo Cluster Catalog, from similarly identified field galaxies, or from a distance- limited sample within the Arecibo declination range. We do not find any isolated dwarfs with a larger H I to optical radius ratio than DDO 154; the "protogalaxy" H I 1225+01 of Giovanelli & Haynes continues to be a unique object among dwarfs that have been mapped in H I. For all dwarfs with significant rotation, we are able to determine the sense of the spin. For a number of better resolved dwarfs, we are able to determine rotation curves, in most cases extending well beyond the last measured point in available synthesis array maps. Correlations among the several measures of galaxy size and mass are studied; in a companion paper we combine these data with those for the set of all available mapped dwarf irregular galaxies and for mapped spirals spanning a similar range of redshifts to investigate variations in Tully-Fisher relations and in surface densities as functions of galaxy size and luminosity or mass.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=1996ApJS..105..269H
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/1996ApJS..105..269H
• PREPRINT http://arxiv.org/abs/astro-ph/9601183
• GIF http://articles.adsabs.harvard.edu/full/1996ApJS..105..269H
• ARTICLE http://articles.adsabs.harvard.edu/full/1996ApJS..105..269H?defaultprint=YES
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/9601183