HI observations of dwarf galaxies in voids *
W.K. Huchtmeier 1,
U. Hopp 2 and
B. Kuhn 3
Received 6 October 1996 / Accepted 23 July 1996
We report HI-observations of a sample of 43 optically selected galaxies from the Heidelberg-void project. Only emission line galaxies have been selected. The HI-detection rate was 67%. The observed sample is a mix in late-type morphology objects with a spread in luminosity. They were compared to other samples with similar selection effects and mixtures. The detected galaxies have a high HI content and their values are systematically higher than expected from a local field comparison sample. Especially, for the 10 dwarfs in our sample (8.2 9.2) which appear to be highly isolated, a mean = 1.8 was derived which is higher than for all comparison samples, including those with the same restricted luminosity range. We discuss a trend in our data between the relative HI-content and the surrounding galaxy density holding from very high densities (Virgo-cluster) to the very isolated objects at the rims of the voids.
We also present HI observations of 7 HII-galaxies of the University of Michigan (UM) sample.
Key words: surveys galaxies: ISM; distances and redshifts large-scale-structure galaxies: interactions radio lines: galaxies
Send offprint requests to: W.K. Huchtmeier (firstname.lastname@example.org)
© European Southern Observatory (ESO) 1997
Online publication: July 3, 1998