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Astron. Astrophys. 319, 67-73 (1997)

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HI observations of dwarf galaxies in voids *

W.K. Huchtmeier 1, U. Hopp 2 and B. Kuhn 3

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn 1, Germany
2 Universitätssternwarte München, Scheiner Str.1, D-81679 München, Germany
3 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Received 6 October 1996 / Accepted 23 July 1996

Abstract

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 [FORMULA] values are systematically higher than expected from a local field comparison sample. Especially, for the 10 dwarfs in our sample (8.2 [FORMULA] 9.2) which appear to be highly isolated, a mean [FORMULA] = 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

* Tables 1 and 2 are also available in electronic form at CDS via ftp 130.79.128.5 or via

Send offprint requests to: W.K. Huchtmeier (huchtmeier@mpifr-bonn.mpg.de)

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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