A&A 378, 370-393 (2001)
DOI: 10.1051/0004-6361:20011241

HI observations of loose galaxy groups

I. Data and global properties

W. van Driel^{1, 2}, P. Marcum³, J. S. Gallagher III⁴, E. Wilcots⁴, C. Guidoux⁵ and D. Monnier Ragaigne<sup>1

1</sup>  DAEC, UMR CNRS 8631, Observatoire de Paris, Section de Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France
    e-mail: wim.vandriel@obspm.fr; delphine.ragaigne@obspm.fr
²  Unité Scientifique Nançay, USR CNRS B704, Observatoire de Paris, 18330 Nançay, France
³  Department of Physics and Astronomy, Texas Christian University, Box 298840, Fort Worth, TX 76129, USA
    e-mail: p.marcum@tcu.edu
⁴  Astronomy Department, University of Madison-Wisconsin, 475 N. Charter St., Madison WI 53706-1582, USA
    e-mail: jsg@astro.wisc.edu; ewilcots@astro.wisc.edu
⁵  Faculté des Sciences et des Techniques, Université de Tours, Avenue Monge, 37000 Tours, France

(Received 24 July 2001 / Accepted 4 September 2001)

Abstract
At Nançay, 21-cm H I line observations were made of 15 spiral-dominated loose groups of galaxies, divided into two samples: an "interacting" sample containing at least one pair of interacting galaxies, and a "control" sample having no optical evidence of interactions or morphological disturbances among the group members. The interacting sample consists of 62 galaxies representing 9 different groups, and the control sample contains 40 galaxies representing 6 groups. Of the 91 galaxy and galaxy pairs observed, 74 were detected, while upper limits were placed on the remaining 17 objects. These homogeneous H I data, which will be used in future analyses, provide comparative information on the H I content of groups and serve as a probe of the vicinity of the target spirals for H I clouds or very low surface brightness gas-rich galaxies.

Key words: galaxies: distances and redshifts -- galaxies: general -- galaxies: interactions -- galaxies: ISM -- radio lines: galaxies

Offprint request: W. van Driel, wim.vandriel@obspm.fr

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