Volume 406, Number 2, August I 2003
|Page(s)||453 - 469|
|Published online||17 November 2003|
A study of H I-selected galaxies in the Hercules cluster*
Laboratoire d'Astrophysique de Marseille, Traverse du Siphon – Les Trois Lucs, 13376 Marseille, France e-mail: firstname.lastname@example.org
2 Observatoire de Paris, GEPI, CNRS-UMR 8111 and Université Paris 7, 92195 Meudon Cedex, France e-mail: email@example.com; firstname.lastname@example.org; email@example.com
3 CNRS URA 2052 and CEA, DSM, DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France e-mail: firstname.lastname@example.org
4 Universitäts-Sternwarte, Geismarlandstrasse 11, 37083 Göttingen, Germany e-mail: email@example.com
5 Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain e-mail: firstname.lastname@example.org
6 Arecibo Observatory, HC3 Box 53995, Arecibo, Puerto Rico 00612, USA e-mail: email@example.com, firstname.lastname@example.org
7 Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA e-mail: email@example.com
8 Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA e-mail: firstname.lastname@example.org
Corresponding author: J. Iglesias-Páramo, email@example.com
Accepted: 9 April 2003
The present study focuses on a sample of 22 galaxies detected in the blind VLA H i survey of the Hercules cluster by Dickey ([CITE]), 18 of which were selected on an H i line width smaller than 270 km s-1 and 4 others with only tentative optical counterparts in the Palomar Sky Survey. Sensitive single-dish H i line spectra were obtained for 20 of them, and for one the VLA detection was not confirmed. Optical surface photometry has been carried out for 10 objects, for 8 of which optical spectroscopy was obtained as well. Based on various criteria, we classify two sample galaxies (ce-143 and ne-204) as genuine dwarfs whereas the remaining sample objects are found to be intrinsically luminous galaxies. For those objects investigated in optical wavelengths we determine properties similar to those of actively star-forming galaxies, and find that approximately one half of them has properties intermediate between those of dwarf galaxies and low-luminosity disc galaxies. No optical redshifts could be determined for two of the galaxies (sw-103 and sw-194) and their physical association with the H i clouds detected at their positions therefore remains uncertain. A particularly interesting object in our sample is the Tidal Dwarf Galaxy candidate ce-061 in the galaxy merger IC 1182.
Key words: galaxies: abundances / galaxies: dwarf / galaxies: clusters: general / galaxies: clusters: individual: Hercules cluster
© ESO, 2003
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