Volume 399, Number 2, February IV 2003
|Page(s)||433 - 439|
|Section||Cosmology (including clusters of galaxies)|
|Published online||07 February 2003|
Non-confirmation of reported clouds without optical counterparts in the Hercules cluster
Observatoire de Paris, Section de Meudon, GEPI, CNRS UMR 8111, 5 place Jules Janssen, 92195 Meudon, France e-mail: email@example.com;firstname.lastname@example.org;email@example.com
2 Arecibo Observatory, HC3 Box 53995, Arecibo, Puerto Rico 00612, USA e-mail: firstname.lastname@example.org;email@example.com
3 CNRS URA 2052 and CEA, DSM, DAPNIA, Service d'Astrophysique, Centre d'Études de Saclay, 91911 Gif-sur-Yvette Cedex, France e-mail: firstname.lastname@example.org
4 Department of Astronomy, University of Minnesota, Minneapolis, USA e-mail: email@example.com
5 Laboratoire d'Astrophysique de Marseille, Traverse du Siphon – Les Trois Lucs, 13376 Marseille, France e-mail: firstname.lastname@example.org
6 Universitäts-Sternwarte, Geismarlandstrasse 11, 37083 Göttingen, Germany e-mail: email@example.com
7 Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain e-mail: firstname.lastname@example.org
8 Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA e-mail: email@example.com
Corresponding author: W. van Driel, firstname.lastname@example.org
Accepted: 7 November 2002
21 cm H i line observations were made with the Arecibo Gregorian telescope of 9 H i clouds in the Hercules Cluster which were reported as tentative detections in a VLA H i study of the cluster (Dickey [CITE]) and for which our deep CCD imaging failed to find any optical counterparts. No sensitive observations could be made of one of these (sw-174) due to the presence of a close-by strong continuum source. The other 8 tentative H i detections were not confirmed by the Arecibo H i measurements. The CCD images did reveal faint, low surface brightness counterparts near the centres of two other VLA H i sources invisible on the Palomar Sky Survey, sw-103 and sw-194.
Key words: galaxies: clusters: general / galaxies: clusters: individual: Hercules cluster / galaxies: ISM / radio lines: galaxies
© ESO, 2003
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