Non-confirmation of reported H I clouds without optical counterparts in the Hercules cluster

DOI: 
Publication date: 
01/01/2003
Main author: 
Van Driel W.
IAA authors: 
Vílchez, J.M.
Authors: 
Van Driel W., O'Neil K., Cayatte V., Duc P.-A., Dickey J.M., Balkowski C., Hernández H., Iglesias-Páramo J., Papaderos P., Vílchez J.M., Thuan T.X.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
399
Pages: 
433-439
Number: 
Abstract: 
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 1997) 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.
Database: 
SCOPUS
Keywords: 
Galaxies: clusters: general; Galaxies: clusters: individual: Hercules cluster; Galaxies: ISM; Radio lines: galaxies