Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-08
Astron.Astrophys. 399 (2003) 433-440
Astronomy and Astrophysics
Astrophysics
7 pages, accepted for Astronomy and Astrophysics on 8 Nov. 2002; new references added on 23 Dec. 2002
Scientific paper
10.1051/0004-6361:20021684
21 cm HI line observations were made with the Arecibo Gregorian telescope of 9 HI clouds in the Hercules Cluster which were reported as tenative detections in a VLA HI 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 HI detections were not reconfirmed by the Arecibo HI measurements. The CCD images did reveal faint, low surface brightness counterparts near the centres of two other VLA HI sources invisible on the Palomar Sky Survey, sw-103 and sw-194.
Balkowski Ch.
Cayatte Veronique
Dickey John M.
Driel Willem van
Duc Pierre-Alain
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