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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2003

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

Résumé

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{Dickey97}) 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.

Dates et versions

hal-03796969 , version 1 (04-10-2022)

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Citer

Willem van Driel, K. O'Neil, Véronique Cayatte, Pierre-Alain Duc, J. M. Dickey, et al.. Non-confirmation of reported HI clouds without optical counterparts in the Hercules cluster. Astronomy and Astrophysics - A&A, 2003, 399, pp.433-439. ⟨10.1051/0004-6361:20021684⟩. ⟨hal-03796969⟩
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