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Non-confirmation of reported H I clouds without optical counterparts in the Hercules cluster
journal contributionposted on 2023-05-16, 17:00 authored by van Driel, W, O'Neil, K, Cayatte, V, Duc, PA, John DickeyJohn Dickey, Balkowski, C, Hernandez, H, Iglesias-Paramo, J, Papaderos, P, Vilchez, JM, Thuan, TX
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.
Publication titleAstronomy and Astrophysics
Department/SchoolSchool of Natural Sciences
Place of publicationCedex A, France