Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1939d&link_type=abstract
Astronomical Journal v.113, p.1939
Astronomy and Astrophysics
Astronomy
32
Galaxies: Clusters: Individual: Hercules, Radio Lines: Galaxies, Galaxies: Ism, Ism: Molecules
Scientific paper
This paper presents results from a survey of λ21-cm emission from galaxies in the Hercules Cluster, A215l and A2147. Four VLA primary beam areas were covered, a total area of 0.9 square degrees, including some 120 spiral galaxies brighter than 17.5m The velocity resolution is 44 km s-1, the angular resolution 25". The detection threshold at field center is 2.6×108h-2 Msun in H I mass or about 1.8×1020 cm-2 in column density. There are 61 galaxies detected in H I, of which about 25 had been previously detected at λ21-cm. About ten of the detections correspond to galaxies that are very faint in the optical, mE≥18 or M≥-17m-5 log h. Some of these low surface brightness galaxies have very extended H I disks, with r≥15 kpc. The abundance of H I is a strong function of position in the cluster, with galaxies in the south and west showing hardly any gas, and galaxies in the north and east of A2151 frequently having massive, extended gas disks. The morphology of the remnants of gas in galaxies in the south and west suggests that the intracluster medium is responsible for their H I deficiency, but there are also several dramatic galaxy mergers in progress.
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