A study of neutral hydrogen in five small galaxy groups

Details A study of neutral hydrogen in five small galaxy groups A study of neutral hydrogen in five small galaxy groups

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324..859b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 4, pp. 859-876.

Astronomy and Astrophysics

Astronomy

9

Galaxies: Evolution, Galaxies: Interactions, Radio Lines: Galaxies

Scientific paper

High-resolution Hi imaging observations of a heterogeneous sample of small galaxy groups are presented. The five galaxy groups studied show a broad range of individual Hi properties: e.g. loose groups surrounding LGG 138 and the genuinely compact LGG 455 are identified; a massive ring of neutral gas is discovered encircling two luminous galaxies in the LGG 138 group; a galaxy-sized mass of Hi is found in LGG 455 confined to an extragalactic cloud which exceeds the threshold density for star formation, yet is optically invisible; and the CCG 1 group is argued to be a chance alignment of Centaurus cluster galaxies. Global results of the study are that the deficit of Hi flux in synthesis imaging data compared with single-dish data is put forward as a quantitative measure of the diffuseness of neutral gas in galaxy groups; several groups contain gas-poor galaxies that ordinarily would contain detectable quantities of Hi - this is interpreted as being caused by an increased chance of gas-sweeping collisions in the group environment; and some evidence is found to support previous findings that compact groups preferentially occur in loose systems.

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