H I deficiency in the Coma I cloud of galaxies

Details H I deficiency in the Coma I cloud of galaxies H I deficiency in the Coma I cloud of galaxies

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..705g&link_type=abstract

Astronomy and Astrophysics 288, 705-712 (1994)

Astronomy and Astrophysics

Astrophysics

21

Galaxies: Clusters: Coma I Group, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Intergalactic Matter, Galaxies: Interstellar Matter, Radio Lines: Galaxies

Scientific paper

We present new H I observations of galaxies in the Coma I group. Of the 32 most probable members of the group, 16 are gas poor and 16 have normal H I contents. The 16 gas poor galaxies include 4 ellipticals, 5 S0s, and 7 spirals with a definite H I deficiency (more than a factor of four). Most of the 16 gas poor or H I deficient galaxies are concentrated within a radius of 500 kpc of a centroid near the galaxy NGC 4274, suggesting that this region contains a compact core of intergalactic matter that has stripped the gas from some of the galaxies. Seven gas poor galaxies are even within a projected radius of 130 kpc of this position. This possible existence of a dense core of intragroup gas may explain the large H I deficiency in the barred spiral NGC 4314. which has 100 times less H I mass than would be expected from its luminosity and stellar mass. In this galaxy the gas is 99% molecular, 1% atomic and nearly all in the central region. We suspect the extreme H I deficiency in NGC 4314 is due to two distinct causes: ram pressure stripping of the gas in its outer parts, plus action of its bar or an ancient tidal interaction with another galaxy that transferred gas from the inner parts of NGC 4314 to the center where H I was converted to H_2_.

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