Distribution and motions of atomic hydrogen in lenticular galaxies. IV - A ring of H I around NGC 4262

Details Distribution and motions of atomic hydrogen in lenticular galaxies. IV - A ring of H I around NGC 4262 Distribution and motions of atomic hydrogen in lenticular galaxies. IV - A ring of H I around NGC 4262

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..202k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 202-210. Research supported by the Nederlandse Orga

Astronomy and Astrophysics

Astrophysics

27

Barred Galaxies, Galactic Structure, Gas Dynamics, Hydrogen Atoms, Interstellar Gas, Astronomical Maps, Mass To Light Ratios, Photographic Plates, Radial Distribution, Virgo Galactic Cluster

Scientific paper

The distribution of H I in the normal, barred lenticular galaxy NGC 4262 in the Virgo Cluster has been mapped at a resolution of 13arcsec×51arcsec. The gas is confined to a narrow ring, apparently in circular rotation about the galaxy center. The ring has a diameter about twice the optical diameter of the galaxy, and is inclined by at least 50° (and possibly as much as 120°) to the optical disk. The rotation velocity of the ring implies that atomic hydrogen accounts for far less than 1% of the total mass, and that the total mass-to-light ratio is near 20. The local mass-to-light ratio in the ring is at least 50 to 80, giving evidence for a massive, "invisible" envelope or halo surrounding the galaxy. The authors consider two reasonable explanations for the presence of gas in NGC 4262, namely that it is the remnant of the primordial proto-galaxy cloud, or of a captured, gas-rich dwarf or intergalactic H I cloud.

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