A protogalaxy in the local supercluster

Details A protogalaxy in the local supercluster A protogalaxy in the local supercluster

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346l...5g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. L5-L7.

Astronomy and Astrophysics

Astronomy

108

Centimeter Waves, Galactic Clusters, Galactic Evolution, Intergalactic Media, Radio Sources (Astronomy), Astronomical Models, Gravitational Collapse, H I Regions, Radial Velocity

Scientific paper

The discovery of an isolated H I cloud at a radial velocity of 1275 km/s is reported. At an assumed distance of 20 Mpc, its diameter is about 200 kpc, and its H I mass about 4 x 10 to the 9th solar mass. Although still incompletely mapped, the velocity field exhibits what appears to be ordered rotation: a slowly rising inner rotation curve is followed by a flat portion at Vmax = 30 km/s. The total mass inferred from the rotation curve is about 2.1 x 10 to the 10th solar mass. There is no evidence of a central mass concentration, nor of a stellar population associated with the object.

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