A huge H I cloud near a galaxy pair

Details A huge H I cloud near a galaxy pair A huge H I cloud near a galaxy pair

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388l...5h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 388, March 20, 1992, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

8

H I Regions, Interacting Galaxies, Spiral Galaxies, Virgo Galactic Cluster, Astronomical Spectroscopy, Dark Matter, Emission Spectra, Galactic Structure, Mass Distribution

Scientific paper

NGC 4532 and DDO 137 are a pair of Sm galaxies near the edge of the Virgo Cluster. Arecibo observations of a nearby H I cloud of enormous extent and unusual velocity structure are reported. The overall diameter of the cloud is almost 30 arcmin (about 200 kpc). Emission near the two galaxies in both position and velocity accounts for about 80 percent of the total H I mass of 2.1 x 10 exp 10 solar. The remaining extended emission is mainly at lower velocity; none of the extended emission appears at velocities higher than the systemic velocity of the pair. The kinematics of the extended cloud are too complex for a unique dynamic interpretation of the system; however, the 'indicative dynamic mass' is of order 10 exp 12 solar.

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