Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..535r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 535-550.
Astronomy and Astrophysics
Astronomy
19
Hydrogen Clouds, Intergalactic Media, Neutral Gases, Particle Collisions, Galactic Structure, Quasars, Radial Velocity, Radio Sources (Astronomy)
Scientific paper
Evidence is presented to test the hypothesis that the intergalactic H I cloud in Leo is a nearly freely expanding product of a Spitzer-Baade (gas-sweeping) collision between two galaxies (NGC 3368 and NGC 3384) in GWa. A controlled experiment identifies the two colliders. The galaxies are identified by an a priori selection criterion among a well-defined sample of seven galaxies and lie at equal angular distances on either side of the center of the cloud. Traces of two optical rings in NGC 3368 and a spiral arm in NGC 3384 are observed. These features are found in computer-simulated collisions by Theys and Spiegel (1977) and Toomre (1978). A one-arm filament in NGC 3368 which extends in the direction of the H I cloud corresponds to features expected from gas-sweeping and tidal interactions of colliding galaxies. Based on observational data, a simple physical model of the gas-sweeping collision event is constructed.
Rood Herbert J.
Williams Barbara A.
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