The intergalactic H I cloud in Leo - A Spitzer-Baade collision product?

Statistics – Computation

Scientific paper

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Computational Astrophysics, Cosmic Gases, Dwarf Galaxies, Gas Density, Hydrogen Clouds, Intergalactic Media, Elliptical Galaxies, Galactic Evolution, Galactic Nuclei, Spiral Galaxies

Scientific paper

Evidence is presented suggesting that the recently discovered intergalactic H I cloud in Leo is a nearly freely expanding product of a Spitzer-Baade (gas-sweeping) collision between two galaxies in Materne GWa. A controlled experiment plausibly identifies the two colliders as the large spiral galaxy NGC 3368 and the spiral predecessor of NHC 3384. During the collision, the stellar components of the two galaxies passed through each other nearly unaltered but the gas components in the two galactic disks became thoroughly mixed, resulting in a nearly freely expanding intergalactic cloud lying initially between the two galaxies. The collision is inferred to have occurred about 500 million yr ago; the cloud cooled in less than 10 million yr. This mechanism explains in a natural way why no stellar component has been detected in the cloud.

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