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Title:
On the Origin of Anomalous Velocity Clouds in the Milky Way
Authors:
Connors, Tim W.; Kawata, Daisuke; Bailin, Jeremy; Tumlinson, Jason; Gibson, Brad K.
Affiliation:
AA(Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, VIC 3122, Australia; .), AB(Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, VIC 3122, Australia; .; Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101.), AC(Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, VIC 3122, Australia; .), AD(Yale Center for Astronomy and Astrophysics, Department of Physics, P.O. Box 208101, New Haven, CT 06520.), AE(Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK.)
Publication:
The Astrophysical Journal, Volume 646, Issue 1, pp. L53-L56. (ApJL Homepage)
Publication Date:
07/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Formation, Galaxies: Intergalactic Medium, Galaxies: Local Group
DOI:
10.1086/506519
Bibliographic Code:
2006ApJ...646L..53C

Abstract

We report that neutral hydrogen (H I) gas clouds, resembling high-velocity clouds (HVCs) observed in the Milky Way (MW), appear in MW-sized disk galaxies formed in high-resolution Lambda cold dark matter (ΛCDM) cosmological simulations that include gas dynamics, radiative cooling, star formation, supernova feedback, and metal enrichment. Two such disk galaxies are analyzed, and H I column density and velocity distributions in all-sky Aitoff projections are constructed. The simulations demonstrate that ΛCDM is able to create galaxies with sufficient numbers of anomalous velocity gas clouds consistent with the HVCs observed within the MW, and that they are found within a galactocentric radius of 150 kpc. We also find that one of the galaxies has a polar gas ring with radius 30 kpc that appears as a large structure of HVCs in the Aitoff projection. Such large structures may have an origin similar to that of extended HVCs observed in the MW, such as Complex C.
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