On the origin of anomalous velocity clouds in the Milky Way

Details On the origin of anomalous velocity clouds in the Milky Way On the origin of anomalous velocity clouds in the Milky Way

2005-09-13

arxiv.org/abs/astro-ph/0509314v2

Astrophys.J. 646 (2006) L53-L56

Astronomy and Astrophysics

Astrophysics

Accepted by ApJL, 08 Jun 2006. 5 pages, 5 figures, 1 table. LaTeX (emulateapj.cls). File with high resolution images available

Scientific paper

10.1086/506519

We report that neutral hydrogen (HI) 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 (LCDM) cosmological simulations which include gas-dynamics, radiative cooling, star formation, supernova feedback, and metal enrichment. Two such disk galaxies are analyzed, and HI column density and velocity distributions in all-sky Aitoff projections are constructed. The simulations demonstrate that LCDM 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, which appears as a large structure of HVCs in the Aitoff projection. Such large structures may share an origin similar to extended HVCs observed in the MW, such as Complex C.

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