2005/09/30 by Tim W. Connors, Daisuke Kawata, Jeremy Bailin +2
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Dark galaxy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Lambda #Milky Way #RADIUS #Radiative transfer #Star formation #astro-ph
paper · pdf · doi:10.1086/506519
published as Astrophys.J. 646 (2006) L53-L56 · Accepted by ApJL, 08 Jun 2006. 5 pages, 5 figures, 1 table. LaTeX (emulateapj.cls). File with high resolution images available at http://astronomy.swin.edu.au/~tconnors/publications/ . References added; discussion added to, but conclusions unchanged
arxiv created 2006/06/12 · openalex publication_date 2006/07/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 allsky 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.