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Implications of the Distribution of HI Clouds in the Lower Galactic Halo

Published online by Cambridge University Press:  17 September 2012

H.A. Ford ,
F.J. Lockman  and
N.M. McClure-Griffiths
H.A. Ford
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Mail H39, PO Box 218, Hawthorn, Victoria 3122, Australia. e-mail: [email protected]; Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
F.J. Lockman
Affiliation:
National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA
N.M. McClure-Griffiths
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
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Abstract

We have detected hundreds of HI clouds in the lower Galactic halo within the Galactic All-Sky Survey pilot region, a region spanning 325∘≤ l ≤ 343∘ and |b|≤ 20∘. The motions of these clouds are governed by Galactic rotation, they are seen within the disk and up to heights of 2.5 kpc, and they span a wide range of Galactocentric radii. However, these clouds are not uniformly distributed and appear to be associated with Galactic structures such as spiral arms or superbubbles.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 285 - 289
Copyright
© EAS, EDP Sciences, 2012

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