The Distribution of Disk-Halo Clouds in the Inner Milky Way

Details The Distribution of Disk-Halo Clouds in the Inner Milky Way The Distribution of Disk-Halo Clouds in the Inner Milky Way

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642407l&link_type=abstract

American Astronomical Society, AAS Meeting #216, #424.07; Bulletin of the American Astronomical Society, Vol. 41, p.837

Astronomy and Astrophysics

Astronomy

Scientific paper

Using 21cm HI data from the Parkes Galactic All-Sky Survey we have measured the distribution of 255 HI clouds in the disk-halo transition at the tangent points in the first quadrant of longitude (QI) of the Milky Way. The sample is taken from an area symmetric about longitude zero to a region examined previously in the fourth longitude quadrant (QIV). The two samples were obtained from data taken with the identical instrument, sensitivity and selection criteria, allowing an accurate comparison to be made between QI and QIV. Individual clouds are found to have identical properties in the two quadrants, with a median mass of about 650 Mo and a median distance from the plane of 600 pc. The cloud-cloud velocity dispersion is also identical, with a value of 16 km/s. However, there are more than 3 times the number of clouds in QI as in QIV, and their scale height is twice as large. We attribute this major asymmetry to the formation of the clouds in the spiral arms of the Galaxy, likely from the shattered walls of superbubbles. The cloud-cloud velocity dispersion cannot produce the scale height of the clouds, and indeed, cannot even be connected with their vertical distribution. The NRAO is operated by Associated Universities, Inc., under a cooperative agreement with the National Science Foundation.

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