A Discovery of High Galactic Latitude Halo Clouds

Physics

Scientific paper

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Scientific paper

Preliminary results of HI observations done with the 100m Green Bank Telescope (GBT) in March 2004 will be presented. A region near the Galactic longitude +38 and above the Galactic latitude +11 was observed. It has attracted our attention because it appears to contain a long 'whisker' of HI protruding from the Galactic plane to latitudes of +15 or higher, as based on inspection of the low-resolution Leiden-Dwingeloo HI survey. Results of higher resolution (9 arcmin) observations with the GBT confirm the presence of several correlated hydrogen clouds in the 'whisker' region, some as high as latitude +20. Previous observations with the GBT have shown that HI in the Galactic halo forms cloud-like structures whose velocities appear to be dominated by Galactic rotation, however none were detected this high before. The 'whisker' clouds seem to be situated near the tangent point of Galactic rotation and thus are at a distance of about 7 kpc, with some residing more than 2 kpc from the Galactic plane. Properties of these newly discovered clouds will be discussed.

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