An Extension of the Smith Cloud Stream Toward the Galactic Plane

Details An Extension of the Smith Cloud Stream Toward the Galactic Plane An Extension of the Smith Cloud Stream Toward the Galactic Plane

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541513k&link_type=abstract

American Astronomical Society, AAS Meeting #215, #415.13; Bulletin of the American Astronomical Society, Vol. 42, p.262

Astronomy and Astrophysics

Astronomy

Scientific paper

We have been using the Green Bank Telescope (GBT) at the NRAO to map 21cm HI emissions in a large area around the high-velocity cloud known as the Smith Cloud. Earlier work with the GBT established that the Smith Cloud has a trajectory that puts it on a collision course with the disk of the Milky Way in about 30 Myr at a distance of about 11 kpc from the Galactic Center. However, the earlier data covered only the main piece of the Cloud, and suggested more HI associated with this object might be found over a larger area. The new data cover more than 200 square degrees. We have found evidence for a component of the Smith Cloud that lies further along its trajectory and is crossing the Galactic plane. Detailed information on this new component, its properties, and the implications for the origin and fate of the Smith Cloud will be presented.

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