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Smith's Cloud: A High-velocity Cloud Colliding with the Milky Way | | Felix J. Lockman
; Robert A. Benjamin
; A. J. Heroux
; Glen I. Langston
; | | Date: |
25 Apr 2008 | | Abstract: | New 21cm HI observations made with the Green Bank Telescope show that the
high-velocity cloud known as Smith’s Cloud has a striking cometary appearance
and many indications of interaction with the Galactic ISM. The velocities of
interaction give a kinematic distance of 12.4 +/-1.3 kpc, consistent with the
distance derived from other methods. The Cloud is >3 x 1 kpc in size and its
tip at (l,b)=(39 deg,-13 deg) is 7.6 kpc from the Galactic center and 2.9 kpc
below the Galactic plane. It has greater than 10^6 M solar masses in HI. Its
leading section has a total space velocity near 300 km/s, is moving toward the
Galactic plane with a velocity of 73+/-26 km/s, and is shedding material to the
Galaxy. In the absence of drag the Cloud will cross the plane in about 27 Myr.
Smith’s Cloud may be an example of the accretion of gas by the Milky Way needed
to explain certain persistent anomalies in Galactic chemical evolution. | | Source: | arXiv, 0804.4155 | | Services: | Forum | Review | PDF | Favorites | |
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