THE SMITH CLOUD : A HIGH-VELOCITY CLOUD COLLIDING WITH THE MILKY WAY

@article{Lockman2008THESC,
  title={THE SMITH CLOUD : A HIGH-VELOCITY CLOUD COLLIDING WITH THE MILKY WAY},
  author={Felix J. Lockman and Robert A. Benjamin and A. J. Heroux and Glen I. Langston},
  journal={The Astrophysical Journal},
  year={2008},
  volume={679}
}
New 21 cm H I observations made with the Green Bank Telescope show that the high-velocity cloud known as the Smith Cloud has a striking cometary appearance and many indications of interaction with the Galactic interstellar medium. 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 × 1 kpc in size, and its tip at (l, b) ≈ 39°, –13° is 7.6 kpc from the Galactic center and 2.9 kpc below the Galactic… Expand
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References

SHOWING 1-10 OF 27 REFERENCES
High-Velocity Cloud Complex H: A Satellite of the Milky Way in a Retrograde Orbit?
Observations with the Green Bank Telescope of 21 cm H I emission from the high-velocity cloud complex H suggest that it is interacting with the Milky Way. A model in which the cloud is a satellite of… Expand
Distances to Galactic High-Velocity Clouds. I. Cohen Stream, Complex GCP, Cloud g1
The high- and intermediate-velocity interstellar clouds (HVCs/IVCs) are tracers of energetic processes in and around the Milky Way. Clouds with near-solar metallicity about 1 kpc above the disk trace… Expand
An Interaction of a Magellanic Leading Arm High-Velocity Cloud with the Milky Way Disk
The Leading Arm of the Magellanic system is a tidally formed H I feature extending ~60° from the Magellanic Clouds ahead of their direction of motion. Using atomic hydrogen (H I) data from the… Expand
A Gigantic Eruption from the Inner Disk of the Milky Way
While studying extraplanar neutral hydrogen in the disk-halo transition of the inner Galaxy, we have discovered what appears to be a huge superbubble centered around l ≈ 30°, whose top extends to… Expand
H I Jet G40-15 from a Rotating Cloud in the 4-kpc Molecular Ring: Magnetized Outflow and Formation of a Dense Star Cluster
A giant H I spur centered on (l, b) = (40◦,−15◦), (G40−15) emanates from G30−00 toward negative high latitude. The spur is known as the Smith cloud and as a high-velocity cloud HVC 40−15+100, while… Expand
High-Velocity Clouds: Building Blocks of the Local Group
We suggest that the high-velocity clouds (HVCs) are large clouds, with typical diameters of 25 kpc, containing 3×107 M☉ of neutral gas and 3×108 M☉ of dark matter, falling onto the Local Group;… Expand
High-Velocity Rain: The Terminal Velocity Model of Galactic Infall
A model is proposed for determining the distances to falling interstellar clouds in the galactic halo by measuring the cloud velocity and column density and assuming a model for the vertical density… Expand
Hα Emission from High-Velocity Clouds and Their Distances
We present deep Hα spectroscopy toward several high-velocity clouds (HVCs), which vary in structure from compact HVCs (CHVCs) to the Magellanic Stream. The clouds range from being bright (~640 mR) to… Expand
An Accurate Distance to High-Velocity Cloud Complex C
We report an accurate distance of -->d = 10 ? 2.5 kpc to the high-velocity cloud Complex C. Using high signal-to-noise ratio Keck HIRES spectra of two horizontal-branch stars, we have detected Ca II… Expand
The Smith cloud: H i associated with the Sgr dwarf?
ABSTRA C T The Smith high-velocity cloud (VLSR o 98 km s π1 ) has been observed at two locations in the emission lines [O III]l5007, [N II]l6548 and Ha. Both the [N II] and Ha profiles show bright… Expand
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