| Issue |
A&A
Volume 423, Number 1, August III 2004
|
|
|---|---|---|
| Page(s) | 183 - 188 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20047141 | |
| Published online | 29 July 2004 | |
A mushroom-shaped structure from the impact of a cloud with the Galactic disk*
Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada e-mail: kudoh@astro.uwo.ca
Received:
26
January
2004
Accepted:
3
May
2004
We propose that the mushroom-shaped structure of the Galactic worm
GW 123.4-1.5 is created by a cloud collision with the Galactic
gas disk.
A hydrodynamic simulation shows
that a mushroom-shaped structure is created after the cloud
crosses the Galactic midplane. The lifetime of the mushroom-shaped
structure is of order the dynamical time scale of the disk,
years. We find that the velocities across the cap
of the mushroom-shaped structure in the simulation are consistent
with the observed values. The simulation also predicts a structure
on the opposite side of the Galactic plane which is created by
the Kelvin-Helmholtz instability after the cloud passes
through the disk.
Key words: Galaxy: structure / ISM: clouds / ISM: individual: GW 123.4-1.5 / ISM: structure
© ESO, 2004
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