Publication: A mushroom-shaped structure from the impact of a cloud with the Galactic disk

All || By Area || By Year

Title	A mushroom-shaped structure from the impact of a cloud with the Galactic disk
Authors/Editors*	T. Kudoh, S. Basu
Where published*	Astronomy and Astrophysics
How published*	Journal
Year*	2004
Volume	423
Number	183
Pages	6
Publisher
Keywords	Astronomy, Galaxy, Interstellar medium
Link
Abstract	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, ∼ 107 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. Movies materials are only available in electronic form at http://www.edpsciences.org