The high-velocity clouds and the Magellanic Clouds

Details The high-velocity clouds and the Magellanic Clouds The high-velocity clouds and the Magellanic Clouds

2005-05-31

arxiv.org/abs/astro-ph/0506004v1

Astron.Astrophys. 423 (2004) 895-907

Astronomy and Astrophysics

Astrophysics

28 pages with 23 figures

Scientific paper

10.1051/0004-6361:20040177

From an analysis of the sky and velocity distributions of the high-velocity clouds (HVCs) we show that the majority of the HVCs has a common origin. We conclude that the HVCs surround the Galaxy, forming a metacloud of 300 kpc in size and with a mass of 3 10^9 M_sun, and that they are the product of a powerful ``superwind'' (about 10^58 ergs), which occurred in the Magellanic Clouds about 570 Myr ago as a consequence of the interaction of the Large and Small Magellanic Clouds. The HVCs might be magnetic bubbles of semi-ionized gas, blown from the Magellanic Clouds around 570 Myr ago, that circulate largely through the halo of the Galaxy as a stream or flow of gas.

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