Triggered star formation in expanding shells

Details Triggered star formation in expanding shells Triggered star formation in expanding shells

2001-11-27

arxiv.org/abs/astro-ph/0111495v1

Mon.Not.Roy.Astron.Soc. 330 (2002) 1022

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted by MNRAS; see also astro-ph/0105530, astro-ph/0106010

Scientific paper

10.1046/j.1365-8711.2002.05156.x

We discuss fragmentation processes which induce star formation in dense walls of expanding shells. The influence of the energy input, the ISM scale-height and speed of sound in the ambient medium is tested. We formulate the condition for the gravitational fragmentation of expanding shells: if the total surface density of the disc is higher than a certain critical value, shells are unstable. The value of the critical density depends on the energy of the shell and the sound speed in the ISM.

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