Triggered star formation in expanding shells

Abstract

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.

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

References in corpus (2)

• UV Observations of the Powering Source of the Supergiant Shell in IC2574
• Gravitational instability of expanding shells: Solution with nonlinear terms

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• Self-enrichment of Galactic halo globular clusters: stimulated star formation and consequences for the halo metallicity distribution
• Comparing the Inner and Outer Star Forming Complexes in the Nearby Spiral Galaxies NGC 628, NGC 5457 and NGC 6946 using UVIT Observations
• The $\text{Gaia}$ view of the Cepheus OB2 association
• The triggered star formation in rotating disks