Expanding shells in low and high density environments

Details Expanding shells in low and high density environments Expanding shells in low and high density environments

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ap%26ss.284..873p&link_type=abstract

Astrophysics and Space Science, v. 284, Issue 2, p. 873-876 (2003).

Astronomy and Astrophysics

Astrophysics

2

Stars: Formation, Ism: Bubbles, Galaxies: Ism

Scientific paper

The gravitational instability of expanding shells evolving in a homogeneous and static medium is discussed. In the low density environment (n = 1 cm-3), the fragmentation starts in shells with diameters of a few 100 pc and fragment masses are in the range of 5 × 103 - 106 M &sun;. In the high density environment (n = 105 - 107 cm-3), shells fragment at diameters of ˜ 1 pc producing clumps of stellar masses. The mass spectrum in both environments is approximated by a power law dN/dm ˜ m -2.3. This is close to the slope of the stellar IMF. To reproduce the observed mass spectrum of clouds (the spectral index close to ˜ -2.0) we have to assume, that the cloud formation time is independent of the cloud size, similarly to the Jeans unstable medium.

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