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Mass Spectrum of a Starburst

Published online by Cambridge University Press:  26 May 2016

Jan Palouš ,
Richard Wünsch  and
Soňa Ehlerová
Jan Palouš
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic
Richard Wünsch
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic
Soňa Ehlerová
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic

Abstract

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The fragmentation of supershells and filaments driven by a superwind in a starburst region produces clumps with a mass spectrum approximated by a power law. Its spectral index is close to −2.3. We present results of computer simulations using the thin shell approximation, which are compared to 3D hydrodynamical simulations with self-gravity using the ZEUS computer code. In a low density medium the fragmentation time-scale is comparable to the collisional time-scale, and consequently collisions change the mass spectra of fragments to less steep values. In high density environments collisional time-scales are much longer and the mass spectrum results from gravitational fragmentation of expanding sheets and filaments.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 318 - 323
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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