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The importance of initial conditions and metallicity for the fragmentation of protogalactic gas

Published online by Cambridge University Press:  09 March 2010

Anne-Katharina Jappsen
Affiliation:
School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK email: jappsena@cf.ac.uk
Simon C. O. Glover
Affiliation:
Institut für Theoretische Astrophysik, Universität Heidelberg, 69120 Heidelberg, Germany
Mordecai-Mark Mac Low
Affiliation:
American Museum of Natural History, New York, NY, 10024-5192, USA
Ralf S. Klessen
Affiliation:
Institut für Theoretische Astrophysik, Universität Heidelberg, 69120 Heidelberg, Germany
Corresponding
E-mail address:
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Abstract

The formation of the first stars out of metal-free gas appears to result in stars at least an order of magnitude more massive than in the present-day case. We here consider what controls the transition from a primordial to a modern initial mass function. We study the influence of low levels of metal enrichment and different initial conditions on the cooling and collapse of initially ionized gas in small protogalactic halos using three-dimensional, smoothed particle hydrodynamics simulations. We argue that fragmentation at moderate density depends on the initial conditions for star formation more than on the metal abundances present.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

Bromm, V., Ferrara, A., Coppi, P. S., & Larson, R. B. 2001, MNRAS, 328, 969CrossRefGoogle Scholar
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Jappsen, A.-K., Glover, S. C. O., Klessen, R. S., & Mac Low, M.-M. 2007, ApJ, 660, 1332CrossRefGoogle Scholar
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The importance of initial conditions and metallicity for the fragmentation of protogalactic gas
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