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The formation of the first galaxies and the transition to low-mass star formation

Published online by Cambridge University Press:  01 June 2008

T. H. Greif ,
D. R. G. Schleicher ,
J. L. Johnson ,
A.-K. Jappsen ,
R. S. Klessen ,
P. C. Clark ,
S. C. O. Glover ,
A. Stacy  and
V. Bromm
T. H. Greif
Affiliation:
Institut für theoretische Astrophysik, Albert-Ueberle Strasse 2, 69120 Heidelberg, Germany Department of Astronomy, University of Texas, Austin, TX 78712, USA
D. R. G. Schleicher
Affiliation:
Institut für theoretische Astrophysik, Albert-Ueberle Strasse 2, 69120 Heidelberg, Germany
J. L. Johnson
Affiliation:
Department of Astronomy, University of Texas, Austin, TX 78712, USA
A.-K. Jappsen
Affiliation:
School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA, UK
R. S. Klessen
Affiliation:
Institut für theoretische Astrophysik, Albert-Ueberle Strasse 2, 69120 Heidelberg, Germany
P. C. Clark
Affiliation:
Institut für theoretische Astrophysik, Albert-Ueberle Strasse 2, 69120 Heidelberg, Germany
S. C. O. Glover
Affiliation:
Institut für theoretische Astrophysik, Albert-Ueberle Strasse 2, 69120 Heidelberg, Germany Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
A. Stacy
Affiliation:
Department of Astronomy, University of Texas, Austin, TX 78712, USA
V. Bromm
Affiliation:
Department of Astronomy, University of Texas, Austin, TX 78712, USA
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Abstract

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The formation of the first galaxies at redshifts z ~ 10−15 signaled the transition from the simple initial state of the universe to one of ever increasing complexity. We here review recent progress in understanding their assembly process with numerical simulations, starting with cosmological initial conditions and modelling the detailed physics of star formation. In this context we emphasize the importance and influence of selecting appropriate initial conditions for the star formation process. We revisit the notion of a critical metallicity resulting in the transition from primordial to present-day initial mass functions and highlight its dependence on additional cooling mechanisms and the exact initial conditions. We also review recent work on the ability of dust cooling to provide the transition to present-day low-mass star formation. In particular, we highlight the extreme conditions under which this transition mechanism occurs, with violent fragmentation in dense gas resulting in tightly packed clusters.

Keywords

cosmology: theorygalaxies: formationgalaxies: high-redshiftISM: HII regionsgalaxies: intergalactic mediumstars: formationISM: supernova remnants
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 33 - 48
Copyright
Copyright © International Astronomical Union 2008

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