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Title:
Population III.1 stars: formation, feedback and evolution of the IMF
Authors:
Tan, Jonathan C.
Affiliation:
AA(Dept. of Astronomy, University of Florida, Gainesville, FL 32611, USA )
Publication:
Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 255, p. 24-32
Publication Date:
12/2008
Origin:
CUP
Keywords:
stars: formation, galaxies: formation, dark matter, cosmology: theory
DOI:
10.1017/S174392130802454X
Bibliographic Code:
2008IAUS..255...24T

Abstract

I discuss current theoretical expectations of how primordial, Pop III.1 stars form. Lack of direct observational constraints makes this a challenging task. In particular predicting the mass of these stars requires solving a series of problems, which all affect, perhaps drastically, the final outcome. While there is general agreement on the initial conditions, H2-cooled gas at the center of dark matter minihalos, the subsequent evolution is more uncertain. In particular, I describe the potential effects of dark matter annihilation heating, fragmentation within the minihalo, magnetic field amplification, and protostellar ionizing feedback. After these considerations, one expects that the first stars are massive ≳100Mȯ, with dark matter annihilation heating having the potential to raise this scale by large factors. Higher accretion rates in later-forming minihalos may cause the Pop III.1 initial mass function to evolve to higher masses.
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