Observational evidence for a different IMF in the early Galaxy

Details Observational evidence for a different IMF in the early Galaxy Observational evidence for a different IMF in the early Galaxy

2004-12-16

arxiv.org/abs/astro-ph/0412423v1

Astrophys.J. 625 (2005) 833-847

Astronomy and Astrophysics

Astrophysics

14 pages, 1 color figure, accepted for publication on ApJ

Scientific paper

10.1086/428105

The unexpected high incidence of carbon-enhanced, s-process enriched unevolved stars amongst extremely metal-poor stars in the halo provides a significant constraint on the Initial Mass Function (IMF) in the early Galaxy. We argue that these objects are evidence for the past existence of a large population of intermediate-mass stars, and conclude that the IMF in the early Galaxy was different from the present, and shifted toward higher masses.

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