Carbon-Enhanced Metal-Poor Stars, the Cosmic Microwave Background, and the Stellar IMF in the Early Universe - AstrophysicsReportar como inadecuado




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Abstract: The characteristic mass of stars at early times may have been higher thantoday owing to the cosmic microwave background CMB. This study proposes that1 the testable predictions of this -CMB-IMF- hypothesis are an increase inthe fraction of carbon-enhanced metal-poor CEMP stars with decliningmetallicity and an increase from younger to older populations at a singlemetallicity e.g. disk to halo, and 2 these signatures are already seen inrecent samples of CEMP stars and can be better tested with anticipated data.The expected spatial variation may explain discrepancies of CEMP frequencyamong published surveys. The ubiquity and time dependence of the CMB willsubstantially alter the reconstruction of star formation histories in the LocalGroup and early Universe.



Autor: Jason Tumlinson

Fuente: https://arxiv.org/







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