Revised Primordial Helium Abundance Based on New Atomic Data

Details Revised Primordial Helium Abundance Based on New Atomic Data Revised Primordial Helium Abundance Based on New Atomic Data

2007-01-19

arxiv.org/abs/astro-ph/0701580v2

Astrophys.J.666:636-646,2007

Astronomy and Astrophysics

Astrophysics

35 pages, 1 figure. AAS LaTeX. Accepted for publication in the Astrophysical Journal. The accepted version is more explicit in

Scientific paper

10.1086/520571

We have derived a primordial helium abundance of Yp = 0.2477 +- 0.0029, based on new atomic physics computations of the recombination coefficients of He I and of the collisional excitation of the H I Balmer lines together with observations and photoionization models of metal-poor extragalactic H II regions. The new atomic data increase our previous determination of Yp by 0.0086, a very significant amount. By combining our Yp result with the predictions made by the standard Big Bang nucleosynthesis model, we find a baryon-to-photon ratio, \eta, in excellent agreement both with the \eta value derived by the primordial deuterium abundance value observed in damped Lyman-\alpha systems and with the one obtained from the WMAP observations.

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