Revised Primordial Helium Abundance Based on New Atomic Data

Bibcode
2007ApJ...666..636P
DOI
10.1086/520571
Peimbert, Manuel; Luridiana, Valentina; Peimbert, Antonio
Bibliographical reference

The Astrophysical Journal, Volume 666, Issue 2, pp. 636-646.

Advertised on:
9
2007
Journal
The Astrophysical Journal
Number of authors
3
IAC number of authors
0
Citations
258
Refereed citations
213
Description
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, η, in excellent agreement both with the η-value derived by the primordial deuterium abundance value observed in damped Lyα systems and with the one obtained from the WMAP observations.
Type
Refereed
Cosmology
Early universe
Galaxies
Galaxies
H II regions

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