Bibcode
DOI
Peimbert, Manuel; Luridiana, Valentina; Peimbert, Antonio
Referencia bibliográfica
The Astrophysical Journal, Volume 666, Issue 2, pp. 636-646.
Advertised on:
9
2007
Revista
Número de citas
259
Número de citas referidas
214
Descripción
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.