|
| | | | |
| | | |
| Stat |
Members: 3662
Articles: 2'599'751
Articles rated: 2609
11 December 2024 |
|
| | | | |
|
Article overview
| |
|
|
Revised Primordial Helium Abundance Based on New Atomic Data | | M. Peimbert
; V. Luridiana
; A. Peimbert
; | | Date: |
19 Jan 2007 | | Abstract: | We have derived a primordial helium abundance of Yp = 0.2474 +- 0.0028, 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 0.0083, 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. | | Source: | arXiv, astro-ph/0701580 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
|
| |
|
|
|
REGISTER