| | |
| | |
Stat |
Members: 3645 Articles: 2'501'711 Articles rated: 2609
20 April 2024 |
|
| | | |
|
Article overview
| |
|
D/H in a new Lyman limit quasar absorption system at z=3.256 towards PKS1937-1009 | N. H. M. Crighton
; J. K. Webb
; A. Ortiz-Gil
; A. Fernandez-Soto
; | Date: |
22 Mar 2004 | Journal: | Mon.Not.Roy.Astron.Soc. 355 (2004) 1042 | Subject: | astro-ph | Abstract: | We have identified a new Lyman limit absorption system towards PKS1937-1009, with log N(HI)=18.25 +/- 0.02 at z=3.256. It is suitable for measuring D/H, and we find a 68.3% confidence range for D/H of 1.6^{+0.25}_{-0.30} imes 10^{-5}, and a 95.4% range of 1.6^{+0.5}_{-0.4} imes 10^{-5}. The metallicity of the cloud where D/H was measured is low, [Si/H] = -2.0 +/- 0.5. At these metallicities we expect that D/H will be close to the primordial value. Our D/H disagrees at a level of 99.4% with the predicted D/H using the baryon density calculated from the cosmic background radiation measured by WMAP, 2.60^{+0.19}_{-0.17} imes 10^{-5}. Our result also exacerbates the scatter in D/H values around the mean primordial D/H. | Source: | arXiv, astro-ph/0403512 | 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.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |