Most precise single redshift bound to Delta alpha/alpha

Details Most precise single redshift bound to Delta alpha/alpha Most precise single redshift bound to Delta alpha/alpha

2005-11-28

arxiv.org/abs/astro-ph/0511765v1

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, 8 tables; accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20053827

Verification of theoretical predictions of an oscillating behavior of the fine-structure constant alpha with cosmic time requires high precision Delta alpha/alpha measurements at individual redshifts, while in earlier studies the mean Delta alpha/alpha values averaged over wide redshift intervals were usually reported. This requirement can be met via the single ion differential alpha measurement (SIDAM) procedure proposed in Levshakov et al. (2005). We apply the SIDAM to the FeII lines associated with the damped Ly-alpha system observed at z=1.15 in the spectrum of HE0515-4414. The weighted mean calculated on base of carefully selected 34 FeII pairs {1608,X} (X = 2344, 2374, and 2586 A) is = (-0.07+/-0.84) 10^{-6} (1sigma C.L.). The precision of this estimate improves by a factor 2 the previous one reported for the same system by Quast et al. (2004). The obtained result represents an absolute improvement with respect to what has been done in the measurements of Delta alpha/alpha.

Affiliated with

Also associated with

No associations

Rating

Most precise single redshift bound to Delta alpha/alpha does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Most precise single redshift bound to Delta alpha/alpha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Most precise single redshift bound to Delta alpha/alpha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-25138