2001MNRAS.327.1237M

Query : 2001MNRAS.327.1237M

2001MNRAS.327.1237M - Mon. Not. R. Astron. Soc., 327, 1237-1243 (2001/November-2)

Further constraints on variation of the fine-structure constant from alkali-doublet QSO absorption lines.

MURPHY M.T., WEBB J.K., FLAMBAUM V.V., PROCHASKA J.X. and WOLFE A.M.

Abstract (from CDS):

Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We constrain variation in α in 21 Keck/HIRES Siiv absorption systems using the alkali-doublet (AD) method in which changes in α are related to changes in the doublet spacing. The precision obtained with the AD method has been increased by a factor of 3: Δα/α=(-0.5±1.3)×10^-5. We also analyse potential systematic errors in this result. Finally, we compare the AD method with the many-multiplet method, which has achieved an order of magnitude greater precision, and we discuss the future of the AD method.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): atomic data - line: profiles - techniques: spectroscopic - quasars: absorption lines - ultraviolet: general

CDS comments: Table 2: QSO 0201+36, 2206-20, 2231-00 not identified

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PHL 957 QSO 01 03 11.2741573824 +13 16 17.809871484   16.97 16.57     ~ 350 0
2 6C 014940+333547 QSO 01 52 34.5766588080 +33 50 33.159720264   18.5 18.5     ~ 134 1
3 QSO B0347-383 QSO 03 49 43.6603590912 -38 10 30.825444900     17.3     ~ 196 0
4 QSO B1759+7539 BLL 17 57 46.3590423768 +75 39 16.181909928     16.50     ~ 90 0
5 QSO B2348-147 BLL 23 51 29.8153792680 -14 27 56.840819544     16.9     ~ 81 1

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