Volume 557, September 2013
|Number of page(s)||9|
|Section||Cosmology (including clusters of galaxies)|
|Published online||26 August 2013|
Variation of the fine-structure constant: an update of statistical analyses with recent data
1 Grupo de Astrofísica, Relatividad y Cosmología, Facultad de Ciencias Astronómicas y Geofísicas, Universidad de La Plata, Paseo del Bosque S/N, 1900 La Plata, Pcia de Buenos Aires, Argentina
2 Instituto de Física de Buenos Aires, CONICET – Universidad de Buenos Aires, Ciudad Universitaria – Pab. 1, 1428 Buenos Aires, Argentina
3 Departamento de Física, FCEN, UBA, Ciudad Universitaria – Pab. 1, 1428 Buenos Aires, Argentina
Received: 30 April 2013
Accepted: 25 June 2013
Aims. We analyze the consistency of different astronomical data of the variation in the fine-structure constant obtained with Keck and VLT.
Methods. We tested the consistency using the Student test and confidence intervals. We splited the data sets into smaller intervals and grouped them according to redshift and angular position. Another statistical analysis is proposed that considers phenomenological models for the variation in α.
Results. Results show consistency for the reduced intervals for each pair of data sets and suggests that the variation in α is significant at higher redshifts.
Conclusions. Even though the dipole model seems to be the most accurate phenomenological model, the statistical analyses indicate that the variation in α might be depending on both redshift and angular position.
Key words: methods: data analysis / quasars: absorption lines / quasars: emission lines / cosmology: observations
© ESO, 2013
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