Interpretation of the Global Anisotropy in the Radio Polarizations of Cosmologically Distant Sources

Details Interpretation of the Global Anisotropy in the Radio Polarizations of Cosmologically Distant Sources Interpretation of the Global Anisotropy in the Radio Polarizations of Cosmologically Distant Sources

2003-09-29

arxiv.org/abs/astro-ph/0309776v2

J.Astrophys.Astron.27:443-454,2006

Astronomy and Astrophysics

Astrophysics

13 pages, 6 figures

Scientific paper

10.1007/BF02709370

We present a detailed statistical study of the observed anisotropy in radio polarizations from distant extragalactic objects. This anisotropy was earlier found by Birch (1982) and reconfirmed by Jain and Ralston (1999) in a larger data set. A very strong signal was seen after imposing the cut $|RM-\bar{RM}|>6$ rad/m$^2$, where $RM$ is the rotation measure and $\bar{RM}$ its mean value. In this paper we show that there are several indications that this anisotropy cannot be attributed to bias in the data. We also find that a generalized statistic shows a very strong signal in the entire data without imposing the RM dependent cut. Finally we argue that an anisotropic background pseudoscalar field can explain the observations.

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