• Interpretation of the global anisotropy in the radio polarizations of cosmologically distant sources

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    • Keywords


      Polarization; magnetic fields; galaxies: active; galaxies: high-redshift; cosmology: miscellaneous; elementary particles

    • Abstract


      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$$|RM - \overline {RM} | > 6rad/m^2 $$, whereRM is the rotation measure and$$\overline {RM} $$ 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 theRM dependent cut. Finally we argue that an anisotropic background pseudoscalar field can explain the observations.

    • Author Affiliations


      Pankaj Jain1 S. Sarala2

      1. Physics Department, Indian Institute of Technology, Kanpur - 208 016, India
      2. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune University Campus, Post Bag 3, Pune - 411 007, India
    • Dates

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