Testing the Cosmological Principle in the radio sky

Carlos A. P. Bengaly, Roy Maartens, Nandrianina Randriamiarinarivo, Albert Baloyi

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Abstract

The Cosmological Principle states that the Universe is statistically isotropic and homogeneous on large scales. In particular, this implies statistical isotropy in the galaxy distribution, after removal of a dipole anisotropy due to the observer's motion. We test this hypothesis with number count maps from the NVSS radio catalogue. We use a local variance estimator based on patches of different angular radii across the sky and compare the source count variance between and within these patches. In order to assess the statistical significance of our results, we simulate radio maps with the NVSS specifications and mask. We conclude that the NVSS data is consistent with statistical isotropy.
Original languageEnglish
Article number025
Number of pages10
JournalJournal of Cosmology and Astroparticle Physics
Volume09
DOIs
Publication statusPublished - 13 Sep 2019

Keywords

  • astro-ph.CO
  • gr-qc
  • RCUK
  • STFC
  • ST/S000550/1

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