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The Cosmological Principle states that the Universe is statisticallyisotropic and homogeneous on large scales. In particular, this impliesstatistical isotropy in the galaxy distribution, after removal of a dipoleanisotropy due to the observer's motion. We test this hypothesis with numbercount maps from the NVSS radio catalogue. We use a local variance estimatorbased on patches of different angular radii across the sky and compare thesource count variance between and within these patches. In order to assess thestatistical significance of our results, we simulate radio maps with the NVSSspecifications and mask. We conclude that the NVSS data is consistent withstatistical isotropy.

Testing the Cosmological Principle in the radio sky