http://arxiv.org/abs/1905.12378
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 radio 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. We also define different criteria to eliminate patches with masked pixels. In order to assess the statistical significance of our results, we simulate radio maps with the NVSS specifications. We conclude that the NVSS data is consistent with statistical isotropy.
C. Bengaly, R. Maartens, N. Randriamiarinarivo, et. al.
Thu, 30 May 19
48/57
Comments: 10 pages, 7 figures. Comments welcome
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