Primordial Non-Gaussianity and the NRAO VLA Sky Survey

Details Primordial Non-Gaussianity and the NRAO VLA Sky Survey Primordial Non-Gaussianity and the NRAO VLA Sky Survey

2010-03-17

arxiv.org/abs/1003.3451v2

Astrophys. J. 717:L17,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 5 figures

Scientific paper

10.1088/2041-8205/717/1/L17

The NRAO VLA Sky Survey (NVSS) is the only dataset that allows an accurate determination of the auto-correlation function (ACF) on angular scales of several degrees for Active Galactic Nuclei (AGNs) at typical redshifts $z \simeq 1$. Surprisingly, the ACF is found to be positive on such large scales while, in the framework of the standard hierarchical clustering scenario with Gaussian primordial perturbations it should be negative for a redshift-independent effective halo mass of order of that found for optically-selected quasars. We show that a small primordial non-Gaussianity can add sufficient power on very large scales to account for the observed NVSS ACF. The best-fit value of the parameter $f_{\rm NL}$, quantifying the amplitude of primordial non-Gaussianity of local type is $f_{\rm NL}=62 \pm 27$ ($1\,\sigma$ error bar) and $25

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