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Testing primordial non-Gaussianities on galactic scales at high redshift.

Abstract : Primordial non-Gaussianities provide an important test of inflationary models. Although the Planck cosmic microwave background experiment has produced strong limits on non-Gaussianity on scales of clusters, there is still room for considerable non-Gaussianity on galactic scales. We have tested the effect of local non-Gaussianity on the high-redshift galaxy population by running five cosmological N-body simulations down to z = 6.5. For these simulations, we adopt the same initial phases, and either Gaussian or scale-dependent non-Gaussian primordial fluctuations, all consistent with the constraints set by Planck on cluster scales. We then assign stellar masses to each halo using the halo-stellar mass empirical relation of Behroozi et al. Our simulations with non-Gaussian initial conditions produce halo mass functions that show clear departures from those obtained from the analogous simulations with Gaussian initial conditions at z ≳ 10. We observe a >0.3 dex enhancement of the low end of the halo mass function, which leads to a similar effect on the galaxy stellar mass function, which should be testable with future galaxy surveys at z > 10. As cosmic reionization is thought to be driven by dwarf galaxies at high redshift, our findings may have implications for the reionization history of the Universe.
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M. Habouzit, T. Nishimichi, S. Peirani, G. A. Mamon, J. Silk, et al.. Testing primordial non-Gaussianities on galactic scales at high redshift.. Mon. Not. R. Astron. Soc., 2014, 445, pp.L129-L133. ⟨10.1093/mnrasl/slu145⟩. ⟨insu-03645244⟩

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