{
  "id": "1407.8192",
  "version": "v2",
  "published": "2014-07-30T20:00:17.000Z",
  "updated": "2014-09-09T13:12:04.000Z",
  "title": "Testing primordial non-Gaussianities on galactic scales at high redshift",
  "authors": [
    "Mélanie Habouzit",
    "Takahiro Nishimichi",
    "Sébastien Peirani",
    "Gary A. Mamon",
    "Joseph Silk",
    "Jacopo Chevallard"
  ],
  "comment": "6 pages, 3 figures, 1 table, MNRAS (Letters) in press",
  "categories": [
    "astro-ph.CO",
    "astro-ph.GA"
  ],
  "abstract": "Primordial non-Gaussianities provide an important test of inflationary models. Although the Planck CMB 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 clusters scales. We then assign stellar masses to each halo using the halo - stellar mass empirical relation of Behroozi et al. (2013). 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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-07-30T20:00:17.000Z",
      "abstract": "The simplest inflationary models predict a very nearly Gaussian distribution of density fluctuations. Primordial non-Gaussianities therefore provide an important test of inflationary models. Although the Planck CMB 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 clusters scales. We then assign stellar masses to each halo using the halo - stellar mass empirical relation of Behroozi et al. (2013). 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 boosting 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.",
      "comment": "6 pages, 3 figures, 1 table, submitted to MNRAS",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-09-09T13:12:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high redshift",
      "testing primordial non-gaussianities",
      "galactic scales",
      "conditions produce halo mass",
      "produce halo mass functions"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnrasl/slu145",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2014,
      "month": "Nov",
      "volume": 445,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1309081,
      "adsabs": "2014MNRAS.445L.129H"
    }
  }
}