{
  "id": "1604.01314",
  "version": "v1",
  "published": "2016-04-05T16:08:42.000Z",
  "updated": "2016-04-05T16:08:42.000Z",
  "title": "On the faint-end of the high-$z$ galaxy luminosity function",
  "authors": [
    "Bin Yue",
    "Andrea Ferrara",
    "Yidong Xu"
  ],
  "comment": "11 pages, 13 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "Recent measurement of the Luminosity Function (LF) of galaxies in the Epoch of Reionization (EoR, redshift $z>6$) indicates a very steep increase of the number density of low-mass galaxies populating the LF faint-end. As star formation in such systems can be easily quenched by radiative feedback effects, a turn-off is expected at some faint magnitude. Using a physically-motivated analytical model, we quantify reionization feedback effects on the LF. If reionization feedback is neglected, the power-law Schechter parameterization characterizing the faint-end of the LF remains valid up to $M_{\\rm UV}\\sim -9$. If (strong) feedback is included, the LF drops above $M_{\\rm UV} \\sim -15$, slightly below the detection limit of current surveys at $z\\sim5$. However, the LF may rise again at higher $M_{\\rm UV}$ as a result of the interplay between reionization topology and photo-evaporation physics. Moreover, we find that the stellar age -- magnitude relation might be used as a probe of feedback strength as well: in models with stronger reionization feedback, stars in galaxies with $-13 \\lsim M_{\\rm UV} \\lsim -8$ are typically older. Other suggested constraints on feedback can come from galaxy number counts data, particularly those exploiting gravitational lensing magnification.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-04-05T16:08:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galaxy luminosity function",
      "galaxy number counts data",
      "stronger reionization feedback",
      "quantify reionization feedback effects",
      "power-law schechter parameterization"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160401314Y",
      "inspire": 1442335
    }
  }
}