{
  "id": "1312.4964",
  "version": "v2",
  "published": "2013-12-17T21:00:20.000Z",
  "updated": "2015-01-06T04:52:35.000Z",
  "title": "The stellar mass function and star formation rate-stellar mass relation of galaxies at z ~ 4 - 7",
  "authors": [
    "Antonios Katsianis",
    "Edoardo Tescari",
    "Stuart Wyithe"
  ],
  "comment": "23 Pages, 13 figures, modified to match accepted version to MNRAS",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We investigate the evolution of the star formation rate-stellar mass relation (SFR-M*) and Galaxy Stellar Mass Function (GSMF) of z ~ 4-7 galaxies, using cosmological simulations run with the smoothed particle hydrodynamics code P-GADGET3(XXL). We explore the effects of different feedback prescriptions (supernova driven galactic winds and AGN feedback), initial stellar mass functions and metal cooling. We show that our fiducial model, with strong energy-driven winds and early AGN feedback, is able to reproduce the observed stellar mass function obtained from Lyman-break selected samples of star forming galaxies at redshift 6 < z < 7. At z ~ 4, observed estimates of the GSMF vary according to how the sample was selected. Our simulations are more consistent with recent results from K-selected samples, which provide a better proxy of stellar masses and are more complete at the high mass end of the distribution. We find that in some cases simulated and observed SFR-M* relations are in tension, and this can lead to numerical predictions for the GSMF in excess of the GSMF observed. By combining the simulated SFR(M*) relationship with the observed star formation rate function at a given redshift, we argue that this disagreement may be the result of the uncertainty in the SFR-M* (Luv-M*) conversion. Our simulations predict a population of faint galaxies not seen by current observations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-12-17T21:00:20.000Z",
      "title": "The stellar mass function and star formation rate${\\bf{-}}$stellar mass relation of galaxies at ${\\bf{z\\sim4-7}}$",
      "abstract": "We investigate the evolution of the star formation rate$-$stellar mass relation (SFR$-{\\rm M}_{\\star}$) and Galaxy Stellar Mass Function (GSMF) of $z\\sim 4-7 $ galaxies, using cosmological simulations run with the smoothed particle hydrodynamics code P-GADGET3(XXL). We explore the effects of different feedback prescriptions (supernova driven galactic winds and AGN feedback), initial stellar mass functions and metal cooling. We show that our fiducial model, with strong energy-driven winds and early AGN feedback, is able to reproduce the observed stellar mass function obtained from UV-selected samples of galaxies at redshift $6\\le z\\le7$. At $z\\sim4$ our simulations are more consistent with recent results from IR-selected samples, which provide a better proxy of stellar masses. Despite this success, there is a tension between simulated and observed (UV) SFR$-{\\rm M}_{\\star}$ relations that leads to a disagreement between the GSMF recovered from simulations and UV observations. By combining the simulated SFR(M$_{\\star}$) relationship with the observed star formation rate function at a given redshift, we argue that this disagreement may be the result of the uncertainty in the observed $L_{\\rm UV}-{\\rm M}_{\\star}$ conversion and in the normalization of the observed SFR$-{\\rm M}_{\\star}$ relation. Our simulations predict a population of faint galaxies not seen by current observations. We find that there is an inconsistency between the observed SFR$-{\\rm M}_{\\star}$ relations based on galaxies selected in the IR and UV at redshift $z \\sim 4-5$. The main reason for this tension is that high redshift surveys assume different dust corrections to recover SFRs. Our simulated SFR(M$_{\\star}$) is more consistent with IR-selected samples of galaxies at all the redshifts considered.",
      "comment": "24 Pages, 14 figures, submitted to MNRAS",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2015-01-06T04:52:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star formation rate",
      "stellar mass relation",
      "particle hydrodynamics code p-gadget3",
      "high redshift surveys assume",
      "galaxy stellar mass function"
    ],
    "publication": {
      "doi": "10.1093/mnras/stv160",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Apr",
      "volume": 448,
      "number": 4,
      "pages": 3001
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1272639,
      "adsabs": "2015MNRAS.448.3001K"
    }
  }
}