{
  "id": "1409.0263",
  "version": "v1",
  "published": "2014-08-31T20:27:44.000Z",
  "updated": "2014-08-31T20:27:44.000Z",
  "title": "The cosmic evolution of radio-AGN feedback to z=1",
  "authors": [
    "P. N. Best",
    "L. M. Ker",
    "C. Simpson",
    "E. E. Rigby",
    "J. Sabater"
  ],
  "comment": "Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "This paper presents the first measurement of the radio luminosity function of 'jet-mode' (radiatively-inefficient) radio-AGN out to z=1, in order to investigate the cosmic evolution of radio-AGN feedback. Eight radio source samples are combined to produce a catalogue of 211 radio-loud AGN with 0.5<z<1.0, which are spectroscopically classified into jet-mode and radiative-mode (radiatively-efficient) AGN classes. Comparing with large samples of local radio-AGN from the Sloan Digital Sky Survey, the cosmic evolution of the radio luminosity function of each radio-AGN class is independently derived. Radiative-mode radio-AGN show an order of magnitude increase in space density out to z~1 at all luminosities, consistent with these AGN being fuelled by cold gas. In contrast, the space density of jet-mode radio-AGN decreases with increasing redshift at low radio luminosities (L_1.4 < 1e24 W/Hz) but increases at higher radio luminosities. Simple models are developed to explain the observed evolution. In the best-fitting models, the characteristic space density of jet-mode AGN declines with redshift in accordance with the declining space density of massive quiescent galaxies, which fuel them via cooling of gas in their hot haloes. A time delay of 1.5-2 Gyr may be present between the quenching of star formation and the onset of jet-mode radio-AGN activity. The behaviour at higher radio luminosities can be explained either by an increasing characteristic luminosity of jet-mode radio-AGN activity with redshift (roughly as (1+z) cubed) or if the jet-mode radio-AGN population also includes some contribution of cold-gas-fuelled sources seen at a time when their accretion rate was low. Higher redshifts measurements would distinguish between these possibilities.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-08-31T20:27:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmic evolution",
      "radio-agn feedback",
      "space density",
      "jet-mode radio-agn activity",
      "radio luminosity function"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu1776",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2014,
      "month": "Nov",
      "volume": 445,
      "number": 1,
      "pages": 955
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1313085,
      "adsabs": "2014MNRAS.445..955B"
    }
  }
}