{
  "id": "1010.0691",
  "version": "v2",
  "published": "2010-10-04T20:13:54.000Z",
  "updated": "2010-11-11T15:39:03.000Z",
  "title": "Evidence for a maximum jet efficiency for the most powerful radio galaxies",
  "authors": [
    "Cristina A. C. Fernandes",
    "Matt J. Jarvis",
    "Steve Rawlings",
    "Alejo Martinez-Sansigre",
    "Evanthia Hatziminaoglou",
    "Mark Lacy",
    "Mat J. Page",
    "Jason A. Stevens",
    "Eleni Vardoulaki"
  ],
  "comment": "9 pages, 4 figures. Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO",
    "astro-ph.GA"
  ],
  "abstract": "We use new mid-infrared (mid-IR) photometry from the Spitzer Space Telescope to study the relations between low-frequency radio luminosity density L_151MHz, mid-IR (12um rest-frame) luminosity L_12um, and optical-emission-line ([OII]) luminosity L_[OII], for a complete sample of z~1 radio galaxies from the 3CRR, 6CE, 6C*, 7CRS and TOOT00 surveys. The narrow redshift span of our sample (0.9<z<1.1) means that it is unbiased to evolutionary effects. We find evidence that these three quantities are positively correlated. The scaling between L_12um and L_[OII] is similar to that seen in other AGN samples, consistent with both L_12um and L_[OII] tracing accretion rate. We show that the positive correlation between L_12um and L_151MHz implies that there is a genuine lack of objects with low values of L_12um at high values of L_151MHz. Given that L_12um traces accretion rate, while L_151MHz traces jet power, this can be understood in terms of a minimum accretion rate being necessary to produce a given jet power. This implies that there is a maximum efficiency with which accreted energy can be chanelled into jet power and that this efficiency is of order unity.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-11-11T15:39:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "maximum jet efficiency",
      "powerful radio galaxies",
      "low-frequency radio luminosity density",
      "narrow redshift span",
      "minimum accretion rate"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2010.17820.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2011,
      "month": "Mar",
      "volume": 411,
      "number": 3,
      "pages": 1909
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 872066,
      "adsabs": "2011MNRAS.411.1909F"
    }
  }
}