{
  "id": "2005.08982",
  "version": "v1",
  "published": "2020-05-18T18:00:03.000Z",
  "updated": "2020-05-18T18:00:03.000Z",
  "title": "Millisecond Pulsars Modify the Radio-SFR Correlation in Quiescent Galaxies",
  "authors": [
    "Takahiro Sudoh",
    "Tim Linden",
    "John F. Beacom"
  ],
  "comment": "Main text 11 pages, 2 figures. Comments welcome",
  "categories": [
    "astro-ph.GA",
    "astro-ph.HE",
    "hep-ph"
  ],
  "abstract": "The observed correlation between the far-infrared (FIR) and radio luminosities of star-forming galaxies shows the close connection between star formation and cosmic-ray production. LOFAR recently extended radio observations of the related correlation with star formation rate to lower frequencies (150~MHz), finding a peculiar radio excess in galaxies with high stellar masses and low star-formation rates. We show that recycled/millisecond pulsars (MSPs) can dominate the non-thermal emission in these massive quiescent galaxies and explain the excess. This is supported by recent data suggesting that MSPs can efficiently convert a large fraction of their spin-down power to e$^+$e$^-$ pairs. We find that MSP-based models provide a significantly improved (formally $>19\\sigma$, though systematic errors dominate) fit to LOFAR data. We discuss implications for the radio-FIR correlation, the observation of radio excesses in nearby galaxies, and local electron and positron observations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-05-18T18:00:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quiescent galaxies",
      "millisecond pulsars modify",
      "radio-sfr correlation",
      "star formation rate",
      "peculiar radio excess"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}