{
  "id": "1204.5363",
  "version": "v1",
  "published": "2012-04-24T13:11:10.000Z",
  "updated": "2012-04-24T13:11:10.000Z",
  "title": "Is there a Size Difference between Red and Blue Globular Clusters?",
  "authors": [
    "J. M. B. Downing"
  ],
  "comment": "10 pages, 14 figures, 1 table. Submitted to MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "Blue (metal-poor) globular clusters are observed to have half-light radii that are ~20% larger than their red (metal-rich) counterparts. The origin of this enhancement is not clear and differences in either the luminosity function or in the actual size of the clusters have been proposed. I analyze a set of dynamically self-consistent Monte Carlo globular cluster simulations to determine the origin of this enhancement. I find that my simulated blue clusters have larger half-light radii due to differences in the luminosity functions of metal-poor and metal-rich stars. I find that the blue clusters can also be physically larger, but only if they have a substantial number of black holes heating their central regions. In this case the difference between half-light radii is significantly larger than observed. I conclude that the observed difference in half-light radii between red and blue globular clusters is due to differences in their luminosity functions and that half-light radius is not a reliable proxy for cluster size.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-04-24T13:11:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "blue globular clusters",
      "half-light radius",
      "size difference",
      "luminosity function",
      "self-consistent monte carlo globular cluster"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2012.21680.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2012,
      "month": "Sep",
      "volume": 425,
      "number": 3,
      "pages": 2234
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1112146,
      "adsabs": "2012MNRAS.425.2234D"
    }
  }
}