{
  "id": "1511.02993",
  "version": "v1",
  "published": "2015-11-10T05:09:40.000Z",
  "updated": "2015-11-10T05:09:40.000Z",
  "title": "The VMC Survey. XVIII. Radial dependence of the low-mass, 0.55--0.82 $M_\\odot$ stellar mass function in the Galactic globular cluster 47 Tucanae",
  "authors": [
    "Chaoli Zhang",
    "Chengyuan Li",
    "Richard de Grijs",
    "Kenji Bekki",
    "Licai Deng",
    "Simone Zaggia",
    "Stefano Rubele",
    "Andrés E. Piatti",
    "Maria-Rosa L. Cioni",
    "Jim Emerson",
    "Bi-Qing For",
    "Vincenzo Ripepi",
    "Marcella Marconi",
    "Valentin D. Ivanov",
    "Li Chen"
  ],
  "comment": "10 pages, 9 figures, accepted to publication in ApJ",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We use near-infrared observations obtained as part of the {\\sl Visible and Infrared Survey Telescope for Astronomy} (VISTA) Survey of the Magellanic Clouds (VMC), as well as two complementary {\\sl Hubble Space Telescope} ({\\sl HST}) data sets, to study the luminosity and mass functions as a function of clustercentric radius of the main-sequence stars in the Galactic globular cluster 47 Tucanae. The {\\sl HST} observations indicate a relative deficit in the numbers of faint stars in the central region of the cluster compared with its periphery, for $18.75\\leq m_{\\rm F606W}\\leq 20.9$ mag (corresponding to a stellar mass range of $0.55<m_\\ast/{M_\\odot}<0.73$). The stellar number counts at $6.7'$ from the cluster core show a deficit for $17.62\\leq m_{\\rm F606W}\\leq 19.7$ mag (i.e., $0.65<m_\\ast/{M_\\odot}<0.82$), which is consistent with expectations from mass segregation. The VMC-based stellar mass functions exhibit power-law shapes for masses in the range $0.55<m_\\ast/{M_\\odot}< 0.82$. These power laws are characterized by an almost constant slope, $\\alpha$. The radial distribution of the power-law slopes $\\alpha$ thus shows evidence of the importance of both mass segregation and tidal stripping, for both the first- and second-generation stars in 47 Tuc.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-10T05:09:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stellar mass function",
      "galactic globular cluster",
      "radial dependence",
      "vmc survey",
      "mass segregation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}