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A Deep View of the Monoceros Ring in the Anticenter Direction: Clues of Its Extra-galactic Origin

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  • A. Sollima
  • D. Valls-Gabaud
  • D. Martinez-Delgado
  • J. Fliri
  • J. Peñarrubia
  • H. Hoekstra

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Original languageEnglish
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 1 Mar 2011


We present the results of deep imaging obtained at the Canada-France-Hawaii Telescope with MegaCam in the anticenter direction at two different heights above the Galactic disk. We detect the presence of the Monoceros ring in both fields as a conspicuous and narrow main-sequence feature which dominates star counts over a large portion of the color-magnitude diagram down to g' ~ 24. The comparison of the morphology and density of this feature with a large variety of Galactic models excludes the possibility that it can be due to a flare of the Galactic disk, supporting an extra-Galactic origin for this ring-like structure.

    Research areas

  • galaxies: interactions, Galaxy: disk, Galaxy: structure, methods: data analysis, techniques: photometric

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