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

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

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
JournalAstrophysical Journal Letters
Volume730
Issue number1
DOIs
Publication statusPublished - 1 Mar 2011

Keywords

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

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