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

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 dominat...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2011-03, Vol.730 (1), p.L6
Main Authors: Sollima, A, Valls-Gabaud, D, Martinez-Delgado, D, Fliri, J, Peñarrubia, J, Hoekstra, H
Format: Article
Language:English
Subjects:
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DENSITY
GALAXIES
MORPHOLOGY
PHYSICAL PROPERTIES
Physics
RINGS
STARS
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Summary: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.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/730/1/L6