arXiv 1102.21372011-02-10astro-ph.GA

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. Penarrubia, H. Hoekstra

备注：: 7 pages, 4 figures, accepted for publication by ApJL
DOI：: 10.1088/2041-8205/730/1/L6

英文摘要：

We present the results of deep imaging obtained at the CFHT 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.

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