The Monoceros Ring, and Other Substructure Near the Galactic Plane
The outer Milky Way stellar structure known as “The Monoceros Ring” was discovered in imaging data in 2002. Since then, numerous photometric and spectroscopic explorations of this structure, some 18 kpc from the Galactic center and at low Galactic latitudes, have led to a rich discussion in the field on its composition, possible origins, and relevance for theories of galaxy formation and studies of dark matter. This substructure was initially thought to be either a tidal stream from a disrupted dwarf galaxy or the result of a warping and flaring of the Milky Way disk. A newer conjecture is that the structure is due to disk oscillations, possibly caused by a massive Milky Way satellite passing through the disk.
KeywordsDark Matter Galactic Center Galactic Plane Dwarf Galaxy Galactic Disk
Brian Yanny acknowledges support from the DOE Office of Science. Heidi Jo Newberg was partially supported by grants NSF AST 14-09421 and NSF AST 09-37523, by the MilkyWay@home volunteers and supporters, and in particular by Manit Limlamai, Babette Josephs, Lee Newberg, the Marvin Clan, and the 2015 Breakthrough Prize in Fundamental Physics.
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