Monoceros Ring is a proposed ring of stars around the Milky Way which consists of stars torn from the Canis Major Dwarf Galaxy as it merges with the Milky Way over the course of billions of years. It is a complex ringlike structure which wraps around our galaxy three times, formed from the long filament of stars pulled from the Canis Major Dwarf Galaxy by tidal forces as it orbits the Milky Way.
The stream of stars was first reported in 2002 by astronomers conducting the Sloan Digital Sky Survey. It was in the course of investigating this ring of stars, and a closely spaced group of globular clusters similar to those associated with the Sagittarius Dwarf Elliptical Galaxy, that the Canis Major Dwarf Galaxy was discovered.
In 2006, a study using 2MASS data cast doubts on the nature of the "Ring", aruing that the data is suggestive of the fact that the ring is actually part of the warped galactic disc of the Milky Way. However, observations using the Anglo-Australian Telescope published in 2007 suggest that a warped disc cannot create the observed structure, which must therefore be formed either by a flare of the Galactic disc or have an extra-Galactic origin.
- The Ghost of Sagittarius and Lumps in the Halo of the Milky Way Newberg H. J., et al., 2002, ApJ, 569, 245
- Deriving The Shape Of The Galactic Stellar Disc (SkyNightly) March 17, 2006
- Deriving the shape of the Galactic stellar disc, A&A press release, March 16, 2006
- Outer structure of the Galactic warp and flare: explaining the Canis Major over-density, Astronomy & Astrophysics, 2006
- The AAT/WFI survey of the Monoceros Ring and Canis Major Dwarf galaxy: I. from l = (193 - 276)°, Conn, Blair C., et al., 2007, MNRAS, in press
- Solstation.com: Outer Disk Ring?, review of a letter to New Scientist from Naomi McClure-Griffiths et al. (Both latest retrieved 9 Jun 2007)
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