A radial velocity survey of low Galactic latitude structures: II. The Monoceros Ring behind the Canis Major dwarf galaxy

Abstract

An AAT/2dF Spectrograph Survey of low Galactic latitudes targeting the putative Canis Major dwarf galaxy, and the (possibly) associated tidal debris of stars known as the Monoceros Ring, covering Galactic coordinates 231.5${}^{\circ }<${\it l} $<$ 247.5${}^{\circ }$ and -11.8${}^{\circ }<${\it b}$<-3.8^{\circ }$, has revealed the presence of the Monoceros Ring in the background of the Canis Major dwarf galaxy. This detection resides at a galactocentric distance of $\sim 18.9\pm$0.3\kpc (13.5$\pm$0.3\kpc heliocentric), exhibiting a velocity of $\sim 132.8\pm$1.3 $\kms$ with a dispersion of $\sim22.7\pm1.7\kms$; both of these comparable with previous measurements of the Monoceros Ring in nearby fields. This detection highlights the increasing complexity of structure being revealed in recent surveys of the Milky Way thick disk and Halo.

arXiv comment5 pages, accepted for publication MNRAS, 3 figures

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• The outer disc in shambles: blind detection of Monoceros and ACS with Gaia's astrometric sample
• The Dark Matter Density in the Solar Neighborhood reconsidered
• A Sagittarius-Induced Origin for the Monoceros Ring
• On the Origin of the Monoceros Ring - I: Kinematics, proper motions, and the nature of the progenitor