Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-17
Mon.Not.Roy.Astron.Soc.Lett.364:L13-L17,2005
Astronomy and Astrophysics
Astrophysics
5 pages, accepted for publication MNRAS, 3 figures
Scientific paper
10.1111/j.1745-3933.2005.00095.x
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 $\sim18.9\pm$0.3\kpc (13.5$\pm$0.3\kpc heliocentric), exhibiting a velocity of $\sim132.8\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.
Bellazzini Michele
Conn Blair C.
Ibata Rodrigo A.
Irwin Mike J.
Lewis Geraint F.
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