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2005MNRAS.362..906M - Mon. Not. R. Astron. Soc., 362, 906-914 (2005/September-3)
A radial velocity survey of low Galactic latitude structures - I. Kinematics of the Canis Major dwarf galaxy.
MARTIN N.F., IBATA R.A., CONN B.C., LEWIS G.F., BELLAZZINI M. and IRWIN M.J.
Abstract (from CDS):
The radial velocity distribution is used to select Canis Major stars in the UCAC2.0 proper motion catalogue and derive proper motions in Galactic coordinates of (µl, µb) = (-3.6±0.8mas/yr, 1.5±0.4mas/yr) for the dwarf galaxy, which after correcting for the reflex solar motion along this line of sight gives (µ'l, µ'_b_) = (-6.8±0.8mas/yr, 0.8±0.4mas/yr), corresponding to a prograde orbit with a tangential velocity of ∼235km/s at the average distance of ∼7.2kpc. All these kinematic constraints can be reproduced in simulations of the accretion of a dwarf on to the Galactic disc. Such a process could also be responsible for the Monoceros Ring that has recently been shown to encompass the Galactic disc. However, without constraints on the kinematics of the tidal arms emerging from the Canis Major dwarf, it is not yet possible to definitively prove a link between the two structures.
Abstract Copyright: 2004 RAS
Journal keyword(s): Galaxy: structure - galaxies: individual: Canis Major - galaxies: interactions
Simbad objects: 14
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