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28 March 2024
 
  » arxiv » 1011.4092

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Detection of a radial velocity gradient in the extended local disc with RAVE
A. Siebert ; B. Famaey ; I. Minchev ; G.M. Seabroke ; J. Binney ; B. Burnett ; K.C. Freeman ; M. Williams ; O. Bienayme ; J. Bland-Hawthorn ; R. Campbell ; J.P. Fulbright ; B.K. Gibson ; G. Gilmore ; E.K. Grebel ; A. Helmi ; U. Munari ; J.F. Navarro ; Q.A. Parker ; W.A. Reid ; A. Siviero ; M. Steinmetz ; F. Watson ; R.F.G. Wyse ; T. Zwitter ;
Date 17 Nov 2010
AbstractUsing a sample of 213,713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z|<1 kpc, we report the detection of a velocity gradient of disc stars in the fourth quadrant, directed radially from the Galactic centre. In the direction of the Galactic centre, we apply a simple method independent of stellar proper motions and of Galactic parameters to assess the existence of this gradient in the RAVE data. This velocity gradient corresponds to |K+C| < 3 km/s/kpc, where K and C are the Oort constants measuring the local divergence and radial shear of the velocity field, respectively. In order to illustrate the effect, assuming a zero radial velocity of the Local Standard of Rest we then reconstruct the two-dimensional Galactocentric velocity maps using two different sets of proper motions and photometric distances based either on isochrone fitting or on K-band magnitudes, and considering two sets of values for the Galactocentric radius of the Sun and local circular speed. Further observational confirmation of our finding with line-of-sight velocities of stars at low latitudes, together with further modelling, should help constrain the non-axisymmetric components of the Galactic potential, including the bar, the spiral arms and possibly the ellipticity of the dark halo.
Source arXiv, 1011.4092
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