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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 | Abstract: | Using 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 | Services: | Forum | Review | PDF | Favorites |
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