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Detection of a radial velocity gradient in the extended local disc with RAVE

Siebert, A; Famaey, Benoit; Minchev, I; Seabroke, G. M; Binney, J; Burnett, B. C. M.; Freeman, Kenneth; Williams, Mary; Bienayme, O; Bland-Hawthorn, Joss; Campbell, R; Fulbright, J.P.; Steinmetz, Matthias; Wyse, Rosemary F G

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Using a sample of 213713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2kpc from the Sun and to |z| < 1kpc, 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...[Show more]

dc.contributor.authorSiebert, A
dc.contributor.authorFamaey, Benoit
dc.contributor.authorMinchev, I
dc.contributor.authorSeabroke, G. M
dc.contributor.authorBinney, J
dc.contributor.authorBurnett, B. C. M.
dc.contributor.authorFreeman, Kenneth
dc.contributor.authorWilliams, Mary
dc.contributor.authorBienayme, O
dc.contributor.authorBland-Hawthorn, Joss
dc.contributor.authorCampbell, R
dc.contributor.authorFulbright, J.P.
dc.contributor.authorSteinmetz, Matthias
dc.contributor.authorWyse, Rosemary F G
dc.date.accessioned2015-12-10T23:31:20Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/68580
dc.description.abstractUsing a sample of 213713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2kpc from the Sun and to |z| < 1kpc, 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| > rsim 3 km s-1 kpc-1, 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.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Stars: kinematics and dynamics
dc.titleDetection of a radial velocity gradient in the extended local disc with RAVE
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume412
dc.date.issued2011
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf2965xPUB1763
local.type.statusPublished Version
local.contributor.affiliationSiebert, A, Université de Strasbourg
local.contributor.affiliationFamaey, Benoit, Université de Strasbourg
local.contributor.affiliationMinchev, I, University of Strasbourg
local.contributor.affiliationSeabroke, G. M, University College London
local.contributor.affiliationBinney, J, University of Oxford
local.contributor.affiliationBurnett, B. C. M., Oxford University
local.contributor.affiliationFreeman, Kenneth, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWilliams, Mary, Astrophysikalisches Institut Potsdam
local.contributor.affiliationBienayme, O, Observatoire de Strasbourg
local.contributor.affiliationBland-Hawthorn, Joss, University of Sydney
local.contributor.affiliationCampbell, R, Astrophysical Institute Potsdam
local.contributor.affiliationFulbright, J.P., Johns Hopkins University
local.contributor.affiliationSteinmetz, Matthias, Astrophysical Institute Potsdam
local.contributor.affiliationWyse, Rosemary F G, Johns Hopkins University
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage2026
local.bibliographicCitation.lastpage2032
local.identifier.doi10.1111/j.1365-2966.2010.18037.x
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-02-24T08:16:51Z
local.identifier.scopusID2-s2.0-79953312254
local.identifier.thomsonID000289159100047
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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