Detection of a radial velocity gradient in the extended local disc with RAVE
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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
Description
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.author | Siebert, A | |
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dc.contributor.author | Famaey, Benoit | |
dc.contributor.author | Minchev, I | |
dc.contributor.author | Seabroke, G. M | |
dc.contributor.author | Binney, J | |
dc.contributor.author | Burnett, B. C. M. | |
dc.contributor.author | Freeman, Kenneth | |
dc.contributor.author | Williams, Mary | |
dc.contributor.author | Bienayme, O | |
dc.contributor.author | Bland-Hawthorn, Joss | |
dc.contributor.author | Campbell, R | |
dc.contributor.author | Fulbright, J.P. | |
dc.contributor.author | Steinmetz, Matthias | |
dc.contributor.author | Wyse, Rosemary F G | |
dc.date.accessioned | 2015-12-10T23:31:20Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/68580 | |
dc.description.abstract | 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 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.publisher | Blackwell Publishing Ltd | |
dc.rights | Author/s retain copyright | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Keywords: Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Stars: kinematics and dynamics | |
dc.title | Detection of a radial velocity gradient in the extended local disc with RAVE | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 412 | |
dc.date.issued | 2011 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | f2965xPUB1763 | |
local.type.status | Published Version | |
local.contributor.affiliation | Siebert, A, Université de Strasbourg | |
local.contributor.affiliation | Famaey, Benoit, Université de Strasbourg | |
local.contributor.affiliation | Minchev, I, University of Strasbourg | |
local.contributor.affiliation | Seabroke, G. M, University College London | |
local.contributor.affiliation | Binney, J, University of Oxford | |
local.contributor.affiliation | Burnett, B. C. M., Oxford University | |
local.contributor.affiliation | Freeman, Kenneth, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Williams, Mary, Astrophysikalisches Institut Potsdam | |
local.contributor.affiliation | Bienayme, O, Observatoire de Strasbourg | |
local.contributor.affiliation | Bland-Hawthorn, Joss, University of Sydney | |
local.contributor.affiliation | Campbell, R, Astrophysical Institute Potsdam | |
local.contributor.affiliation | Fulbright, J.P., Johns Hopkins University | |
local.contributor.affiliation | Steinmetz, Matthias, Astrophysical Institute Potsdam | |
local.contributor.affiliation | Wyse, Rosemary F G, Johns Hopkins University | |
local.bibliographicCitation.issue | 3 | |
local.bibliographicCitation.startpage | 2026 | |
local.bibliographicCitation.lastpage | 2032 | |
local.identifier.doi | 10.1111/j.1365-2966.2010.18037.x | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2016-02-24T08:16:51Z | |
local.identifier.scopusID | 2-s2.0-79953312254 | |
local.identifier.thomsonID | 000289159100047 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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