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Article: Detection of a radial velocity gradient in the extended local disc with RAVE
Title | Detection of a radial velocity gradient in the extended local disc with RAVE |
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Authors | Siebert, ArnaudFamaey, BenoîtMinchev, IvanSeabroke, George M.Binney, James J.Burnett, Benedict C MFreeman, Kenneth C.Williams, Mary E KBienaymé, OlivierBland-Hawthorn, Joss BlandCampbell, Randy D.Fulbright, Jon P.Gibson, Brad K.Gilmore, Gerard F.Grebel, Eva K.Helmi, AminaMunari, UlisseNavarro, Julio F.Parker, Quentin A.Reid, Warren A.Siviero, AlessandroSteinmetz, MatthiasWatson, Fred G.Wyse, Rosemary F GZwitter, Tomaž |
Keywords | Galaxy: kinematics and dynamics Stars: kinematics and dynamics Galaxy: fundamental parameters |
Issue Date | 2011 |
Citation | Monthly Notices of the Royal Astronomical Society, 2011, v. 412, n. 3, p. 2026-2032 How to Cite? |
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. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS. |
Persistent Identifier | http://hdl.handle.net/10722/209000 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Siebert, Arnaud | - |
dc.contributor.author | Famaey, Benoît | - |
dc.contributor.author | Minchev, Ivan | - |
dc.contributor.author | Seabroke, George M. | - |
dc.contributor.author | Binney, James J. | - |
dc.contributor.author | Burnett, Benedict C M | - |
dc.contributor.author | Freeman, Kenneth C. | - |
dc.contributor.author | Williams, Mary E K | - |
dc.contributor.author | Bienaymé, Olivier | - |
dc.contributor.author | Bland-Hawthorn, Joss Bland | - |
dc.contributor.author | Campbell, Randy D. | - |
dc.contributor.author | Fulbright, Jon P. | - |
dc.contributor.author | Gibson, Brad K. | - |
dc.contributor.author | Gilmore, Gerard F. | - |
dc.contributor.author | Grebel, Eva K. | - |
dc.contributor.author | Helmi, Amina | - |
dc.contributor.author | Munari, Ulisse | - |
dc.contributor.author | Navarro, Julio F. | - |
dc.contributor.author | Parker, Quentin A. | - |
dc.contributor.author | Reid, Warren A. | - |
dc.contributor.author | Siviero, Alessandro | - |
dc.contributor.author | Steinmetz, Matthias | - |
dc.contributor.author | Watson, Fred G. | - |
dc.contributor.author | Wyse, Rosemary F G | - |
dc.contributor.author | Zwitter, Tomaž | - |
dc.date.accessioned | 2015-03-23T02:02:30Z | - |
dc.date.available | 2015-03-23T02:02:30Z | - |
dc.date.issued | 2011 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2011, v. 412, n. 3, p. 2026-2032 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/209000 | - |
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. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS. | - |
dc.language | eng | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.subject | Galaxy: kinematics and dynamics | - |
dc.subject | Stars: kinematics and dynamics | - |
dc.subject | Galaxy: fundamental parameters | - |
dc.title | Detection of a radial velocity gradient in the extended local disc with RAVE | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2966.2010.18037.x | - |
dc.identifier.scopus | eid_2-s2.0-79953312254 | - |
dc.identifier.volume | 412 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 2026 | - |
dc.identifier.epage | 2032 | - |
dc.identifier.eissn | 1365-2966 | - |
dc.identifier.isi | WOS:000289159100047 | - |
dc.identifier.issnl | 0035-8711 | - |