Estimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models
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Siebert, A; Bienayme, O; Binney, J; Bland-Hawthorn, Joss; Campbell, R; Freeman, Kenneth; Gibson, Bradley K; Gilmore, Gerard; Grebel, E.; Helmi, Amina; Munari, U; Williams, Mary
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ABSTRACT We present a measure of the inclination of the velocity ellipsoid at 1 kpc below the Galactic plane using a sample of red clump giants from the RAdial Velocity Experiment (RAVE) Data Release 2. We find that the velocity ellipsoid is tilted towards the Galactic plane with an inclination of. We compare this value to computed inclinations for two mass models of the Milky Way. We find that our measurement is consistent with a short scalelength of the stellar disc (Rd ≃ 2 kpc) if the dark...[Show more]
dc.contributor.author | Siebert, A | |
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dc.contributor.author | Bienayme, O | |
dc.contributor.author | Binney, J | |
dc.contributor.author | Bland-Hawthorn, Joss | |
dc.contributor.author | Campbell, R | |
dc.contributor.author | Freeman, Kenneth | |
dc.contributor.author | Gibson, Bradley K | |
dc.contributor.author | Gilmore, Gerard | |
dc.contributor.author | Grebel, E. | |
dc.contributor.author | Helmi, Amina | |
dc.contributor.author | Munari, U | |
dc.contributor.author | Williams, Mary | |
dc.date.accessioned | 2015-12-08T22:39:17Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/36185 | |
dc.description.abstract | ABSTRACT We present a measure of the inclination of the velocity ellipsoid at 1 kpc below the Galactic plane using a sample of red clump giants from the RAdial Velocity Experiment (RAVE) Data Release 2. We find that the velocity ellipsoid is tilted towards the Galactic plane with an inclination of. We compare this value to computed inclinations for two mass models of the Milky Way. We find that our measurement is consistent with a short scalelength of the stellar disc (Rd ≃ 2 kpc) if the dark halo is oblate or with a long scalelength (Rd ≃ 3 kpc) if the dark halo is prolate. Once combined with independent constraints on the flattening of the halo, our measurement suggests that the scalelength is approximately halfway between these two extreme values, with a preferred range 2.5-2.7 kpc for a nearly spherical halo. Nevertheless, no model can be clearly ruled out. With the continuation of the RAVE survey, it will be possible to provide a strong constraint on the mass distribution of the Milky Way using refined measurements of the orientation of the velocity ellipsoid. | |
dc.publisher | Blackwell Publishing Ltd | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Keywords: Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Stars: kinematics | |
dc.title | Estimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 391 | |
dc.date.issued | 2008 | |
local.identifier.absfor | 020104 - Galactic Astronomy | |
local.identifier.ariespublication | u4362859xPUB133 | |
local.type.status | Published Version | |
local.contributor.affiliation | Siebert, A, Astrophysical Institute Potsdam | |
local.contributor.affiliation | Bienayme, O, Observatoire de Strasbourg | |
local.contributor.affiliation | Binney, J, University of Oxford | |
local.contributor.affiliation | Bland-Hawthorn, Joss, Anglo-Australian Observatory | |
local.contributor.affiliation | Campbell, R, Astrophysical Institute Potsdam | |
local.contributor.affiliation | Freeman, Kenneth, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Gibson, Bradley K, University of Central Lancashire | |
local.contributor.affiliation | Gilmore, Gerard, University of Cambridge | |
local.contributor.affiliation | Grebel, E., Universitat Heidelberg | |
local.contributor.affiliation | Helmi, Amina, University of Groningen | |
local.contributor.affiliation | Munari, U, INAF-Osservatorio Astronomico di Padova | |
local.contributor.affiliation | Williams, Mary, College of Physical and Mathematical Sciences, ANU | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 2 | |
local.bibliographicCitation.startpage | 793 | |
local.bibliographicCitation.lastpage | 801 | |
local.identifier.doi | 10.1111/j.1365-2966.2008.13912.x | |
dc.date.updated | 2016-02-24T11:06:02Z | |
local.identifier.scopusID | 2-s2.0-57149141424 | |
local.identifier.thomsonID | 000261265300026 | |
Collections | ANU Research Publications |
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