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Article: Estimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models

TitleEstimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models
Authors
KeywordsStars: kinematics
Galaxy: fundamental parameters
Galaxy: kinematics and dynamics
Issue Date2008
Citation
Monthly Notices of the Royal Astronomical Society, 2008, v. 391, n. 2, p. 793-801 How to Cite?
AbstractABSTRACT 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. © 2008 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/208887
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorSiebert, Arnaud-
dc.contributor.authorBienaymé, Olivier-
dc.contributor.authorBinney, James J.-
dc.contributor.authorBland-Hawthorn, Joss Bland-
dc.contributor.authorCampbell, Randy D.-
dc.contributor.authorFreeman, Kenneth C.-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGilmore, Gerard F.-
dc.contributor.authorGrebel, Eva K.-
dc.contributor.authorHelmi, Amina-
dc.contributor.authorMunari, Ulisse-
dc.contributor.authorNavarro, Julio F.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorSeabroke, George M.-
dc.contributor.authorSiviero, Alessandro-
dc.contributor.authorSteinmetz, Matthias-
dc.contributor.authorWilliams, Mary E K-
dc.contributor.authorWyse, Rosemary F G-
dc.contributor.authorZwitter, Tomaž-
dc.date.accessioned2015-03-23T02:02:04Z-
dc.date.available2015-03-23T02:02:04Z-
dc.date.issued2008-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2008, v. 391, n. 2, p. 793-801-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208887-
dc.description.abstractABSTRACT 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. © 2008 RAS.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectStars: kinematics-
dc.subjectGalaxy: fundamental parameters-
dc.subjectGalaxy: kinematics and dynamics-
dc.titleEstimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2008.13912.x-
dc.identifier.scopuseid_2-s2.0-57149141424-
dc.identifier.volume391-
dc.identifier.issue2-
dc.identifier.spage793-
dc.identifier.epage801-
dc.identifier.eissn1365-2966-

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