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Article: The wobbly Galaxy: Kinematics north and south with RAVE red-clump giants

TitleThe wobbly Galaxy: Kinematics north and south with RAVE red-clump giants
Authors
KeywordsGalaxy: Kinematics and dynamics
Solar neighbourhood
Galaxy: Structure
Issue Date2013
Citation
Monthly Notices of the Royal Astronomical Society, 2013, v. 436, n. 1, p. 101-121 How to Cite?
AbstractTheRAdialVelocity Experiment survey, combined with proper motions and distance estimates, can be used to study in detail stellar kinematics in the extended solar neighbourhood (solar suburb). Using 72 365 red-clump stars, we examine the mean velocity components in 3D between 6 < R < 10 kpc and -2 < Z < 2 kpc, concentrating on north-south differences. Simple parametric fits to the (R, Z) trends for Vφ and the velocity dispersions are presented. We confirm the recently discovered gradient in mean Galactocentric radial velocity, VR, finding that the gradient is marked below the plane (δ(VR)/δR=-8 kms-1 kpc-1 for Z<0, vanishing to zero above the plane), with a Z gradient thus also present. The vertical velocity, VZ, also shows clear, large-amplitude (|VZ| = 17 km s-1) structure, with indications of a rarefaction- compression pattern, suggestive of wave-like behaviour. We perform a rigorous error analysis, tracing sources of both systematic and random errors. We confirm the north-south differences in VR and VZ along the line of sight, with the VR estimated independent of the proper motions. The complex three-dimensional structure of velocity space presents challenges for future modelling of the Galactic disc, with the Galactic bar, spiral arms and excitation of wave-like structures all probably playing a role. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Persistent Identifierhttp://hdl.handle.net/10722/208983
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorWilliams, Mary E K-
dc.contributor.authorSteinmetz, Matthias-
dc.contributor.authorBinney, James J.-
dc.contributor.authorSiebert, Arnaud-
dc.contributor.authorEnke, Harry-
dc.contributor.authorFamaey, Benoît-
dc.contributor.authorMinchev, Ivan-
dc.contributor.authorDe Jong, Roelof S.-
dc.contributor.authorBoeche, Corrado-
dc.contributor.authorFreeman, Kenneth C.-
dc.contributor.authorBienaymé, Olivier-
dc.contributor.authorBland-Hawthorn, Joss Bland-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGilmore, Gerard F.-
dc.contributor.authorGrebel, Eva K.-
dc.contributor.authorHelmi, Amina-
dc.contributor.authorKordopatis, Georges-
dc.contributor.authorMunari, Ulisse-
dc.contributor.authorNavarro, Julio F.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorReid, Warren A.-
dc.contributor.authorSeabroke, George M.-
dc.contributor.authorSharma, Sanjib-
dc.contributor.authorSiviero, Alessandro-
dc.contributor.authorWatson, Fred G.-
dc.contributor.authorWyse, Rosemary F G-
dc.contributor.authorZwitter, Tomaž-
dc.date.accessioned2015-03-23T02:02:27Z-
dc.date.available2015-03-23T02:02:27Z-
dc.date.issued2013-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2013, v. 436, n. 1, p. 101-121-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208983-
dc.description.abstractTheRAdialVelocity Experiment survey, combined with proper motions and distance estimates, can be used to study in detail stellar kinematics in the extended solar neighbourhood (solar suburb). Using 72 365 red-clump stars, we examine the mean velocity components in 3D between 6 < R < 10 kpc and -2 < Z < 2 kpc, concentrating on north-south differences. Simple parametric fits to the (R, Z) trends for Vφ and the velocity dispersions are presented. We confirm the recently discovered gradient in mean Galactocentric radial velocity, VR, finding that the gradient is marked below the plane (δ(VR)/δR=-8 kms-1 kpc-1 for Z<0, vanishing to zero above the plane), with a Z gradient thus also present. The vertical velocity, VZ, also shows clear, large-amplitude (|VZ| = 17 km s-1) structure, with indications of a rarefaction- compression pattern, suggestive of wave-like behaviour. We perform a rigorous error analysis, tracing sources of both systematic and random errors. We confirm the north-south differences in VR and VZ along the line of sight, with the VR estimated independent of the proper motions. The complex three-dimensional structure of velocity space presents challenges for future modelling of the Galactic disc, with the Galactic bar, spiral arms and excitation of wave-like structures all probably playing a role. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectGalaxy: Kinematics and dynamics-
dc.subjectSolar neighbourhood-
dc.subjectGalaxy: Structure-
dc.titleThe wobbly Galaxy: Kinematics north and south with RAVE red-clump giants-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1093/mnras/stt1522-
dc.identifier.scopuseid_2-s2.0-84887120549-
dc.identifier.volume436-
dc.identifier.issue1-
dc.identifier.spage101-
dc.identifier.epage121-
dc.identifier.eissn1365-2966-

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