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Article: The wobbly Galaxy: Kinematics north and south with RAVE red-clump giants
Title | The wobbly Galaxy: Kinematics north and south with RAVE red-clump giants |
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Authors | Williams, Mary E KSteinmetz, MatthiasBinney, James J.Siebert, ArnaudEnke, HarryFamaey, BenoîtMinchev, IvanDe Jong, Roelof S.Boeche, CorradoFreeman, Kenneth C.Bienaymé, OlivierBland-Hawthorn, Joss BlandGibson, Brad K.Gilmore, Gerard F.Grebel, Eva K.Helmi, AminaKordopatis, GeorgesMunari, UlisseNavarro, Julio F.Parker, Quentin A.Reid, Warren A.Seabroke, George M.Sharma, SanjibSiviero, AlessandroWatson, Fred G.Wyse, Rosemary F GZwitter, Tomaž |
Keywords | Galaxy: Kinematics and dynamics Solar neighbourhood Galaxy: Structure |
Issue Date | 2013 |
Publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ |
Citation | Monthly Notices of the Royal Astronomical Society, 2013, v. 436, n. 1, p. 101-121 How to Cite? |
Abstract | TheRAdialVelocity 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 Identifier | http://hdl.handle.net/10722/208983 |
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 | Williams, Mary E K | - |
dc.contributor.author | Steinmetz, Matthias | - |
dc.contributor.author | Binney, James J. | - |
dc.contributor.author | Siebert, Arnaud | - |
dc.contributor.author | Enke, Harry | - |
dc.contributor.author | Famaey, Benoît | - |
dc.contributor.author | Minchev, Ivan | - |
dc.contributor.author | De Jong, Roelof S. | - |
dc.contributor.author | Boeche, Corrado | - |
dc.contributor.author | Freeman, Kenneth C. | - |
dc.contributor.author | Bienaymé, Olivier | - |
dc.contributor.author | Bland-Hawthorn, Joss Bland | - |
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 | Kordopatis, Georges | - |
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 | Seabroke, George M. | - |
dc.contributor.author | Sharma, Sanjib | - |
dc.contributor.author | Siviero, Alessandro | - |
dc.contributor.author | Watson, Fred G. | - |
dc.contributor.author | Wyse, Rosemary F G | - |
dc.contributor.author | Zwitter, Tomaž | - |
dc.date.accessioned | 2015-03-23T02:02:27Z | - |
dc.date.available | 2015-03-23T02:02:27Z | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2013, v. 436, n. 1, p. 101-121 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/208983 | - |
dc.description.abstract | TheRAdialVelocity 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.language | eng | - |
dc.publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.subject | Galaxy: Kinematics and dynamics | - |
dc.subject | Solar neighbourhood | - |
dc.subject | Galaxy: Structure | - |
dc.title | The wobbly Galaxy: Kinematics north and south with RAVE red-clump giants | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1093/mnras/stt1522 | - |
dc.identifier.scopus | eid_2-s2.0-84887120549 | - |
dc.identifier.volume | 436 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 101 | - |
dc.identifier.epage | 121 | - |
dc.identifier.eissn | 1365-2966 | - |
dc.identifier.isi | WOS:000326435100031 | - |
dc.identifier.issnl | 0035-8711 | - |