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Article: The properties of the local spiral arms from RAVE data: Two-dimensional density wave approach

TitleThe properties of the local spiral arms from RAVE data: Two-dimensional density wave approach
Authors
KeywordsStars: kinematics and dynamics
Galaxy: fundamental parameters
Galaxy: kinematics and dynamics
Issue Date2012
Citation
Monthly Notices of the Royal Astronomical Society, 2012, v. 425, n. 3, p. 2335-2342 How to Cite?
AbstractUsing the Radial Velocity Experiment (RAVE) survey, we recently brought to light a gradient in the mean galactocentric radial velocity of stars in the extended solar neighbourhood. This gradient likely originates from non-axisymmetric perturbations of the potential, among which a perturbation by spiral arms is a possible explanation. Here, we apply the traditional density wave theory and analytically model the radial component of the two-dimensional velocity field. Provided that the radial velocity gradient is caused by relatively long-lived spiral arms that can affect stars substantially above the plane, this analytic model provides new independent estimates for the parameters of the Milky Way spiral structure. Our analysis favours a two-armed perturbation with the Sun close to the inner ultra-harmonic 4:1 resonance, with a pattern speed Ωp=18.6-0.2+0.3kms-1kpc-1 and a small amplitude A=0.55-0.02+0.02 per cent of the background potential (14 per cent of the background density). This model can serve as a basis for numerical simulations in three dimensions, additionally including a possible influence of the Galactic bar and/or other non-axisymmetric modes. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/208943
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorSiebert, Arnaud-
dc.contributor.authorFamaey, Benoît-
dc.contributor.authorBinney, James J.-
dc.contributor.authorBurnett, Benedict C M-
dc.contributor.authorFauré, Carole-
dc.contributor.authorMinchev, Ivan-
dc.contributor.authorWilliams, Mary E K-
dc.contributor.authorBienaymé, Olivier-
dc.contributor.authorBland-Hawthorn, Joss Bland-
dc.contributor.authorBoeche, Corrado-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGrebel, Eva K.-
dc.contributor.authorHelmi, Amina-
dc.contributor.authorJust, Andreas-
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.authorSiviero, Alessandro-
dc.contributor.authorSteinmetz, Matthias-
dc.contributor.authorZwitter, Tomaž-
dc.date.accessioned2015-03-23T02:02:18Z-
dc.date.available2015-03-23T02:02:18Z-
dc.date.issued2012-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2012, v. 425, n. 3, p. 2335-2342-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208943-
dc.description.abstractUsing the Radial Velocity Experiment (RAVE) survey, we recently brought to light a gradient in the mean galactocentric radial velocity of stars in the extended solar neighbourhood. This gradient likely originates from non-axisymmetric perturbations of the potential, among which a perturbation by spiral arms is a possible explanation. Here, we apply the traditional density wave theory and analytically model the radial component of the two-dimensional velocity field. Provided that the radial velocity gradient is caused by relatively long-lived spiral arms that can affect stars substantially above the plane, this analytic model provides new independent estimates for the parameters of the Milky Way spiral structure. Our analysis favours a two-armed perturbation with the Sun close to the inner ultra-harmonic 4:1 resonance, with a pattern speed Ωp=18.6-0.2+0.3kms-1kpc-1 and a small amplitude A=0.55-0.02+0.02 per cent of the background potential (14 per cent of the background density). This model can serve as a basis for numerical simulations in three dimensions, additionally including a possible influence of the Galactic bar and/or other non-axisymmetric modes. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectStars: kinematics and dynamics-
dc.subjectGalaxy: fundamental parameters-
dc.subjectGalaxy: kinematics and dynamics-
dc.titleThe properties of the local spiral arms from RAVE data: Two-dimensional density wave approach-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2012.21638.x-
dc.identifier.scopuseid_2-s2.0-84865585262-
dc.identifier.volume425-
dc.identifier.issue3-
dc.identifier.spage2335-
dc.identifier.epage2342-
dc.identifier.eissn1365-2966-

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