eprintid: 10090603 rev_number: 16 eprint_status: archive userid: 608 dir: disk0/10/09/06/03 datestamp: 2020-01-28 12:41:04 lastmod: 2021-09-22 22:12:21 status_changed: 2020-01-28 12:41:04 type: article metadata_visibility: show creators_name: Williams, MEK creators_name: Steinmetz, M creators_name: Binney, J creators_name: Siebert, A creators_name: Enke, H creators_name: Famaey, B creators_name: Minchev, I creators_name: de Jong, RS creators_name: Boeche, C creators_name: Freeman, KC creators_name: Bienayme, O creators_name: Bland-Hawthorn, J creators_name: Gibson, BK creators_name: Gilmore, GF creators_name: Grebel, EK creators_name: Helmi, A creators_name: Kordopatis, G creators_name: Munari, U creators_name: Navarro, JF creators_name: Parker, QA creators_name: Reid, W creators_name: Seabroke, GM creators_name: Sharma, S creators_name: Siviero, A creators_name: Watson, FG creators_name: Wyse, RFG creators_name: Zwitter, T title: The wobbly Galaxy: kinematics north and south with RAVE red-clump giants ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 keywords: Galaxy: kinematics and dynamics, solar neighbourhood, Galaxy: structure note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: The RAdial Velocity 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 km s−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. date: 2013-11-21 date_type: published publisher: OXFORD UNIV PRESS official_url: https://doi.org/10.1093/mnras/stt1522 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 853588 doi: 10.1093/mnras/stt1522 lyricists_name: Seabroke, George lyricists_id: GMSEA14 actors_name: Jayawardana, Anusha actors_id: AJAYA51 actors_role: owner full_text_status: public publication: Monthly Notices of the Royal Astronomical Society volume: 436 number: 1 pagerange: 101-121 pages: 21 issn: 1365-2966 citation: Williams, MEK; Steinmetz, M; Binney, J; Siebert, A; Enke, H; Famaey, B; Minchev, I; ... Zwitter, T; + view all <#> Williams, MEK; Steinmetz, M; Binney, J; Siebert, A; Enke, H; Famaey, B; Minchev, I; de Jong, RS; Boeche, C; Freeman, KC; Bienayme, O; Bland-Hawthorn, J; Gibson, BK; Gilmore, GF; Grebel, EK; Helmi, A; Kordopatis, G; Munari, U; Navarro, JF; Parker, QA; Reid, W; Seabroke, GM; Sharma, S; Siviero, A; Watson, FG; Wyse, RFG; Zwitter, T; - view fewer <#> (2013) The wobbly Galaxy: kinematics north and south with RAVE red-clump giants. Monthly Notices of the Royal Astronomical Society , 436 (1) pp. 101-121. 10.1093/mnras/stt1522 <https://doi.org/10.1093/mnras%2Fstt1522>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10090603/1/Seabroke_stt1522.pdf