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