Is the Milky Way still breathing? RAVE–Gaia streaming motions. Issue 2 (5th January 2018)
- Record Type:
- Journal Article
- Title:
- Is the Milky Way still breathing? RAVE–Gaia streaming motions. Issue 2 (5th January 2018)
- Main Title:
- Is the Milky Way still breathing? RAVE–Gaia streaming motions
- Authors:
- Carrillo, I
Minchev, I
Kordopatis, G
Steinmetz, M
Binney, J
Anders, F
Bienaymé, O
Bland-Hawthorn, J
Famaey, B
Freeman, K C
Gilmore, G
Gibson, B K
Grebel, E K
Helmi, A
Just, A
Kunder, A
McMillan, P
Monari, G
Munari, U
Navarro, J
Parker, Q A
Reid, W
Seabroke, G
Sharma, S
Siebert, A
Watson, F
Wojno, J
Wyse, R F G
Zwitter, T - Abstract:
- Abstract: We use data from the Radial Velocity Experiment (RAVE) and the Tycho- Gaia astrometric solution (TGAS) catalogue to compute the velocity fields yielded by the radial ( V R ), azimuthal ( V ϕ ), and vertical ( Vz ) components of associated Galactocentric velocity. We search in particular for variation in all three velocity components with distance above and below the disc mid-plane, as well as how each component of Vz (line-of-sight and tangential velocity projections) modifies the obtained vertical structure. To study the dependence of velocity on proper motion and distance, we use two main samples: a RAVE sample including proper motions from the Tycho-2, PPMXL, and UCAC4 catalogues, and a RAVE–TGAS sample with inferred distances and proper motions from the TGAS and UCAC5 catalogues. In both samples, we identify asymmetries in V R and Vz . Below the plane, we find the largest radial gradient to be ∂ V R /∂ R = −7.01 ± 0.61 km s −1 kpc −1, in agreement with recent studies. Above the plane, we find a similar gradient with ∂ V R /∂ R = −9.42 ± 1.77 km s −1 kpc −1 . By comparing our results with previous studies, we find that the structure in Vz is strongly dependent on the adopted proper motions. Using the Galaxia Milky Way model, we demonstrate that distance uncertainties can create artificial wave-like patterns. In contrast to previous suggestions of a breathing mode seen in RAVE data, our results support a combination of bending and breathing modes, likelyAbstract: We use data from the Radial Velocity Experiment (RAVE) and the Tycho- Gaia astrometric solution (TGAS) catalogue to compute the velocity fields yielded by the radial ( V R ), azimuthal ( V ϕ ), and vertical ( Vz ) components of associated Galactocentric velocity. We search in particular for variation in all three velocity components with distance above and below the disc mid-plane, as well as how each component of Vz (line-of-sight and tangential velocity projections) modifies the obtained vertical structure. To study the dependence of velocity on proper motion and distance, we use two main samples: a RAVE sample including proper motions from the Tycho-2, PPMXL, and UCAC4 catalogues, and a RAVE–TGAS sample with inferred distances and proper motions from the TGAS and UCAC5 catalogues. In both samples, we identify asymmetries in V R and Vz . Below the plane, we find the largest radial gradient to be ∂ V R /∂ R = −7.01 ± 0.61 km s −1 kpc −1, in agreement with recent studies. Above the plane, we find a similar gradient with ∂ V R /∂ R = −9.42 ± 1.77 km s −1 kpc −1 . By comparing our results with previous studies, we find that the structure in Vz is strongly dependent on the adopted proper motions. Using the Galaxia Milky Way model, we demonstrate that distance uncertainties can create artificial wave-like patterns. In contrast to previous suggestions of a breathing mode seen in RAVE data, our results support a combination of bending and breathing modes, likely generated by a combination of external or internal and external mechanisms. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 475:Issue 2(2018)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 475:Issue 2(2018)
- Issue Display:
- Volume 475, Issue 2 (2018)
- Year:
- 2018
- Volume:
- 475
- Issue:
- 2
- Issue Sort Value:
- 2018-0475-0002-0000
- Page Start:
- 2679
- Page End:
- 2696
- Publication Date:
- 2018-01-05
- Subjects:
- Galaxy: disc -- Galaxy: kinematics and dynamics -- Galaxy: structure
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stx3342 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 12187.xml