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Is the Milky Way still breathing? RAVE-Gaia streaming motions
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Number of Authors: 292018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 475, no 2, p. 2679-2696Article in journal (Refereed) Published
Abstract [en]

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-phi), and vertical (V-z) components of associated Galactocentric velocity. We search in particular for variation in all three velocity components with distance above and below the disc midplane, as well as how each component of V-z (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 V-z. Below the plane, we find the largest radial gradient to be partial derivative V-R/partial derivative R = -7.01 +/- 0.61 km s(-1) kpc(-1), in agreement with recent studies. Above the plane, we find a similar gradient with partial derivative V-R/partial derivative R = -9.42 +/- 1.77 km s(-1) kpc(-1). By comparing our results with previous studies, we find that the structure in V-z 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.

Place, publisher, year, edition, pages
2018. Vol. 475, no 2, p. 2679-2696
Keywords [en]
Galaxy: disc, Galaxy: kinematics and dynamics, Galaxy: structure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-154699DOI: 10.1093/mnras/stx3342ISI: 000427345900087OAI: oai:DiVA.org:su-154699DiVA, id: diva2:1198134
Available from: 2018-04-16 Created: 2018-04-16 Last updated: 2018-04-16Bibliographically approved

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Monari, Giacomo
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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