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Kinematics with GAI...
Kinematics with GAIA DR2 : The force of a dwarf
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- Carrillo, I. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Minchev, I. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Steinmetz, M. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Monari, G. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Laporte, C. F.P. (author)
- University of Victoria
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- Anders, F. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Queiroz, A. B.A. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Chiappini, C. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Khalatyan, A. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Martig, M. (author)
- Liverpool John Moores University
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- McMillan, P. J. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Santiago, B. X. (author)
- Federal University of Rio Grande do Sul,Laboratório Interinstitucional de E-Astronomia
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- Youakim, K. (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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(creator_code:org_t)
- 2019-08-26
- 2019
- English 16 s.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 1365-2966 .- 0035-8711. ; 490:1, s. 797-812
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Abstract
Subject headings
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- We use Gaia DR2 astrometric and line-of-sight velocity information combined with two sets of distances obtained with a Bayesian inference method to study the 3D velocity distribution in the Milky Way disc. We search for variations in all Galactocentric cylindrical velocity components (Vφ, VR, and Vz) with Galactic radius, azimuth, and distance from the disc mid-plane. We confirm recent work showing that bulk vertical motions in the R–z plane are consistent with a combination of breathing and bending modes. In the x–y plane, we show that, although the amplitudes change, the structure produced by these modes is mostly invariant as a function of distance from the plane. Comparing to two different Galactic disc models, we demonstrate that the observed patterns can drastically change in short time intervals, showing the complexity of understanding the origin of vertical perturbations. A strong radial VR gradient was identified in the inner disc, transitioning smoothly from 16 km s−1 kpc−1 at an azimuth of 30◦ < φ < 45◦ ahead of the Sun-Galactic centre line to −16 km s−1 kpc−1 at an azimuth of −45◦ < φ < −30◦ lagging the solar azimuth. We use a simulation with no significant recent mergers to show that exactly the opposite trend is expected from a barred potential, but overestimated distances can flip this trend to match the data. Alternatively, using an N-body simulation of the Sagittarius dwarf–Milky Way interaction, we demonstrate that a major recent perturbation is necessary to reproduce the observations. Such an impact may have strongly perturbed the existing bar or even triggered its formation in the last 1–2 Gyr.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxy: disc
- Galaxy: evolution
- Galaxy: kinematics and dynamics
- Galaxy: structure
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Carrillo, I.
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Minchev, I.
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Steinmetz, M.
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Monari, G.
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Laporte, C. F.P.
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Anders, F.
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Queiroz, A. B.A.
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Chiappini, C.
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Khalatyan, A.
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Martig, M.
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McMillan, P. J.
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Santiago, B. X.
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Youakim, K.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly Notices ...
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Lund University