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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Moving Groups as the Origin of the Vertical Phase-space Spiral in the Galactic Neighborhood

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Michtchenko, Tatiana A. [1] ; Barros, Douglas A. [2] ; Perez-Villegas, Angeles [1] ; Lepine, Jacques R. D. [1]
Total Authors: 4
[1] Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Univ, BR-05508090 Sao Paulo - Brazil
[2] Rua Sessenta & Tres 125, BR-53090393 Olinda, PE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 876, n. 1 MAY 1 2019.
Web of Science Citations: 1

Using Gaia data release 2 (DR2), we analyzed the distribution of stars in the close vicinity of the Sun in the full 3D position-velocity space. We have found no evidence of incomplete phase mixing in the vertical direction of the disk, which could have originated from external events. We show that the vertical phase-space spiral Z-V-z is produced by the well-known moving groups (MGs), mainly by Coma Berenices, Pleiades-Hyades, and Sirius, when the statistical characteristics (mean, median, or mode) of the azimuthal velocity V-phi are used to analyze the distribution in the vertical position-velocity plane. This result does not invoke external perturbations and is independent of the internal dynamical mechanisms from which the MGs originate. Our conclusions counterbalance current arguments in favor of short-lived (between 300 and 900 Myr) structures in the solar neighborhood. Contrarily, they support the hypothesis of a longer formation timescale (around a few gigayears) for the MGs. (AU)

FAPESP's process: 17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way
Grantee:Maria de Los Angeles Perez Villegas
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program