| Texto completo | |
| Autor(es): |
Michtchenko, Tatiana A.
[1]
;
Barros, Douglas A.
[2]
;
Perez-Villegas, Angeles
[1]
;
Lepine, Jacques R. D.
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ASTROPHYSICAL JOURNAL; v. 876, n. 1 MAY 1 2019. |
| Citações Web of Science: | 1 |
| Resumo | |
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) | |
| Processo FAPESP: | 17/15893-1 - Órbitas de aglomerados globulares do bojo: formação e evolução da Via Láctea |
| Beneficiário: | Maria de Los Angeles Perez Villegas |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL |
| Beneficiário: | Elisabete Maria de Gouveia Dal Pino |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |