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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

On the Stellar Velocity Distribution in the Solar Neighborhood in Light of Gaia DR2

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Autor(es):
Michtchenko, Tatiana A. [1] ; Lepine, Jacques R. D. [1] ; Perez-Villegas, Angeles [1] ; Vieira, Ronaldo S. S. [1] ; Barros, Douglas A. [2]
Número total de Autores: 5
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, Pernambuco - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Astrophysical Journal Letters; v. 863, n. 2 AUG 20 2018.
Citações Web of Science: 4
Resumo

The aim of this Letter is to contribute to the understanding of the stellar velocity distribution in the solar neighborhood (SN). We propose that the structures on the U-V planes, known as the moving groups, can be mainly explained by the spiral arms perturbations. The applied model of the Galactic disk and spiral arms, with the parameters defined by observational data and with pattern speed Omega(p) = 28.0 km s(-1) kpc(-1), is the same that allowed us to explain the origin of the Local Arm and the Sun's orbit trapped inside the corotation resonance (CR). We show that the U-V picture of the SN consists of the main component, associated with the CR, and the inner and outer structures, which we could associate with the Hercules and Sirius streams, respectively. The Coma-Berenices and Hyades-Pleiades groups, and the Sun itself, belong to the main part. The substructures of Hercules are formed mainly by the nearby 8/1, 12/1, and even 6/1 inner Lindblad resonances, while Sirius is shaped by the bulk of overlapping outer Lindblad resonances, -8/1, -12/1, -16/1, which are stuck to the CR. This richness in resonances only exists near corotation, which should be of the spiral arms, not of the Galactic bar, whose stable corotation zone is far away from the Sun. The model's predictions of the velocity distribution match qualitatively and quantitatively the distribution provided by Gaia data release 2. (AU)

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
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
Processo FAPESP: 17/15893-1 - Órbitas de aglomerados globulares do bojo: formação e evolução da Via Láctea
Beneficiário:Maria de Los Angeles Perez Villegas
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/10577-9 - Caos e integrabilidade em discos galácticos
Beneficiário:Ronaldo Savioli Sumé Vieira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado