The Dynamical Origin of the Local Arm and the Sun's Trapped Orbit

Autor(es)

Lepine, Jacques R. D. ; Michtchenko, Tatiana A. ; Barros, Douglas A. ; Vieira, Ronaldo S. S.

• Tipo de documento: Artigo Científico
• Fonte: ASTROPHYSICAL JOURNAL; v. 843, n. 1 JUL 1 2017.
• Citações Web of Science: 7

Resumo

The Local Arm of the Milky Way, a short spiral feature near the Sun whose existence has been known for decades, was recently observed in detail with different tracers. Many efforts have been dedicated to elaborate plausible hypotheses concerning the origin of the main spiral arms of the Galaxy; however, up to now, no specific mechanism for the origin of the Local Arm has been proposed. Here we explain, for the first time, the Local Arm as an outcome of the spiral corotation resonance, which traps arm tracers and the Sun inside it. We show that the majority of maser sources belonging to the Local Arm, together with the Sun, evolve inside the corotation resonance, never crossing the main spiral arms but instead oscillating in the region between them. This peculiar behavior of the Sun could have numerous consequences for our understanding of the local kinematics of stars, the Galactic Habitable Zone, and the solar system evolution. (AU)

• Processo FAPESP: 15/10577-9 - Caos e integrabilidade em discos galácticos
• Beneficiário: Ronaldo Savioli Sumé Vieira
• 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
• Processo FAPESP: 16/18886-3 - Origem dos moving groups e estabilidade dinâmica do sol na galáxia
• Beneficiário: Douglas Augusto de Barros
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado