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

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; howe...

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Bibliographic Details
Published in:The Astrophysical journal 2017-07, Vol.843 (1), p.48
Main Authors: Lépine, Jacques R. D., Michtchenko, Tatiana A., Barros, Douglas A., Vieira, Ronaldo S. S.
Format: Article
Language:English
Subjects:
Astrophysics
Circumstellar habitable zone
Corotation
Galactic evolution
Galactic structure
Galaxies
Galaxy: disk
kinematics and dynamics
Milky Way
Resonance
solar neighborhood
Solar system
Solar system evolution
Stellar evolution
Stellar kinematics
structure
Tracers
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Summary: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.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa72e5