TL;DR
This paper investigates how chaos and galactic structures like the bar and spiral arms influence the local phase space in the solar neighborhood, using simulations and stellar velocity data.
Contribution
It demonstrates that including both the galactic bar and spiral pattern is essential to accurately model the local phase space, highlighting the role of chaos in its formation.
Findings
Chaos is a key factor in shaping the local phase space.
Combined effects of the galactic bar and spiral arms are necessary for accurate modeling.
Simulations match observed stellar velocity distributions when chaos is included.
Abstract
We attempt to understand the state of the local phase space by comparing simulated 2-D velocity distributions to the distribution that is constructed for the solar neighbourhood, from measurements of stellar radial and transverse velocities. The joint perurbation of the central bar in the Galaxy and the spiral pattern is found to be a must, in order to produce successful models of the local phase space. The existence of chaos is found to be an important ingredient in the formation of the observed phase space structure.
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