Gaia DR3 Disentangles the Resonant Kinematics of the Milky Way's Bar and Spiral Arms
Fuente:
Zenodo
Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Recurso digital |
| Publié: |
Zenodo
2025
|
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866901820386836480 |
|---|---|
| author | Revista, Zen ASTRO, 10 |
| author_facet | Revista, Zen ASTRO, 10 |
| contents | The Milky Way's disk is a complex dynamical system shaped by the gravitational influence and interactions of its dominant non-axisymmetric components: the central bar and the spiral arms. Understanding the intricate resonant kinematics induced by these structures is paramount to deciphering the evolution and current state of our Galaxy. Previous observational efforts have struggled to unambiguously disentangle the individual kinematic signatures of the bar and spiral arms, primarily due to projection effects and the inherent limitations of 2D astrometry. The third data release (DR3) from the Gaia mission has revolutionized galactic astronomy by providing unprecedented six-dimensional phase-space information (positions and velocities) for an enormous number of stars across a significant volume of the Milky Way disk. This paper leverages the high-precision astrometry and radial velocities from Gaia DR3 to meticulously dissect and disentangle the resonant kinematic imprints left by the Galactic bar and spiral arms. Through detailed analysis of stellar velocity distributions, particularly in the radial and azimuthal components, across various Galactic regions, we identify distinct kinematic substructures attributable to each component. We pinpoint the locations of major Lindblad and corotation resonances for both the bar and spiral arms, providing robust estimates for their respective pattern speeds. Our findings demonstrate that Gaia DR3 data allows for a clear separation of these overlapping resonant features, offering crucial new insights into their interaction, coupling, and their collective role in shaping the disk's evolution. This work significantly advances our understanding of the Milky Way's dynamic architecture and serves as a cornerstone for future investigations into galactic dynamics. |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_17754996 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Gaia DR3 Disentangles the Resonant Kinematics of the Milky Way's Bar and Spiral Arms Revista, Zen ASTRO, 10 The Milky Way's disk is a complex dynamical system shaped by the gravitational influence and interactions of its dominant non-axisymmetric components: the central bar and the spiral arms. Understanding the intricate resonant kinematics induced by these structures is paramount to deciphering the evolution and current state of our Galaxy. Previous observational efforts have struggled to unambiguously disentangle the individual kinematic signatures of the bar and spiral arms, primarily due to projection effects and the inherent limitations of 2D astrometry. The third data release (DR3) from the Gaia mission has revolutionized galactic astronomy by providing unprecedented six-dimensional phase-space information (positions and velocities) for an enormous number of stars across a significant volume of the Milky Way disk. This paper leverages the high-precision astrometry and radial velocities from Gaia DR3 to meticulously dissect and disentangle the resonant kinematic imprints left by the Galactic bar and spiral arms. Through detailed analysis of stellar velocity distributions, particularly in the radial and azimuthal components, across various Galactic regions, we identify distinct kinematic substructures attributable to each component. We pinpoint the locations of major Lindblad and corotation resonances for both the bar and spiral arms, providing robust estimates for their respective pattern speeds. Our findings demonstrate that Gaia DR3 data allows for a clear separation of these overlapping resonant features, offering crucial new insights into their interaction, coupling, and their collective role in shaping the disk's evolution. This work significantly advances our understanding of the Milky Way's dynamic architecture and serves as a cornerstone for future investigations into galactic dynamics. |
| title | Gaia DR3 Disentangles the Resonant Kinematics of the Milky Way's Bar and Spiral Arms |
| url | https://doi.org/10.5281/zenodo.17754996 |