Towards Unveiling the Origins of the Milky Way Bulge through Multi-band-Messenger Sky Surveys
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910055761182720 |
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| author | Wang, Hai-Feng Han, Xiao Carraro, Giovanni Lopez-Corredoira, Martin Ting, Yuan-Sen Wang, Guan-Yu |
| author_facet | Wang, Hai-Feng Han, Xiao Carraro, Giovanni Lopez-Corredoira, Martin Ting, Yuan-Sen Wang, Guan-Yu |
| contents | We analyze the structure and chemo-dynamical properties of the Galactic bulge using ab-type RR Lyrae stars (RRabs) from OGLE-IV and giant stars from APOGEE and Gaia. Orbital integration of 1,879 RRab variables reveals three populations: central bulge, inner bulge, and halo/disk contaminants. Inner bulge RRabs display bar-like kinematics, whereas central bulge stars show slower rotation and lower dispersion. APOGEE data for 28,188 stars confirm these kinematic trends and reveal a bimodal chemical distribution, indicating distinct formation pathways. Our results support a pseudo-bulge origin of the inner bulge through disk instability, with the overall morphology better described as boxy rather than X-shaped. Through the integration of multi-messenger, multi-band data, our collaboration aims to provide deeper insights into the physical properties and evolutionary history of the Galactic bulge. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_18708 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Towards Unveiling the Origins of the Milky Way Bulge through Multi-band-Messenger Sky Surveys Wang, Hai-Feng Han, Xiao Carraro, Giovanni Lopez-Corredoira, Martin Ting, Yuan-Sen Wang, Guan-Yu Astrophysics of Galaxies We analyze the structure and chemo-dynamical properties of the Galactic bulge using ab-type RR Lyrae stars (RRabs) from OGLE-IV and giant stars from APOGEE and Gaia. Orbital integration of 1,879 RRab variables reveals three populations: central bulge, inner bulge, and halo/disk contaminants. Inner bulge RRabs display bar-like kinematics, whereas central bulge stars show slower rotation and lower dispersion. APOGEE data for 28,188 stars confirm these kinematic trends and reveal a bimodal chemical distribution, indicating distinct formation pathways. Our results support a pseudo-bulge origin of the inner bulge through disk instability, with the overall morphology better described as boxy rather than X-shaped. Through the integration of multi-messenger, multi-band data, our collaboration aims to provide deeper insights into the physical properties and evolutionary history of the Galactic bulge. |
| title | Towards Unveiling the Origins of the Milky Way Bulge through Multi-band-Messenger Sky Surveys |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.18708 |