Milky Way disc & Bulge in situ populations: ESO white paper - Expanding horizons call
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912772520935424 |
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| author | Bergemann, M. Kordopatis, G. Casali, G. Khoperskov, S. McMillan, P. Marques, L. Minchev, I. Poggio, E. Schultheis, M. Vázquez, C. Viscasillas Wang, H. -F. Grisoni, V. Hill, V. Smiljanic, R. |
| author_facet | Bergemann, M. Kordopatis, G. Casali, G. Khoperskov, S. McMillan, P. Marques, L. Minchev, I. Poggio, E. Schultheis, M. Vázquez, C. Viscasillas Wang, H. -F. Grisoni, V. Hill, V. Smiljanic, R. |
| contents | The formation and evolution of the Milky Way's disc, bar, and bulge remain fundamentally limited by the lack of a contiguous, Galaxy-wide, high-precision chemo-dynamical map. Key open questions - including the survival or destruction of the primitive discs, the origin of the bulge's multi-component structure, the role of mergers and secular processes, and the coupling between stellar chemistry, dynamics, and the Galactic potential - cannot be fully resolved with current or planned facilities. Existing spectroscopic surveys provide either high resolution for small samples or wide coverage at insufficient resolution and depth, and none can obtain homogeneous abundances, precise 3D kinematics, and reliable ages for the millions of stars required, particularly in the obscured midplane, the far side of the bar, or the outer, low-density disc. A new wide-field, massively multiplexed, large-aperture spectroscopic facility, capable of both high- and low-resolution spectroscopy over tens of thousands of square degrees, is therefore essential. Such a facility would deliver the statistical power, sensitivity, and completeness needed to reconstruct the Galaxy's assembly history, constrain its gravitational potential, and establish the Milky Way as the definitive benchmark for galaxy evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_15812 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Milky Way disc & Bulge in situ populations: ESO white paper - Expanding horizons call Bergemann, M. Kordopatis, G. Casali, G. Khoperskov, S. McMillan, P. Marques, L. Minchev, I. Poggio, E. Schultheis, M. Vázquez, C. Viscasillas Wang, H. -F. Grisoni, V. Hill, V. Smiljanic, R. Instrumentation and Methods for Astrophysics Astrophysics of Galaxies The formation and evolution of the Milky Way's disc, bar, and bulge remain fundamentally limited by the lack of a contiguous, Galaxy-wide, high-precision chemo-dynamical map. Key open questions - including the survival or destruction of the primitive discs, the origin of the bulge's multi-component structure, the role of mergers and secular processes, and the coupling between stellar chemistry, dynamics, and the Galactic potential - cannot be fully resolved with current or planned facilities. Existing spectroscopic surveys provide either high resolution for small samples or wide coverage at insufficient resolution and depth, and none can obtain homogeneous abundances, precise 3D kinematics, and reliable ages for the millions of stars required, particularly in the obscured midplane, the far side of the bar, or the outer, low-density disc. A new wide-field, massively multiplexed, large-aperture spectroscopic facility, capable of both high- and low-resolution spectroscopy over tens of thousands of square degrees, is therefore essential. Such a facility would deliver the statistical power, sensitivity, and completeness needed to reconstruct the Galaxy's assembly history, constrain its gravitational potential, and establish the Milky Way as the definitive benchmark for galaxy evolution. |
| title | Milky Way disc & Bulge in situ populations: ESO white paper - Expanding horizons call |
| topic | Instrumentation and Methods for Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.15812 |