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Reconstructing the emergence of the Milky Way’s stellar population with Gaia, SDSS-V and JWST

Descripción del proyecto

Reconstrucción del origen y la evolución de la Vía Láctea

El universo está formado por billones de galaxias. La observación de otras galaxias proporciona información importante sobre el origen y la evolución del universo, pero la Vía Láctea es la única lo suficientemente cercana para generar voluminosos conjuntos de datos procedentes de experimentos de observación. Tres recientes lanzamientos de observación ofrecerán una precisión y exactitud tecnológicas sin precedentes. El equipo del proyecto financiado con fondos europeos EMERGE tiene previsto hacer un uso excelente de la gran cantidad de datos que estos enviarán a la Tierra sobre las estrellas y los restos estelares compactos de nuestra galaxia para construir un modelo de evolución química galáctica. La reconstrucción basada en observaciones de la historia de la formación estelar y la evolución química de la galaxia revelará sus antecesores y sus comportamientos a lo largo del tiempo.

Objetivo

Understanding how the Milky Way arrived at its present state requires a large volume of precision measurements of our Galaxy’s current makeup, as well as an empirically based understanding of the main processes involved in the Galaxy’s evolution. Such data are now about to arrive in the flood of quality information from Gaia and SDSS-V. The demography of the stars and of the compact stellar remnants in our Galaxy, in terms of phase-space location, mass, age, metallicity, and multiplicity are data products that will come directly from these surveys. I propose to integrate this information into a comprehensive picture of the Milky Way’s present state. In parallel, I will build a Galactic chemical evolution model, with input parameters that are as empirically based as possible, that will reproduce and explain the observations. To get those input parameters, I will measure the rates of supernovae (SNe) in nearby galaxies (using data from past and ongoing surveys) and in high-redshift proto-clusters (by conducting a SN search with JWST), to bring into sharp focus the element yields of SNe and the distribution of delay times (the DTD) between star formation and SN explosion. These empirically determined SN metal-production parameters will be used to find the observationally based reconstruction of the Galaxy’s stellar formation history and chemical evolution that reproduces the observed present-day Milky Way stellar population. The population census of stellar multiplicity with Gaia+SDSS-V, and particularly of short-orbit compact-object binaries, will hark back to the rates and the element yields of the various types of SNe, revealing the connections between various progenitor systems, their explosions, and their rates. The plan, while ambitious, is feasible, thanks to the data from these truly game-changing observational projects. My team will perform all steps of the analysis and will combine the results to obtain the clearest picture of how our Galaxy came to be.

Régimen de financiación

ERC-ADG - Advanced Grant

Institución de acogida

TEL AVIV UNIVERSITY
Aportación neta de la UEn
€ 1 859 375,00
Coste total
€ 1 859 375,00

Beneficiarios (1)