| Autor: |
Lian, Jianhui, Zasowski, Gail, Hasselquist, Sten, Holtzman, Jon A, Boardman, Nicholas, Cunha, Katia, Fernández-Trincado, José G, Frinchaboy, Peter M, Garcia-Hernandez, DA, Nitschelm, Christian, Lane, Richard R, Thomas, Daniel, Zhang, Kai |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society, vol 511, iss 4 |
| Popis: |
Stellar radial migration plays an important role in reshaping a galaxy's structure and the radial distribution of stellar population properties. In this work, we revisit reported observational evidence for radial migration and quantify its strength using the age-[Fe/H] distribution of stars across the Milky Way with APOGEE data. We find a broken age-[Fe/H] relation in the Galactic disc at r > 6 kpc, with a more pronounced break at larger radii. To quantify the strength of radial migration, we assume stars born at each radius have a unique age and metallicity, and then decompose the metallicity distribution function (MDF) of mono-age young populations into different Gaussian components that originated from various birth radii at rbirth < 13 kpc. We find that, at ages of 2 and 3 Gyr, roughly half the stars were formed within 1 kpc of their present radius, and very few stars ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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