Fast Star Formation in the Milky Way

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Source arXiv

Astrophysics of Galaxies

Fast Star Formation in the Milky Way

From dawn till disk: Milky Way's turbulent youth revealed by the APOGEE+Gaia data

We select a highly pure sample of stars with metallicity born in-situ in the galaxy proper to study the stellar kinematics as a function of metallicity.

We show that the low-metallicity in-situ component that we dub aurora is kinematically hot with an approximately isotropic velocity ellipsoid and a modest net rotation.

The median tangential velocity of the in-situ stars increases sharply with increasing metallicity between and the transition that we call the spin-up.

The observed and theoretically expected age-metallicity correlations imply that this increase reflects a rapid formation of the galactic disk over gyrs.

The transformation of the stellar kinematics as a function of [fe/h] is accompanied by a qualitative change in chemical abundances : the scatter drops sharply once the galaxy builds up a disk during later epochs corresponding to the spin-up.

Authors

Vasily Belokurov, Andrey Kravtsov

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