Abstract

Gas in the Milky Way is driven inwards by its bar, some of it settling into a disk extending to Galactocentric radius \$1.4 \kpc\$. The stellar distribution in this region has not been well understood because of stellar crowding and high extinction. Here we use a high resolution simulation of a barred galaxy, which crucially includes gas and star formation, to guide our interpretation of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) stellar velocity data for the inner Milky Way. We show that the data favor the presence of a thin, rapidly-rotating, nuclear disk extending to \$\sim 1 \kpc\$. This is the first detection of a nuclear stellar disk in the Milky Way.

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