Kinematic Detection of the Galactic Nuclear Disc
Astrophysics of Galaxies
2015-10-21 v2
Abstract
We report the detection of the Galactic nuclear disc in line-of-sight kinematics of stars, measured with infrared spectroscopy from APOGEE. This stellar component of the nuclear disc has an extent and rotation velocity V ~ 120kms comparable to the gas disc in the central molecular zone. The current data suggest that this disc is kinematically cool and has a small vertical extent of order 50pc. The stellar kinematics suggest a truncation radius/steep decline of the stellar disc at a galactocentric radius R ~ 150pc, and provide tentative evidence for an overdensity at the position of the ring found in the molecular gas disc.
Keywords
Cite
@article{arxiv.1507.02695,
title = {Kinematic Detection of the Galactic Nuclear Disc},
author = {Ralph Schönrich and Michael Aumer and Stuart E. Sale},
journal= {arXiv preprint arXiv:1507.02695},
year = {2015}
}
Comments
6 pages, 4 figures, accepted by ApJ Letters