Galactic disk structure as revealed by LAMOST A stars
Abstract
Using the spectroscopic distances of over 0.12 million A-type stars selected from the LAMOST Spectroscopic Survey of the Galactic Anti-center (LSS-GAC), we map their three-dimensional number density distributions in the Galaxy. These stellar number density maps allow an investigation of the Galactic young age thin disk structure with no a priori assumptions about the functional form of its components. The data show strong evidence for a significant flaring young disk. A more detail analysis show that the stellar flaring have different behaviours between the Northern and the Southern Galactic disks. The maps also reveal spatially coherent, kpc-scale stellar substructure in the thin disk. Finally, we detect the Perseus arm stellar overdensity at R ~ 10 kpc.
- Publication:
-
Astrometry and Astrophysics in the Gaia Sky
- Pub Date:
- April 2018
- DOI:
- 10.1017/S1743921317006214
- Bibcode:
- 2018IAUS..330..208C
- Keywords:
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- Galaxy: disk;
- Galaxy: structure