1206.3842 (Jing Li et al.)

On Rings and Streams in the Galactic Anti-Center    [PDF]

Jing Li, Heidi Jo Newberg, Jeffrey L. Carlin, Licai Deng, Matthew Newby, Benjamin A. Willett, Yan Xu, Zhiquan Luo

We confirm that there are at least three separate low-latitude over-densities of blue F turnoff stars near the Milky Way anti-center: the Monoceros Ring, the Anti-Center Stream (ACS), and the Eastern Banded Structure (EBS). There might also be a small number of normal thick disk stars at the same location. The ACS is a tilted component that extends to higher Galactic latitude at lower Galactic longitude, 10 kpc from the Sun towards the anti-center. It has a sharp cutoff on the high latitude side. Distance, velocity, and proper motion measurements are consistent with previous orbit fits. The mean metallicity is [Fe/H]$=-0.96 \pm 0.03$, which is lower than the thick disk and Monoceros Ring. The Monoceros Ring is a higher density substructure that is present at $15\arcdegView original: http://arxiv.org/abs/1206.3842