The stellar halo of the Galaxy
arXiv:0804.0019 · doi:10.1007/s00159-008-0009-6
Abstract
Stellar halos may hold some of the best preserved fossils of the formation history of galaxies. They are a natural product of the merging processes that probably take place during the assembly of a galaxy, and hence may well be the most ubiquitous component of galaxies, independently of their Hubble type. This review focuses on our current understanding of the spatial structure, the kinematics and chemistry of halo stars in the Milky Way. In recent years, we have experienced a change in paradigm thanks to the discovery of large amounts of substructure, especially in the outer halo. I discuss the implications of the currently available observational constraints and fold them into several possible formation scenarios. Unraveling the formation of the Galactic halo will be possible in the near future through a combination of large wide field photometric and spectroscopic surveys, and especially in the era of Gaia.
46 pages, 16 figures. References updated and some minor changes. Full-resolution version available at http://www.astro.rug.nl/~ahelmi/stellar-halo-review.pdf
References in corpus (13)
- The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
- The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
- Two Stellar Components in the Halo of the Milky Way
- The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
- Discovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
- The Hercules-Aquila Cloud
- Infall of substructures onto a Milky Way-like dark halo
- The Overdensity in Virgo, Sagittarius Debris, and the Asymmetric Spheroid
- Satellites of Simulated Galaxies: survival, merging, and their relation to the dark and stellar halos
- Halo Star Streams in the Solar Neighborhood
- Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample
- Kinematic Structure in the Galactic Halo at the North Galactic Pole: RR Lyrae and BHB Stars show different kinematics
- The structure of the Galactic halo: SDSS versus SuperCOSMOS