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Structure and Kinematics of the Stellar Halos and Thick Disks of the Milky Way Based on Calibration Stars from SDSS DR7
Daniela Carollo, Timothy C. Beers, Masashi Chiba +6
The structure and kinematics of the recognized stellar components of the Milky Way are explored, based on well-determined atmospheric parameters and kinematic quantities for 32360…
Structure and Population of the Andromeda Stellar Halo from a Subaru/Suprime-Cam Survey
M. Tanaka, M. Chiba, Y. Komiyama +3
We present a photometric survey of the stellar halo of the Andromeda galaxy, using Suprime-Cam on the Subaru Telescope. A detailed analysis of VI color-magnitude diagrams of the re…
Chemical Compositions of Kinematically Selected Outer Halo Stars
Lan Zhang, Miho Ishigaki, Wako Aoki +2
Chemical abundances of 26 metal-poor dwarfs and giants are determined from high-resolution and high signal-to-noise ratio spectra obtained with Subaru/HDS. The sample is selected s…
On the Size Evolution of a Galactic Disk in Hierarchical Merging of Cold Dark Matter Halos
Hirohito Hayashi, Masashi Chiba
We investigate the dynamical effects of dark matter subhalos on the structure and evolution of a galactic disk, using semi-analytic method that includes approximated and empirical…
Role of galactic gaseous halos in recycling enriched winds from bulges to disks: A new bulge-disk chemical connection
K. Bekki, T. Tsujimoto, M. Chiba
We demonstrate for the first time that gaseous halos of disk galaxies can play a vital role in recycling metal-rich gas ejected from the bulges and thus in promoting chemical evolu…