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Sunyaev-Zel'dovich distortion from early galactic winds
Subhabrata Majumdar, Biman Nath, Masashi Chiba
We consider the distortion in the cosmic microwave background (CMB) due to galactic winds at high redshift. Winds outflowing from galaxies have been hypothesized to be possible sou…
Stellar Kinematics of the Spiral Structure in the Solar Neighborhood
Taihei Yano, Masashi Chiba, Naoteru Gouda
We present a method, based on the kinematic analysis of the Galactic disk stars, to clarify whether the internal motions of the stellar system in spiral arms follow those expected…
Structure of the Galactic Stellar Halo Prior to Disk Formation
Masashi Chiba, Timothy C. Beers
We develop a method for recovering the global density distribution of the ancient Galactic stellar halo prior to disk formation, based on the present orbits of metal-poor stars obs…
Formation of the Galactic stellar halo. Origin of the metallicity-eccentricity relation
Kenji Bekki, Masashi Chiba
Motivated by the recently improved knowledge on the kinematic and chemical properties of the Galactic metal-poor stars, we present the numerical simulation for the formation of the…
Kinematics of Metal-Poor Stars in the Galaxy. II. Proper Motions for a Large Non-Kinematically Selected Sample
T. C. Beers, M. Chiba, Y. Yoshii +4
We present a revised catalog of 2106 Galactic stars, selected without kinematic bias, and with available radial velocities, distance estimates, and metal abundances in the range 0.…
Kinematics of Metal-Poor Stars in the Galaxy. III. Formation of the Stellar Halo and Thick Disk as Revealed from a Large Sample of Non-Kinematically Selected Stars
M. Chiba, T. C. Beers
(Abbreviated) We present a detailed analysis of the space motions of 1203 solar-neighborhood stars with metal abundances [Fe/H] <= -0.6, on the basis of a recently revised and supp…