Kinematic and Chemical Constraints on the Formation of M31's Inner and Outer Halo

Koch, Andreas,   Rich, R. Michael,   Reitzel, David B.,   Martin, Nicolas F.,   Ibata, Rodrigo A.,   Chapman, Scott C.,   Majewski, Steven R.,   Mori, Masao,   Loh, Yeong-Shang,   Ostheimer, James C.,   & Tanaka, Mikito

要旨