Fig. 19 from Kinematic and Chemical Constraints on the Formation of M31’s Inner and Outer Halo

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

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

Koch et al. 2008 The Astrophysical Journal 689 958.

Provider: AAS Journals

Caption: Fig. 19.

Left: Metallicity and velocities for giant candidates in the outermost regions >40 kpc (small black dots). Different symbols highlight the distributions in the three outer fields. Also indicated are the velocity number distributions of the M31 halo (at a mean of −300 km s⁻¹) and that of M33 (around −180 km s⁻¹) with arbitrary scaling. Right: Velocity histograms of these outer stars.

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