Fig. 2 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. 2.

Sample spectra of foreground dwarfs (top) and M31 red giants (bottom) with low and higher S/N ratios. The low‐S/N data (﹩\mathrm{S}\,/ \mathrm{N}\,=6﹩ and 8) represent the approximate limit for which velocities and CaT metallicities could be barely determined; the S/N for the higher quality spectra are ~120 (top) and ~20 (bottom). Indicated are the wavelength regions of the surface gravity–sensitive sodium doublet and the CaT.

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