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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. 15.

Strong abundance gradient, already qualitatively visible in the top left panel, which shows the strength of the TiO band at 7100 Å in our entire giant sample (black points) vs. radial distance. Note that dwarfs (red crosses) cover the full range in TiO strengths at all radii. The radial metallicity gradient is then clearly present in the spectroscopic MDFs in three different radial bins (top right, solid lines) and for our dwarf‐cleaned CaT sample (bottom). However, none of the distributions fully resembles the stream component (shaded histogram). Note that there are no metal‐rich stars beyond ~50 kpc.

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