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The SPLASH Survey: Milky Way vs. M 31 dSphs

  • M. Koleva, Ph. Prugniel, I. Vauglin, J.S. Kalirai (a1), R.L. Beaton (a2), S.R. Majewski (a2), J.C. Ostheimer (a2), R.J. Patterson (a2), M.C. Geha (a3), K.M. Gilbert (a4), P. Guhathakurta (a5), E.N. Kirby (a6) and J. Wolf (a7)...

Abstract

We present the first systematic comparison of the detailed properties, including internal kinematics, chemical abundances, sizes, and dark matter masses, of Milky Way and M 31 dSphs as a part of the SPLASH Survey (Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo). Through Keck/DEIMOS spectroscopy of several hundred individual red giants in a half dozen M 31 galaxies, our results indicate both similarities and differences between the family of dSphs in the Milky Way and M 31. For example, we find that the luminosity-metallicity relation of dSphs in the two hosts is very similar between L = 105 and 107L, the size distribution of M 31 dSphs extends to larger values at the same luminosity compared to Milky Way counterparts (especially at the bright end), and that the dark matter masses of M 31 dSphs are slightly smaller than similar luminosity Milky Way galaxies.

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