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The SPLASH Survey: Milky Way vs. M 31 dSphs

Published online by Cambridge University Press:  11 July 2011

M. Koleva ,
Ph. Prugniel ,
I. Vauglin ,
J.S. Kalirai ,
R.L. Beaton ,
S.R. Majewski ,
J.C. Ostheimer ,
R.J. Patterson ,
M.C. Geha  and
K.M. Gilbert
...Show all authors
J.S. Kalirai
Affiliation:
STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA
R.L. Beaton
Affiliation:
Department of Astronomy, University of Virginia, PO Box 3818, Charlottesville, VA 22903, USA
S.R. Majewski
Affiliation:
Department of Astronomy, University of Virginia, PO Box 3818, Charlottesville, VA 22903, USA
J.C. Ostheimer
Affiliation:
Department of Astronomy, University of Virginia, PO Box 3818, Charlottesville, VA 22903, USA
R.J. Patterson
Affiliation:
Department of Astronomy, University of Virginia, PO Box 3818, Charlottesville, VA 22903, USA
M.C. Geha
Affiliation:
Astronomy Department, Yale University, New Haven, CT 06510, USA
K.M. Gilbert
Affiliation:
Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195, USA
P. Guhathakurta
Affiliation:
UCO/Lick, Astronomy, UCSC, 1156 High Street, Santa Cruz, CA 95064, USA
E.N. Kirby
Affiliation:
Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
J. Wolf
Affiliation:
Center for Cosmology, Department of Physics and Astronomy, University of California at Irvine, Irvine, CA 92697, USA
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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 107 L⊙, 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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 48: CRAL-2010 A Universe of Dwarf Galaxies , 2011 , pp. 329 - 335
Copyright
© EAS, EDP Sciences, 2011

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