Kinematics Of M31 dSphs And Implications For LCDM

Details Kinematics Of M31 dSphs And Implications For LCDM Kinematics Of M31 dSphs And Implications For LCDM

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920104t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #201.04

Mathematics

Logic

Scientific paper

The Milky Way dwarf spheroidal (dSph) population are a unique testbed for both galaxy formation and LCDM. They represent the lowest-luminosity extreme of star formation and as a result harbor a number of interesting puzzles when placed in a cosmological context. However, interpretation of these satellites is compromised by the fact that they have only been characterized around the Milky Way. Hence, I present results from the SPLASH survey, a large spectroscopic survey of M31, focusing on searching the dSph satellites for signs of similar puzzles. These reveal consistency between the Milky Way and M31 satellite populations, showing these problems are not unique to the Milky Way. In particular, I highlight the "Massive Failures" problem, showing that, like the Milky Way dSphs, none of M31's satellites are consistent with being embedded inside the largest dark matter subhalos expected to reside inside a halo like that of M31. This likely presents either a critical challenge to LCDM or a breakdown of predictability in galaxy formation for the faintest known galaxies.

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