Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714703t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #147.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Substructure in LCDM provides a number of interesting puzzles. While the missing satellites problem is well-studied, there are suggestions of an opposite problem on the bright end. Subhalos large enough to host luminous satellites are uncommon, so we investigate whether the existence of the Large Magellanic Cloud (LMC) orbiting the Galaxy is a challenge for LCDM. We construct a volume limited sample of isolated galaxies in the Sloan Digital Sky Survey (SDSS) within which all LMC analogs would be visible. We search this sample for analogs to an isolated galaxy pair like the Milky Way/LMC system and interpret these results with cosmological simulations. We find that a significant fraction of Milky Way-like hosts host LMC-like satellites, closely matching the predictions of n-body simulations. However, we find that the LMC is remarkably blue for such satellites. This could imply that the LMC is on first infall as recent proper motions suggest.
Barton Elizabeth J.
Boylan-Kolchin Michael
Bullock James S.
Tollerud Erik J.
Trinh Christopher
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