Journal
ASTROPHYSICAL JOURNAL
Volume 722, Issue 1, Pages 248-261Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/722/1/248
Keywords
dark matter; galaxies: dwarf; galaxies: formation; galaxies: halos; Local Group
Categories
Funding
- NSF [AST 0908370]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908370] Funding Source: National Science Foundation
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Local Group dwarf spheroidal satellite galaxies are the faintest extragalactic stellar systems known. We examine recent data for these objects in the plane of the Baryonic Tully-Fisher Relation (BTFR). While some dwarf spheroidals adhere to the BTFR, others deviate substantially. We examine the residuals from the BTFR and find that they are not random. The residuals correlate with luminosity, size, metallicity, ellipticity, and susceptibility of the dwarfs to tidal disruption in the sense that fainter, more elliptical, and tidally more susceptible dwarfs deviate farther from the BTFR. These correlations disfavor stochastic processes and suggest a role for tidal effects. We identify a test to distinguish between Lambda CDM and MOND based on the orbits of the dwarf satellites of the Milky Way and how stars are lost from them.
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