LOCAL GROUP DWARF SPHEROIDALS: CORRELATED DEVIATIONS FROM THE BARYONIC TULLY-FISHER RELATION
- Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States)
- Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575 (United States)
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.
- OSTI ID:
- 21464714
- Journal Information:
- Astrophysical Journal, Vol. 722, Issue 1; Other Information: DOI: 10.1088/0004-637X/722/1/248; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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