Author ORCID Identifier
Document Type
Article
Publication Date
9-17-2010
Abstract
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 ΔCDM and MOND based on the orbits of the dwarf satellites of the Milky Way and how stars are lost from them. © 2010. The American Astronomical Society. All rights reserved.
Keywords
dark matter, galaxies: dwarf, galaxies: formation, galaxies: halos, local group
Language
English
Publication Title
Astrophysical Journal
Grant
908370
Rights
© The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material
Recommended Citation
Stacy S. McGaugh and Joe Wolf 2010. Local Group Dwarf Spheroidals: Correlated Deviations from the Baryonic Tully-Fisher Relation. ApJ 722 248
Manuscript Version
Final Publisher Version