Implications for dwarf spheroidal mass content from interloper removal

A. L. Serra, G. W. Angus, A. Diaferio

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    Using the caustic method, we identify the member stars of five dwarf spheroidal (dSph) galaxies of the Milky Way, the smallest dark matter (DM) dominated systems in the Universe. After our interloper rejection, we compute line-of-sight velocity dispersion profiles that are substantially smoother than previous results. Moreover, two dSphs have line-of-sight velocity dispersions 20% smaller than previous calculations suggested. Our Jeans modelling confirms that the DM content interior to 300 pc is roughly constant with satellite luminosity. Finally, if we assume that MOND provides the true law of gravity, our identification of interlopers implies that four dSphs have mass-to-light ratios in agreement with stellar population synthesis models, whereas Carina still has a mass-to-light ratio a factor of two too large and remains a problem for MOND.

    Original languageEnglish
    Article numberA16
    JournalAstronomy and Astrophysics
    Volume524
    Issue number1
    DOIs
    Publication statusPublished - Nov 19 2010

    Fingerprint

    mass to light ratios
    line of sight
    dark matter
    dwarf galaxies
    rejection
    alkalies
    universe
    luminosity
    gravity
    gravitation
    stars
    synthesis
    profiles
    modeling
    removal
    calculation
    method

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

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    abstract = "Using the caustic method, we identify the member stars of five dwarf spheroidal (dSph) galaxies of the Milky Way, the smallest dark matter (DM) dominated systems in the Universe. After our interloper rejection, we compute line-of-sight velocity dispersion profiles that are substantially smoother than previous results. Moreover, two dSphs have line-of-sight velocity dispersions 20{\%} smaller than previous calculations suggested. Our Jeans modelling confirms that the DM content interior to 300 pc is roughly constant with satellite luminosity. Finally, if we assume that MOND provides the true law of gravity, our identification of interlopers implies that four dSphs have mass-to-light ratios in agreement with stellar population synthesis models, whereas Carina still has a mass-to-light ratio a factor of two too large and remains a problem for MOND.",
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    Implications for dwarf spheroidal mass content from interloper removal. / Serra, A. L.; Angus, G. W.; Diaferio, A.

    In: Astronomy and Astrophysics, Vol. 524, No. 1, A16, 19.11.2010.

    Research output: Contribution to journalArticle

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    AU - Serra, A. L.

    AU - Angus, G. W.

    AU - Diaferio, A.

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