Disk mass and disk heating in the spiral galaxy NGC 3223

G. Gentile, C. Tydtgat, M. Baes, G. De Geyter, M. Koleva, G. W. Angus, W. J.G. De Blok, W. Saftly, S. Viaene

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    We present the stellar and gaseous kinematics of an Sb galaxy, NGC 3223, with the aim of determining the vertical and radial stellar velocity dispersion as a function of radius, which can help to constrain disk heating theories. Together with the observed NIR photometry, the vertical velocity dispersion is also used to determine the stellar mass-to-light (M/L) ratio, typically one of the largest uncertainties when deriving the dark matter distribution from the observed rotation curve. We find a vertical-to-radial velocity dispersion ratio of σzR = 1.21 ± 0.14, significantly higher than expectations from known correlations, and a weakly-constrained Ks-band stellar M/L ratio in the range 0.5-1.7, which is at the high end of (but consistent with) the predictions of stellar population synthesis models. Such a weak constraint on the stellar M/L ratio, however, does not allow us to securely determine the dark matter density distribution. To achieve this, either a statistical approach or additional data (e.g. integral-field unit) are needed.

    Original languageEnglish
    Article numberA57
    JournalAstronomy and Astrophysics
    Volume576
    DOIs
    Publication statusPublished - Apr 1 2015

    Fingerprint

    mass to light ratios
    spiral galaxies
    stellar mass
    heating
    dark matter
    radial velocity
    photometry
    density distribution
    kinematics
    galaxies
    radii
    curves
    synthesis
    prediction
    predictions
    distribution

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Gentile, G., Tydtgat, C., Baes, M., De Geyter, G., Koleva, M., Angus, G. W., ... Viaene, S. (2015). Disk mass and disk heating in the spiral galaxy NGC 3223. Astronomy and Astrophysics, 576, [A57]. https://doi.org/10.1051/0004-6361/201425279
    Gentile, G. ; Tydtgat, C. ; Baes, M. ; De Geyter, G. ; Koleva, M. ; Angus, G. W. ; De Blok, W. J.G. ; Saftly, W. ; Viaene, S. / Disk mass and disk heating in the spiral galaxy NGC 3223. In: Astronomy and Astrophysics. 2015 ; Vol. 576.
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    Gentile, G, Tydtgat, C, Baes, M, De Geyter, G, Koleva, M, Angus, GW, De Blok, WJG, Saftly, W & Viaene, S 2015, 'Disk mass and disk heating in the spiral galaxy NGC 3223', Astronomy and Astrophysics, vol. 576, A57. https://doi.org/10.1051/0004-6361/201425279

    Disk mass and disk heating in the spiral galaxy NGC 3223. / Gentile, G.; Tydtgat, C.; Baes, M.; De Geyter, G.; Koleva, M.; Angus, G. W.; De Blok, W. J.G.; Saftly, W.; Viaene, S.

    In: Astronomy and Astrophysics, Vol. 576, A57, 01.04.2015.

    Research output: Contribution to journalArticle

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    AU - Angus, G. W.

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