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Disk mass and disk heating in the spiral galaxy NGC 3223

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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 sigma(z)/sigma(R) = 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.
Keywords
galaxies: individual: NGC 3223, galaxies: kinematics and dynamics, galaxies: structure, SURFACE BRIGHTNESS GALAXIES, RESOLUTION ROTATION CURVES, TO-LIGHT-RATIO, DARK-MATTER, DWARF GALAXIES, BARYONIC MATTER, GALACTIC DISCS, STAR-FORMATION, STELLAR DISCS, HALO MASS

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Citation

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MLA
Gentile, Gianfranco et al. “Disk Mass and Disk Heating in the Spiral Galaxy NGC 3223.” ASTRONOMY & ASTROPHYSICS 576 (2015): n. pag. Print.
APA
Gentile, G., Tydtgat, C., Baes, M., De Geyter, G., Koleva, M., Angus, G., de Blok, W., et al. (2015). Disk mass and disk heating in the spiral galaxy NGC 3223. ASTRONOMY & ASTROPHYSICS, 576.
Chicago author-date
Gentile, Gianfranco, C Tydtgat, Maarten Baes, Gert De Geyter, Mina Koleva, GW Angus, WJG de Blok, Waad Saftly, and Sébastien Viaene. 2015. “Disk Mass and Disk Heating in the Spiral Galaxy NGC 3223.” Astronomy & Astrophysics 576.
Chicago author-date (all authors)
Gentile, Gianfranco, C Tydtgat, Maarten Baes, Gert De Geyter, Mina Koleva, GW Angus, WJG de Blok, Waad Saftly, and Sébastien Viaene. 2015. “Disk Mass and Disk Heating in the Spiral Galaxy NGC 3223.” Astronomy & Astrophysics 576.
Vancouver
1.
Gentile G, Tydtgat C, Baes M, De Geyter G, Koleva M, Angus G, et al. Disk mass and disk heating in the spiral galaxy NGC 3223. ASTRONOMY & ASTROPHYSICS. 2015;576.
IEEE
[1]
G. Gentile et al., “Disk mass and disk heating in the spiral galaxy NGC 3223,” ASTRONOMY & ASTROPHYSICS, vol. 576, 2015.
@article{5966632,
  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 sigma(z)/sigma(R) = 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.},
  articleno    = {A57},
  author       = {Gentile, Gianfranco and Tydtgat, C and Baes, Maarten and De Geyter, Gert and Koleva, Mina and Angus, GW and de Blok, WJG and Saftly, Waad and Viaene, Sébastien},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {galaxies: individual: NGC 3223,galaxies: kinematics and dynamics,galaxies: structure,SURFACE BRIGHTNESS GALAXIES,RESOLUTION ROTATION CURVES,TO-LIGHT-RATIO,DARK-MATTER,DWARF GALAXIES,BARYONIC MATTER,GALACTIC DISCS,STAR-FORMATION,STELLAR DISCS,HALO MASS},
  language     = {eng},
  pages        = {8},
  title        = {Disk mass and disk heating in the spiral galaxy NGC 3223},
  url          = {http://dx.doi.org/10.1051/0004-6361/201425279},
  volume       = {576},
  year         = {2015},
}

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