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Structure and kinematics of edge-on galaxy discs - IV. The kinematics of the stellar discs
- Source :
- Monthly Notices of the Royal Astronomical Society, 358(2), 481-502. Oxford University Press
- Publication Year :
- 2005
- Publisher :
- Oxford University Press (OUP), 2005.
-
Abstract
- The stellar disc kinematics in a sample of fifteen intermediate- to late-type edge-on spiral galaxies are studied using a dynamical modeling technique. The sample covers a substantial range in maximum rotation velocity and deprojected face-on surface brightness and contains seven spirals with either a boxy- or peanut-shaped bulge. Dynamical models of the stellar discs are constructed using the disc structure from $I$-band surface photometry and rotation curves observed in the gas. The differences in the line-of-sight stellar kinematics between the models and absorption line spectroscopy are minimized using a least-squares approach. The modeling constrains the disc surface density and stellar radial velocity dispersion at a fiducial radius through the free parameter $\sqrt{M/L}$ $(\sigma_{\rm z}/\sigma_{\rm R})^{-1}$, where $\sigma_{\rm z}/\sigma_{\rm R}$ is the ratio of vertical and radial velocity dispersion and $M/L$ the disc mass-to-light ratio. For thirteen spirals a transparent model provides a good match to the mean line-of-sight stellar velocity dispersion. Models that include a realistic radiative transfer prescription confirm that the effect of dust on the observable stellar kinematics is small at the observed slit positions. We discuss possible sources of systematic error and conclude that most of these are likely to be small. The exception is the neglect of the dark halo gravity, which has probably caused an overestimate of the surface density in the case of low surface brightness discs.<br />Comment: Accepted for publication by the Monthly Notices of the R.A.S
- Subjects :
- Brightness
FOS: Physical sciences
galaxies : kinematics and dynamics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Flattening
Photometry (optics)
GALACTIC DISKS
3-DIMENSIONAL DISTRIBUTION
RADIATIVE-TRANSFER
galaxies : fundamental parameters
galaxies : structure
Surface brightness
DOMINATED GALAXIES
Astrophysics::Galaxy Astrophysics
Physics
Spiral galaxy
INTERSTELLAR-MEDIUM
Astrophysics (astro-ph)
Velocity dispersion
Astronomy and Astrophysics
BAND SURFACE PHOTOMETRY
Galaxy
Dark matter halo
Space and Planetary Science
MILKY-WAY
galaxies : spiral
VELOCITY DISPERSION
Astrophysics::Earth and Planetary Astrophysics
SPIRAL GALAXIES
INTERNAL EXTINCTION
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 358
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....6b6b684f28705060bd5dc5323776d361
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2005.08811.x