Statistics – Computation
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.5401w&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #54.01; Bulletin of the American Astronomical Society, Vol. 28, p.1344
Statistics
Computation
1
Scientific paper
The photometric and kinematic structure of barred galaxies is complex; gas in bars shows strongly non-circular streaming motions. These non-axisymmetric motions respond directly to the mass of the luminous bar. This presents an opportunity to lift the ``maximum disk'' degeneracy of tradeoff of luminous disk mass against dark halo mass, encountered in fitting rotation curves of axisymmetric disk galaxies. Fully two-dimensional velocity fields with high spatial and velocity resolution are required to map the non-circular kinematics, and the gas flow pattern shows evidence of shocks within the bar and therefore requires fluid-dynamical modeling. We can constrain parameters of a bar, such as the M/L and pattern speed, by running gas-dynamical computations for a variety of models of the galaxy potential. We present 2-D velocity fields from Fabry-Perot Hα and VLA 21cm observations of barred galaxies. We compare to fluid-dynamical computations of the gas flow which use model potentials derived from I-band photometry, to determine the M/L and pattern speeds of the bars. We additionally use gas-dynamical models to constrain parameters of the Milky Way bar, by comparison with the 21cm data of Liszt & Burton (1980).
Sellwood Jeremy A.
van Gorkom Jacqueline H.
Weiner Benjamin J.
Williams Ted B.
No associations
LandOfFree
Structure and Dynamics of Barred Spiral Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Structure and Dynamics of Barred Spiral Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and Dynamics of Barred Spiral Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-817318