Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...644..214f&link_type=abstract
The Astrophysical Journal, Volume 644, Issue 1, pp. 214-228.
Astronomy and Astrophysics
Astronomy
30
Galaxy: Disk, Galaxy: Kinematics And Dynamics, Galaxy: Structure, Ism: Kinematics And Dynamics
Scientific paper
An advanced approach to the kinematic distance method is developed. The method is applicable to second- and third-quadrant Galactic objects with known velocities. It is based on fitting a model of the density and velocity features in an isothermal H I disk to observed H I data. The velocity field of the gas is modeled with a power law for basic circular rotation, underlying noncircular motions from a two-armed density wave pattern. With a reasonable number of adjustable parameters and constraints the model reproduces observations toward many Galactic objects, and accurate distances are found from the modeled velocity field. High-resolution H I spectral line data from the Canadian Galactic Plane Survey (CGPS; Taylor et al.) are used to discriminate clouds from the intercloud medium (the ``stratum'') for which the model is intended. The ability of the model to reproduce these data is demonstrated in one- [Tb(v)] and two- [Tb(l, v)] dimensional fits. Distances to 22 H II regions and SNRs calculated by the fitted velocity field compare extremely well with other kinematically independent distances.
Foster Tyler
MacWilliams Jason
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