Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..117v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 117-127.
Astronomy and Astrophysics
Astrophysics
161
Gas Dynamics, Mass To Light Ratios, Spiral Galaxies, Star Distribution, Astronomical Models, Density Distribution, Mass Distribution, Radial Velocity, Velocity Distribution, Vertical Distribution
Scientific paper
In this paper the vertical distribution of old disk stars is re-examined in view of the deviations from the isothermal sheet approximation at small distances from the plane. The relevant equations describing the z-dependence of the velocity dispersion, gravitational force and distribution of isothermal populations of test particles have been derived and compared to the isothermal and exponential case. From this the corrections to the disk surface densities and mass-to-light ratios which are inferred from observed vertical distributions and velocity dispersions of old disk stars and H I are derived. On this basis the best value for the old disk M/L is derived as 6±2 M_sun;/L_sun;,B. The radial truncation in stellar disks which is observed in edge-on spirals at 4 to 5 exponential scalelengths has also been identified in face-on and moderately inclined disks.
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