Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..556v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 556-572.
Astronomy and Astrophysics
Astrophysics
99
Disk Galaxies, Galactic Structure, Spiral Galaxies, Star Distribution, Stellar Motions, Astronomical Spectroscopy, Gravitational Collapse, Mass Distribution, Mass To Light Ratios, Milky Way Galaxy, Radial Velocity, Systems Stability
Scientific paper
The authors have observed the velocity dispersion of the old disk population in two spiral galaxies. In the face-on Sc spiral NGC 5247, the radial decline of the vertical velocity dispersion >VZ2<1/2 from the center to about two disk scale lengths is consistent with that predicted for a disk of constant thickness and M/L ratio. Combined with earlier results, the (M/L)B value for the old disk is 6±2 solar units. For the edge-on Sb spiral NGC 7184, the authors have measured the asymmetric drift and the absorption line profile widths, which show that the radial velocity dispersion >VR2<1/2 also decreases with radius. In the inner regions, the velocity dispersion contributes significantly to the global disk stability. The observational results are compared with various theoretical stability parameters and numerical simulations of model galaxies.
Freeman Ken C.
van der Kruit Pieter Corijnus
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