Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242...30d&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 30-52.
Astronomy and Astrophysics
Astrophysics
36
Gas Dynamics, Nebulae, Spiral Galaxies, Velocity Distribution, Astronomical Catalogs, Astronomical Maps, Fabry-Perot Interferometers, H Alpha Line, H Ii Regions, Kinematics
Scientific paper
The velocity field in the SA(s)d spiral NGC 7793 at a distance of 3.1 Mpc in the Sculptor group is derived from 3822 velocities measured on 21 H-alpha interferograms taken with the Galaxymeter attached to the 92 cm and 205 cm reflectors of McDonald Observatory. A catalog of 132 H II regions is presented; the number density of the H II regions decreased roughly exponentially with radial distance in the plane of the galaxy. Isovelocity maps at 12 and 24 arcsec resolution are presented. The masses estimated by fitting the observed rotation curve to various conventional mass distribution models are in the range 8-billion to 16-billion solar units, of which 2-4 percent is in a small spheroidal component.
Davoust Emmanuael
de Vaucouleurs Gerard
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