Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981s%26w....20..369w&link_type=abstract
Sterne und Weltraum, vol. 20, Oct. 1981, p. 369-371. In German.
Astronomy and Astrophysics
Astronomy
Galactic Rotation, Line Spectra, Milky Way Galaxy, Nebulae, Radial Velocity, Andromeda Galaxy, Astrometry, Astronomical Models, Emission Spectra, Galactic Mass, Luminous Intensity, Mass, Spectrum Analysis
Scientific paper
The determination of the radial velocities of galaxies is based on the measurement of the displacement of spectral lines from objects in these galaxies. Particularly well suited for these measurements are the emission lines from nebulae. Optical measurements of the considered type are only possible in the case of galaxies located in the vicinity of the Milky Way. To obtain information about more remote galaxies, a procedure based on the measurement of the 21-cm line is employed. Attention is given to methods for determining the galactic mass, taking into account investigations reported by Schmidt (1965). The radius of the Milky Way is estimated to be approximately 50 kpc.
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