Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..357b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 357-367.
Astronomy and Astrophysics
Astrophysics
16
Galactic Rotation, Galactic Structure, Radial Velocity, Spiral Galaxies, Stellar Motions, Velocity Distribution, Absorption Spectra, Line Spectra, Mass To Light Ratios
Scientific paper
NGC891 is examined by means of observations, and a model galaxy is developed to describe the dispersion and compare the results to the observations and thereby calculate the dispersion definitively. The absorption-line spectra are obtained at three positions to determine the stellar kinematics, and the dispersion values are given as a function of radius inside the galaxy. The galaxy model employed to describe this function includes a disk, a bulge, and an absorbing layer. The results are similar to the dispersion value for the Milky Way: the central dispersion is 120 +/- 20 km/s when the radial velocity dispersion decreases exponentially as a function of radius with a scalelength that is twice the photometric scalelength. This allows the determination of a mass-to-light ratio of between 6 and 10, and the comparison of the model calculations and the observations allows the determination of the dispersion.
Bottema Roelof
Valentijn Edwin. A.
van der Kruit Pieter Corijnus
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