Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..425c&link_type=abstract
Astronomy and Astrophysics, vol. 49, no. 3, June 1976, p. 425-429. In French.
Astronomy and Astrophysics
Astrophysics
4
Galactic Rotation, Mass Distribution, Radial Velocity, Spiral Galaxies, Forbidden Bands, Galactic Nuclei, H Alpha Line, Image Tubes, Stellar Mass, Stellar Spectra
Scientific paper
The mass and rotation of the spiral galaxy NGC 6015 are calculated on the basis of image tube spectra obtained at a dispersion of 35 A/mm in the range 6450-6800 A. The radial velocities obtained for alpha hydrogen and for forbidden N(II) at 6583 A are in good agreement with previously reported results. The rotation curve in a 4-parameter polynomial representation is analyzed to obtain the mass of the galaxy. For the Balkowski (1973) distance of 15.1 Mrc, the calculated mass to a distance of 6570 pc from the nucleus is 28 billion solar masses, with a M/L ratio of 3.2/1. The observed intensity ratio of alpha hydrogen to forbidden N(II) at 6583 A is about 1.8.
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