Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..361g&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 361-365. Research supported by the Consejo Nacional de Ciencia y Tec
Astronomy and Astrophysics
Astrophysics
11
Galactic Rotation, Mass To Light Ratios, Spiral Galaxies, Astronomical Spectroscopy, Density Distribution, Galactic Structure, Mass Distribution, Radii, Velocity Distribution
Scientific paper
We present a dynamical study of the bright spiral galaxies NGC 1068 and NGC 3310. Our purpose is to extend our knowledge of the rotation curves for these systems to radii as large as 10 kpc from the center in the light of the suggestion that galaxies might be surrounded by massive halos with high M/L ratios. From our curves no outer decrease in the velocity is evident, but a slight increase of the velocity is found, yielding a mass around a few tens of billions of solar masses for the galaxies. The inner M/L ratios within 7 kpc are quite low, with maximum values between five and seven solar masses/solar luminosities. The presence of a significant quantity of matter in the external parts of these galaxies, indicated by the observed velocity trends, cannot yet be interpreted as halos as massive as those required in dynamical models, at least within the radii explored.
Galletta Giuseppe
Recillas-Cruz Else
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