Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256...19b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 19-32.
Astronomy and Astrophysics
Astrophysics
70
Dwarf Galaxies, Galactic Mass, Mass Distribution, Radial Velocity, Spiral Galaxies, Dark Matter, Galactic Structure, H Lines
Scientific paper
Optical and 21-cm neutral hydrogen observations of the dwarf spiral galaxy NGC 1560 are presented. The optical images show that the disk of the galaxy is regular and has an almost perfect exponential behavior with a scale length of 1.30 kpc. The results of Westerbork radio observations show that the galaxy is gas-rich with a H I mass-to-blue luminosity ratio of 2.4. The mass distribution of the galaxy was investigated using several mass models consisting of two observable disk components (gas and stars) and a dark (halo) component. It was found that the global mass-to-light ratio is 11 at R25, increasing up to 35 at the last point of the rotation curve. In the maximum disk model, the ratio between the amount of dark and observable matter increases from 1 at R25 to about 4 at the H I edge of NGC 1560. The stellar mass is about equal to the mass of the gas disk.
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