Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..648j&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Sept. 1990, p. 648-662. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
102
Galactic Structure, Radio Astronomy, Spiral Galaxies, Astronomical Models, Astronomical Photometry, Galactic Rotation, Luminosity, Mass To Light Ratios, Spatial Distribution
Scientific paper
Optical and radio observations of the Magellanic-type spiral galaxy NGC 3109 were carried out to obtain data on the kinematics and distribution of H I. I-band photometry, performed in order to determine the distribution of the old stellar disk population, more representative of the true mass distribution of the disk, is compared with the B-band photometry. H I spectral line imaging shows that the total neutral hydrogen content is 4.9 + or - 1.0 x 10 to the 8th solar masses; the systematic velocity is 406 + or - 2 km/s. The contribution from the dark component is found to dominate at nearly all radii, indicating a breakdown of the 'disk-halo conspiracy' towards the low end of the luminosity function.
Carignan Claude
Jobin Marc
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