Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..392s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 2, p. 392-400.
Astronomy and Astrophysics
Astronomy
16
Dark Matter, Distance, Hubble Constant, Spiral Galaxies, Angular Velocity, Galactic Mass, Luminosity
Scientific paper
We consider the effect of dark matter on the Tully-Fisher relation for spiral galaxies; a significant fraction of the scatter in this relation could stem from a systematic dependence of the ratio of dark to luminous mass on luminosity. The dynamical effect of the dark matter can be accounted for after a mass decomposition procedure based on photometry and rotation curve data. The contribution to the circular velocity from the luminous disk alone correlates better with luminosity than does the total velocity, which contains an additional contribution from the dark halo. This correlation is closer to a linear law, has less scatter, and is subject to fewer biases than the conventional Tully-Fisher relation. As an illustration, we use two different sets of distance moduli for a sample of local galaxies to calibrate our relation.
Frenk Carlos S.
Persic Massimo
Salucci Paolo
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