Dark-to-luminous mass ratio in spiral galaxies

Details Dark-to-luminous mass ratio in spiral galaxies Dark-to-luminous mass ratio in spiral galaxies

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255...63j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 63-68.

Astronomy and Astrophysics

Astrophysics

26

Galactic Evolution, Galactic Halos, Mass Distribution, Mass To Light Ratios, Spiral Galaxies, Astronomical Models, Dark Matter, Galactic Bulge, Metallicity

Scientific paper

We have calculated the mass-to-light ratios of spiral galaxies in the blue band and the H-band by using a chemical and photometric evolution model with a two-component bulge-disc system. The slopes of the theoretical M/L(b) vs. (B-V) and M/L(h) vs. (B-H) relations are much smaller than those of Larson and Tinsley (1978), which were adopted in previous studies. The model predictions agree with the data of Rubin et al. (1982, 1985) and Burstein et al. (1982); the masses referred to are those within a radius corresponding to the isophotal level of surface brightness at 25th B mag/sq arcsec. We find no evidence which supports the previous claims that bluer galaxies have relatively more massive dark halos. We conclude that the ratio of dark-to-luminous mass is uniform among spiral galaxies, contrary to the conventional view.

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