Dark matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775

Details Dark matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775 Dark matter in early-type spiral galaxies: the case of NGC 2179 and of NGC 2775

1998-09-28

arxiv.org/abs/astro-ph/9809366v1

Astronomy and Astrophysics

Astrophysics

17 pages, 15 PostScript figures, aa.cls (using pslatex), accepted for publication in A&A

Scientific paper

We present stellar and ionized-gas velocity curves and velocity dispersion profiles for the Sa galaxies NGC 2179 and NGC 2775. Using their luminosity profiles and modeling both their stellar and gaseous kinematics, we have derived the mass distribution of the dark and the luminous matter. This unambiguously shows that, inside one disk length-scale R_D, the stellar bulge and disk account for the whole gravitating mass. The dark matter halo, likely present also at inner radii, becomes an important mass component only for R > 2 R_D. Giving the quantity and quality of the data, our results on these two luminous galaxies serve as strong counter-example to the recent claim according to which also high-luminosity spirals are dark matter dominated at essentially all radii.

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