Journal
ASTRONOMY & ASTROPHYSICS
Volume 440, Issue 1, Pages 67-71Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041913
Keywords
dust, extinction; galaxies : kinematics and dynamics; galaxies : spiral
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The observed anti-correlation between the inclination and the slope of the innermost part of the rotation curve can be attributed to dust extinction. However, the implied central face-on opacity of tau = 2-4 for the most luminous galaxies is embarrassingly high compared with studies of edge-on galaxies, which yield central face-on opacities equal to at most t = 1 in the optical band. I show that the controversy can be resolved by adopting a model that includes the velocity dispersion of the emitters. Through the use of such a model, I reproduce the correlation between galaxy inclination and the slope of its inner rotation curve without having to resort to excessively high optical depth.
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