Can rotation curves reveal the opacity of spiral galaxies?

Details Can rotation curves reveal the opacity of spiral galaxies? Can rotation curves reveal the opacity of spiral galaxies?

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...440...67m&link_type=abstract

Astronomy and Astrophysics, Volume 440, Issue 1, September II 2005, pp.67-71

Astronomy and Astrophysics

Astrophysics

1

Dust, Extinction, Galaxies: Kinematics And Dynamics, Galaxies: Spiral

Scientific paper

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 τ=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 τ=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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