Query : 2005A&A...440...67M

2005A&A...440...67M - Astronomy and Astrophysics, volume 440, 67-71 (2005/9-2)

Can rotation curves reveal the opacity of spiral galaxies?


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): dust, extinction - galaxies: kinematics and dynamics - galaxies: spiral

Simbad objects: 2

goto Full paper

goto View the references in ADS

Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1599 2
2 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 672 2

To bookmark this query, right click on this link: simbad:objects in 2005A&A...440...67M and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact