Kinematics of elliptical galaxies with a diffuse dust component

Details Kinematics of elliptical galaxies with a diffuse dust component Kinematics of elliptical galaxies with a diffuse dust component

1999-10-15

arxiv.org/abs/astro-ph/9910286v1

2000, MNRAS, 313, 153

Astronomy and Astrophysics

Astrophysics

12 pages, 9 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03207.x

Observations show that early-type galaxies contain a considerable amount of interstellar dust, most of which is believed to exist as a diffusely distributed component. We construct a four-parameter elliptical galaxy model in order to investigate the effects of such a smooth absorbing component on the projection of kinematic quantities, such as the line profiles and their moments. We investigate the dependence on the optical depth and on the dust geometry. Our calculations show that both the amplitude and the morphology of these quantities can be significantly affected. Dust effects should therefore be taken in consideration when interpreting photometric and kinematic properties, and correlations that utilize these quantities.

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