other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2000MNRAS.318..798B - Mon. Not. R. Astron. Soc., 318, 798-808 (2000/November-1)
Kinematics of elliptical galaxies with a diffuse dust component - II. Dust effects on kinematic modelling.
BAES M., DEJONGHE H. and DE RIJCKE S.
Abstract (from CDS):
We find some considerable differences between the best-fitting models and the input models, and we find that these differences are dependent on the orbital structure of the input galaxy. For radial and isotropic models on the one hand, we find that the dynamical mass of the models decreases nearly linearly with optical depth, with an amount of 5per cent per optical depth unit, whereas their orbital structure is hardly affected. For tangential models on the other hand, the dynamical mass decrease is smaller, but their orbital structure is affected: their distribution functions appear less tangentially anisotropic. For all models the mass-to-light ratio will be underestimated, by a factor of around 20per cent per optical depth unit.
We discuss these results in the light of the limited effects of dust extinction on the LOSVDs, as obtained in Paper I, and conclude that the determination of the dynamical mass and the kinematic structure of galaxies is not only determined by the observed kinematic quantities, but is also critically dependent on the potential and hence the observed light profile. We argue that dust, even in rather modest amounts, should therefore be taken into account in kinematic modelling procedures.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): dust, extinction - galaxies: elliptical and lenticular, cD - galaxies: ISM - galaxies: kinematics and dynamics
Simbad objects: 2
To bookmark this query, right click on this link: simbad:2000MNRAS.318..798B and select 'bookmark this link' or equivalent in the popup menu