Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-28
Mon.Not.Roy.Astron.Soc. 343 (2003) 1081
Astronomy and Astrophysics
Astrophysics
14 pages, 6 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06770.x
We present SKIRT (Stellar Kinematics Including Radiative Transfer), a new Monte Carlo radiative transfer code that allows the calculation of the observed stellar kinematics of a dusty galaxy. The code incorporates the effects of both absorption and scattering by interstellar dust grains, and calculates the Doppler shift of the emerging radiation exactly by taking into account the velocities of the emitting stars and the individual scattering dust grains. The code supports arbitrary distributions of dust through a cellular approach, whereby the integration through the dust is optimized by means of a novel efficient trilinear interpolation technique. We apply our modelling technique to calculate the observed kinematics of realistic models for dusty disc galaxies. We find that the effects of dust on the mean projected velocity and projected velocity dispersion are severe for edge-on galaxies. For galaxies which deviate more than a few degrees from exactly edge-on, the effects are already strongly reduced. As a consequence, dust attenuation cannot serve as a possible way to reconcile the discrepancy between the observed shallow slopes of the inner rotation curves of LSB galaxies and the predictions of CDM cosmological models. For face-on galaxies, the velocity dispersion increases with increasing dust mass due to scattering, but the effects are limited, even for extended dust distributions. Finally, we show that serious errors can be made when the individual velocities of the dust grains are neglected in the calculations.
Baes Maarten
Davies Jonathan I.
de Blok J. G. W.
Dejonghe Herwig
Evans Rhodri
No associations
LandOfFree
Radiative transfer in disc galaxies -- III. The observed kinematics of dusty disc galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radiative transfer in disc galaxies -- III. The observed kinematics of dusty disc galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiative transfer in disc galaxies -- III. The observed kinematics of dusty disc galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-44738