Ghent University Academic Bibliography

Advanced

Radiative transfer in disc galaxies, III : the observed kinematics of dusty disc galaxies

Maarten Baes UGent, Jonathan I Davies, Herwig Dejonghe UGent, Sabina Sabatini, Sarah Roberts, Rhodri Evans, Suzanne M Linder, Rodney M Smith and WJG de Blok (2003) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 343(4). p.1081-1094
abstract
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 low surface brightness galaxies and the predictions of cold dark matter cosmological models. For face-on galaxies, the velocity dispersion increases with increasing dust mass owing 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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
radiative transfer, dust, extinction, galaxies : kinematics and dynamics, galaxies : spiral, SURFACE BRIGHTNESS GALAXIES, RESOLUTION ROTATION CURVES, MONTE-CARLO SIMULATIONS, STAR-FORMING GALAXIES, DARK-MATTER HALOS, SPIRAL GALAXIES, ELLIPTIC GALAXIES, COLOR GRADIENTS, MULTIPLE-SCATTERING, REFLECTION NEBULAE
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
343
issue
4
pages
1081-1094 pages
Web of Science type
Article
Web of Science id
000184665600006
JCR category
ASTRONOMY & ASTROPHYSICS
JCR impact factor
4.993 (2003)
JCR rank
5/42 (2003)
JCR quartile
1 (2003)
ISSN
0035-8711
DOI
10.1046/j.1365-8711.2003.06770.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
208300
handle
http://hdl.handle.net/1854/LU-208300
date created
2008-01-11 10:41:00
date last changed
2017-02-28 14:10:27
@article{208300,
  abstract     = {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 low surface brightness galaxies and the predictions of cold dark matter cosmological models. For face-on galaxies, the velocity dispersion increases with increasing dust mass owing 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.},
  author       = {Baes, Maarten and Davies, Jonathan I and Dejonghe, Herwig and Sabatini, Sabina and Roberts, Sarah and Evans, Rhodri and Linder, Suzanne M and Smith, Rodney M and de Blok, WJG},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {radiative transfer,dust,extinction,galaxies : kinematics and dynamics,galaxies : spiral,SURFACE BRIGHTNESS GALAXIES,RESOLUTION ROTATION CURVES,MONTE-CARLO SIMULATIONS,STAR-FORMING GALAXIES,DARK-MATTER HALOS,SPIRAL GALAXIES,ELLIPTIC GALAXIES,COLOR GRADIENTS,MULTIPLE-SCATTERING,REFLECTION NEBULAE},
  language     = {eng},
  number       = {4},
  pages        = {1081--1094},
  title        = {Radiative transfer in disc galaxies, III : the observed kinematics of dusty disc galaxies},
  url          = {http://dx.doi.org/10.1046/j.1365-8711.2003.06770.x},
  volume       = {343},
  year         = {2003},
}

Chicago
Baes, Maarten, Jonathan I Davies, Herwig Dejonghe, Sabina Sabatini, Sarah Roberts, Rhodri Evans, Suzanne M Linder, Rodney M Smith, and WJG de Blok. 2003. “Radiative Transfer in Disc Galaxies, III : the Observed Kinematics of Dusty Disc Galaxies.” Monthly Notices of the Royal Astronomical Society 343 (4): 1081–1094.
APA
Baes, M., Davies, J. I., Dejonghe, H., Sabatini, S., Roberts, S., Evans, R., Linder, S. M., et al. (2003). Radiative transfer in disc galaxies, III : the observed kinematics of dusty disc galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 343(4), 1081–1094.
Vancouver
1.
Baes M, Davies JI, Dejonghe H, Sabatini S, Roberts S, Evans R, et al. Radiative transfer in disc galaxies, III : the observed kinematics of dusty disc galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2003;343(4):1081–94.
MLA
Baes, Maarten, Jonathan I Davies, Herwig Dejonghe, et al. “Radiative Transfer in Disc Galaxies, III : the Observed Kinematics of Dusty Disc Galaxies.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 343.4 (2003): 1081–1094. Print.