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Dust and the observed dark matter content of galaxies

Baes, M., Dejonghe, H. and Davies, Jonathan Ivor 2004. Dust and the observed dark matter content of galaxies. Presented at: 220th Symposium of the International Astronomical Union, Sydney, Australia, 21-25 July 2003. Published in: Ryder, S. D., Pisano, D. J., Walker, M. A. and Freeman, K. C. eds. Dark Matter in Galaxies. Proceedings of the International Astronomical Union Symposium (S-220) San Francisco, CA: Astronomical Society of the Pacific, pp. 343-344.

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Using detailed Monte Carlo radiative transfer modeling, we examine the effects of absorption and scattering by interstellar dust on the observed kinematics of galaxies. Our modeling results have a direct impact on the derivation of the properties of dark matter haloes around both elliptical and spiral galaxies. We find that interstellar dust has a very significant effect on the observed stellar kinematics of elliptical galaxies, in the way that it mimics the presence of a dark matter halo. Taking dust into account in kinematical modeling procedures can reduce or even eliminate the need for dark matter at a few effective radii. Dust profoundly affects the optical rotation curve and stellar kinematics of edge-on disc galaxies. This effect, however, is significantly reduced when the galaxy is more than a few degrees from strictly edge-on. These results demonstrate that dust attenuation cannot be invoked as a possible mechanism to reconcile the discrepancies between the observed shallow slopes of LSB galaxy rotation curves and the dark matter cusps found in CDM cosmological simulations.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Astronomical Society of the Pacific
ISBN: 1583811672
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Last Modified: 04 Jun 2017 04:19

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