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Amplitude of Spiral Arms and Dark Matter

Published online by Cambridge University Press:  26 May 2016

P. Grosbøl
P. Grosbøl*
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany

Abstract

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Relative amplitudes and pitch angles for the main two-armed spiral structure in a sample of 54 non-barred spiral galaxies were estimated from K band photometry. A lack of strong, tight patterns was observed which may be caused by non-linear dynamic effects. Assuming that the upper envelope corresponds to a relative radial forcing of ⋐5%, one can estimate the perturbation of the total potential. This suggests that a maximum disk solution is adequate to account for the force perturbation and that no additional dark matter is required.

Type
Part 9: Disks
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 313 - 314
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Cox, D. P. & Gómez, G. C. 2002, ApJS, 142, 261.Google Scholar
Grosbøl, P. 1993, PASP, 105, 651.Google Scholar
Grosbøl, P., Patsis, P. A., & Pompei, E. 2003, A&A, in preparation.Google Scholar