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Cores vs. Cusps: Dark Matter Density Profiles in Spirals

Published online by Cambridge University Press:  26 May 2016

Gianfranco Gentile ,
Uli Klein ,
Paolo Salucci  and
Daniela Vergani
Gianfranco Gentile
Affiliation:
Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71D, 53121 Bonn, Germany
Uli Klein
Affiliation:
Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71D, 53121 Bonn, Germany
Paolo Salucci
Affiliation:
SISSA/ISAS, via Beirut 4, 34014 Trieste, Italy
Daniela Vergani
Affiliation:
Observatoire de Paris DAEC, and UMR 8631, associé au CNRS et à l'Université Paris 7, 92195 Meudon Cedex, France

Abstract

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We use photometric, Hα and Hi data to investigate the distribution of dark matter in spiral galaxies. A new technique for deriving the Hi rotation curve is presented. the final combined Hα+Hi rotation curves are symmetric, well resolved and extend to large radii. We perform the rotation curve decomposition into the luminous and dark matter contributions. the observations are confronted with different models of the dark matter distribution, including core-dominated and cusp-dominated halos as well as less conventional possibilities. the best agreement with the observations is found for the core-dominated halos.

Type
Part 9: Disks
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 311 - 312
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

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