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The dwarf Galaxy DDO 47: Testing Cusps Hiding in Triaxial Halos

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort ,
G. Gentile ,
A. Burkert ,
P. Salucci ,
U. Klein  and
F. Walter
G. Gentile
Affiliation:
SISSA, Via Beirut 2, 34014 Trieste, Italy
A. Burkert
Affiliation:
Universitäts-Sternwarte München, Scheinerstr. 1, 81679 München, Germany
P. Salucci
Affiliation:
SISSA, Via Beirut 2, 34014 Trieste, Italy
U. Klein
Affiliation:
RAIUB, Auf dem Hügel 71, 53121 Bonn, Germany
F. Walter
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
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Abstract

We present HI data of the dwarf galaxy DDO 47, aimed at testing the hypothesis that dark halo triaxiality might induce non-circular motions resulting in rotation curves best fitted by cored halos, even if the dark matter halo is intrinsically cuspy. We performed a harmonic decomposition of the velocity field in order to search for alleged non-circular motions needed to “hide” a cusp: in DDO 47 non-circular motions are globally at a level of 2–3 km s-1, far from being sufficient to reconcile the observed rotation curve with the ΛCDM predictions. We conclude that the dark matter halo around DDO 47 is truly cored and that a cusp cannot be hidden by non-circular motions. More details are shown in Gentile et al. (2005).

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 279 - 280
Copyright
© EAS, EDP Sciences, 2006

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