EAS Publications Series
Volume 20, 2006Mass Profiles and Shapes of Cosmological Structures
|Page(s)||279 - 280|
|Published online||19 May 2006|
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 279-280
The dwarf Galaxy DDO 47: Testing Cusps Hiding in Triaxial Halos
SISSA, Via Beirut 2, 34014 Trieste, Italy
2 Universitäts-Sternwarte München, Scheinerstr. 1, 81679 München, Germany
3 RAIUB, Auf dem Hügel 71, 53121 Bonn, Germany
4 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
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).
© EAS, EDP Sciences, 2006
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