| Issue |
EAS Publications Series
Volume 20, 2006
Mass Profiles and Shapes of Cosmological Structures
|
|
|---|---|---|
| Page(s) | 279 - 280 | |
| DOI | https://doi.org/10.1051/eas:2006089 | |
| 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
1
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