Volume 471, Number 1, August III 2007
|Page(s)||51 - 57|
|Section||Cosmology (including clusters of galaxies)|
|Published online||25 May 2007|
Constraints on the parameters of radiatively decaying dark matter from the dark matter halos of the Milky Way and Ursa Minor
CERN, PH-TH, 1211 Geneve 23, Switzerland e-mail: firstname.lastname@example.org
2 École Polytechnique Fédérale de Lausanne, Institute of Theoretical Physics, FSB/ITP/LPPC, BSP 720, 1015 Lausanne, Switzerland
3 Bogolyubov Institute of Theoretical Physics, Kyiv, Ukraine
4 Helsinki University Observatory, Finland e-mail: email@example.com
5 Institut des Hautes Études Scientifiques, 91440 Bures-sur-Yvette, France e-mail: firstname.lastname@example.org
Accepted: 19 April 2007
Aims.We improve the earlier restrictions on parameters of the warm dark matter (DM) in the form of a sterile neutrinos.
Methods.The results were obtained from not observing the DM decay line in the X-ray spectrum of the Milky Way (using the recent XMM-Newton PN blank sky data). We also present a similar constraint coming from the recent XMM-Newton observation of Ursa Minor – dark, X-ray quiet dwarf spheroidal galaxy.
Results.The new Milky way data improve on (by as much as the order of magnitude at masses ~3.5 keV) existing constraints. Although the observation of Ursa Minor has relatively poor statistics, the constraints are comparable to those recently obtained using observations of the Large Magellanic Cloud or M 31. This confirms a recent proposal that dwarf satellites of the MW are very interesting candidates for the DM search and dedicated studies should be made to this purpose.
Key words: Galaxy: halo / galaxies: individual: Ursa Minor / cosmology: dark matter / X-rays: galaxies
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.