Constraints on parameters of radiatively decaying dark matter from the galaxy cluster 1E0657-56

Details Constraints on parameters of radiatively decaying dark matter from the galaxy cluster 1E0657-56 Constraints on parameters of radiatively decaying dark matter from the galaxy cluster 1E0657-56

2006-11-06

arxiv.org/abs/astro-ph/0611168v1

Astrophys.J.673:752-757,2008

Astronomy and Astrophysics

Astrophysics

6pp

Scientific paper

10.1086/524397

We derived constraints on parameters of a radiatively decaying warm dark matter particle, e.g., the mass and mixing angle for a sterile neutrino, using Chandra X-ray spectra of a galaxy cluster 1E0657-56 (the ``bullet'' cluster). The constraints are based on nondetection of the sterile neutrino decay emission line. This cluster exhibits spatial separation between the hot intergalactic gas and the dark matter, helping to disentangle their X-ray signals. It also has a very long X-ray observation and a total mass measured via gravitational lensing. This makes the resulting constraints on sterile neutrino complementary to earlier results that used different cluster mass estimates. Our limits are comparable to the best existing constraints.

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