title: Strategy for searching for a dark matter sterile neutrino.
abstract: We propose a strategy for how to look for dark matter particles possessing a radiative decay channel and derive constraints on their parameters from observations of x rays from our own Galaxy and its dwarf satellites. When applied to sterile neutrinos in the keV mass range this approach gives a significant improvement to restrictions on neutrino parameters compared with previous works.
authors.affiliation: CERN/PH-TH, CH-1211 Geneva 23, Switzerland and Ecole Polytechnique Fédérale de Lausanne, CH-1015, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Boyarsky
authors.forename: A
authors.initials: A
authors.lastname: Neronov
authors.forename: O
authors.initials: O
authors.lastname: Ruchayskiy
authors.forename: M
authors.initials: M
authors.lastname: Shaposhnikov
authors.forename: I
authors.initials: I
authors.lastname: Tkachev