title: Searching for decaying axionlike dark matter from clusters of galaxies.
abstract: We constrain the lifetime of radiatively decaying dark matter in clusters of galaxies inspired by generic Kaluza-Klein axions, which have been invoked as a possible explanation for the solar coronal x-ray emission. These particles can be produced inside stars and remain confined by the gravitational potential of clusters. By analyzing x-ray observations of merging clusters, where gravitational lensing observations have identified massive, baryon poor structures, we derive the first cosmological lifetime constraint on this kind of particles of tau > or = 10(23) sec.
authors.affiliation: Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark. signe@dark-cosmology.dk
authors.forename: Signe
authors.initials: S
authors.lastname: Riemer-Sørensen
authors.forename: Konstantin
authors.initials: K
authors.lastname: Zioutas
authors.forename: Steen H
authors.initials: SH
authors.lastname: Hansen
authors.forename: Kristian
authors.initials: K
authors.lastname: Pedersen
authors.forename: Håkon
authors.initials: H
authors.lastname: Dahle
authors.forename: Anastasios
authors.initials: A
authors.lastname: Liolios