Searching for decaying axionlike dark matter from clusters of galaxies.
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.
Riemer-Sørensen
Signe
S
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark. signe@dark-cosmology.dk
Zioutas
Konstantin
K
Hansen
Steen H
SH
Pedersen
Kristian
K
Dahle
Håkon
H
Liolios
Anastasios
A