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Phys. Rev. Lett. 99, 131301 (2007) [4 pages]

Searching for Decaying Axionlike Dark Matter from Clusters of Galaxies

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Signe Riemer-Sørensen1,*, Konstantin Zioutas2, Steen H. Hansen1, Kristian Pedersen1, Håkon Dahle1,3, and Anastasios Liolios4
1Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
2Department of Physics, University of Patras, Patras, Greece and CERN, Geneva, Switzerland
3Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, N-0315 Oslo, Norway
4Physics Department, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece

Received 13 March 2007; revised 10 August 2007; published 28 September 2007

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 τ≳1023  sec.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.131301
DOI:
10.1103/PhysRevLett.99.131301
PACS:
95.35.+d, 14.80.Mz, 95.85.Nv, 98.65.Cw

*signe@dark-cosmology.dk

 
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