Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter annihilation

Details Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter annihilation Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter annihilation

2008-01-04

arxiv.org/abs/0801.0740v2

Phys.Rev.D77:103510,2008

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, matches published version

Scientific paper

10.1103/PhysRevD.77.103510

We investigate a scenario where the recently discovered non-thermal hard X-ray emission from the Ophiuchus cluster originates from inverse Compton scattering of energetic electrons and positrons produced in weakly interacting dark matter pair annihilations. We show that this scenario can account for both the X-ray and the radio emission, provided the average magnetic field is of the order of 0.1 microGauss. We demonstrate that GLAST will conclusively test the dark matter annihilation hypothesis. Depending on the particle dark matter model, GLAST might even detect the monochromatic line produced by dark matter pair annihilation into two photons.

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