Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0911e&link_type=abstract
American Astronomical Society, HEAD meeting #10, #9.11
Astronomy and Astrophysics
Astronomy
Scientific paper
The presence of relativistic electrons in some clusters of galaxies has been established for a long time through the detection of synchrotron emission in the radio domain. However, the inverse-Compton component which is predicted in the hard X-ray domain has been elusive for a long time. The detection of the hard X-ray component is important to measure the typical magnetic field in clusters, to understand the particle acceleration history of clusters, and to constrain the particle acceleration models which lead to the presence of relativistic electrons (primary, secondary electrons, dark matter annihilation, ...).
In this presentation, I will present the results of observations of the Coma, Ophiuchus, Perseus and Virgo clusters of galaxies with the IBIS/ISGRI and JEM-X instruments on board INTEGRAL. I will emphasize on the results obtained from observations of the Ophiuchus cluster, which led to the first statistically significant detection of non-thermal emission from a cluster of galaxies, and on the influence of these results on particle acceleration scenarios.
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