Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4..131t&link_type=abstract
Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o
Physics
Scientific paper
The confinement of the Intra-Cluster Cosmic Rays (ICCRs) is investigated with a numerical solver of the diffusion equation. The number density of ICCR particles and the confinement timescale are estimated. The typical values are N = 10013cm03 and ˜ 100Myrs. This indicates that the ICCRs c are now in steady state and they cannot be confined during the Hubble time. The γ-ray flux induced by ICCRs are also estimated. The emission process considered here is pp ! 0 ! 2 . The predicted flux is ˜ 10011 photons/cm2 /s for the Coma and Virgo clusters. Because the upper limit of the γ-ray flux observed by the EGRET is < 4 2 1008 , these clusters cannot be observed by the EGRET. The detection limit of the GLAST is 1009 and it is also difficult to detect the γ-rays by the GLAST. Finally the contribution of the ICCRs to the cosmic γ-ray background is studied. The expected flux over the energy range 30MeV-10GeV (this range is the same as that of the EGRET) is ˜ 5 21007 . This implies that the ICCRs contribution is a few percent to the background.
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