منابع مشابه
Gamma Rays from Clusters of Galaxies
Clusters of galaxies and the large scale filaments that connect neighboring clusters are expected to be sites of acceleration of charged particles and sources of non-thermal radiation from radio frequencies to gamma rays. Gamma rays are particularly interesting targets of investigation, since they may provide precious information on the nature and efficiency of the processes of acceleration and...
متن کاملGamma Rays from Clusters of Galaxies
The non thermal radiation observed from a handful of clusters of galaxies (CG) is the proof that particle acceleration occurs in the intra cluster medium (ICM). It is often believed that shock surfaces associated with either mergers of CG, or with the cosmological inflow of matter onto clusters during structure formation may be the sites for acceleration. We discuss here the effectiveness of sh...
متن کاملX-rays from Clusters of Galaxies
The X-ray emission from clusters of galaxies enables them to be used as good cosmological probes and as an example for massive galaxy formation. The gas mass fraction in clusters should be a universal standard which by means of Chandra observations enables Ωm to be determined to better than 15 per cent accuracy. Future observations of its apparent variation with redshift will enable ΩΛ to be me...
متن کاملDiffuse Gamma-rays from Local Group Galaxies
Diffuse γ-ray radiation in galaxies is produced by cosmic ray interactions with the interstellar medium. With the completion of EGRET observations, the only extragalactic object from which there has been a positive detection of diffuse γ-ray emission is the Large Magellanic Cloud. We systematically estimate the expected diffuse γ-ray flux from Local Group galaxies, and determine their detectabi...
متن کاملHigh energy gamma-rays from Globular Clusters
It is expected that specific globular clusters can contain up to a hundred of millisecond pulsars. These pulsars can accelerate leptons at the shock waves originated in collisions of the pulsar winds and/or inside the pulsar magnetospheres. Energetic leptons diffuse gradually through the globular cluster comptonizing stellar and microwave background radiation. We calculate the GeV-TeV γ-ray spe...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics A
سال: 2007
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x0703529x