– 2 – Non - thermal Origin of the EUV and Soft X - rays from the Coma Cluster - Cosmic Rays in Equipartition with the Thermal Medium
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Estimating galaxy cluster magnetic fields by the classical and hadronic minimum energy criterion
We wish to estimate magnetic field strengths of radio emitting galaxy clusters by minimising the non-thermal energy density contained in cosmic ray electrons (CRe), protons (CRp), and magnetic fields. The classical minimum energy estimate can be constructed independently of the origin of the radio synchrotron emitting CRe yielding thus an absolute minimum of the non-thermal energy density. Prov...
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WMAP’s detection of the Sunyaev-Zel’dovich effect (SZE) at a much reduced level among several large samples of rich clusters is interpreted in terms of conventional physics. It is by now widely believed that the central soft X-ray and EUV excess found in some clusters cannot be of thermal origin, due to problems with rapid gas cooling and the persistent non-detection of the O VII line, but may ...
متن کاملOn the equipartition of thermal and non-thermal energy in clusters of galaxies
Clusters of galaxies are revealing themselves as powerful sources of non thermal radiation in a wide range of wavelengths. In order to account for these multifrequency observations equipartition of cosmic rays (CRs) with the thermal gas in clusters of galaxies is often invoked. This condition might suggest a dynamical role played by cosmic rays in the virialization of these large scale structur...
متن کاملCosmic Rays, Radio Halos and Non-Thermal X-ray Emission in Clusters of Galaxies
We calculate the flux of radio, hard X-ray and UV radiation from clusters of galaxies as produced by synchrotron emission and Inverse Compton Scattering of electrons generated as secondaries in cosmic ray interactions in the intracluster medium. Both the spatial distribution of cosmic rays due to their diffusion and the spatial distribution of the intracluster gas are taken into account. Our ca...
متن کاملExtreme Ultraviolet Emission from Clusters of Galaxies: Inverse Compton Radiation from a Relic Population of Cosmic Ray Electrons?
We suggest that the luminous extreme ultraviolet (EUV) emission which has been detected recently from clusters of galaxies is Inverse Compton (IC) scattering of Cosmic Microwave Background (CMB) radiation by low energy cosmic ray electrons in the intracluster medium. The cosmic ray electrons would have Lorentz factors of γ ∼ 300, and would lose energy primarily by emitting EUV radiation. These ...
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تاریخ انتشار 1998