An Approach Based on Plasma Kinetic Theory to the X-ray and Radio Connection in Clusters of Galaxies

Details An Approach Based on Plasma Kinetic Theory to the X-ray and Radio Connection in Clusters of Galaxies An Approach Based on Plasma Kinetic Theory to the X-ray and Radio Connection in Clusters of Galaxies

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xrrc.proce8.14o&link_type=abstract

"X-Ray and Radio Connections (eds. L.O. Sjouwerman and K.K Dyer) Published electronically by NRAO, http://www.aoc.nrao.edu/event

Computer Science

X-Ray, Radio, Cluster Mergers

Scientific paper

We show that magnetic fields are spontaneously generated in plasmas with temperature gradients. This mechanism is the same as the Weibel instability because the velocity distribution function is non-equilibrium and anisotropic for heat flows. The growth of the instability is saturated by the wave-particle interaction. After the saturation, the generated small-scale magnetic fields evolve into larger-scale fields via inverse-cascade. This mechanism is a new possibility of the origin of magnetic fields in various space plasma. We apply this mechanism to clusters of galaxies. This mechanism can explain observational aspects of cluster radio halos. In addition, we find the inverse-Compton scattering of the cosmic microwave background (CMB) radiation with electrons occurs because of anisotropic velocity distribution function induced by temperature inhomogeneities. A new type of the spectrum distortion of the CMB was found and named as gradient T Sunyaev-Zel'dovich effect (gradT SZE). The result provides a direct method for measuring the heat conductivities and the functional form of the electron momentum distribution functions in the plasma with a temperature gradient.

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