On the dynamical role of cosmic rays in cooling flows in clusters of galaxies

Details On the dynamical role of cosmic rays in cooling flows in clusters of galaxies On the dynamical role of cosmic rays in cooling flows in clusters of galaxies

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..609b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 609-619.

Astronomy and Astrophysics

Astrophysics

43

Cooling, Cosmic Rays, Galactic Clusters, Intergalactic Media, High Temperature Gases, Radio Emission, Synchrotron Radiation, Virgo Galactic Cluster

Scientific paper

Cosmic rays are generated in galaxies, presumably by supernovae and active galactic nuclei, and are released into the surrounding medium. Theoretical estimates and implications from radio observations suggest that the nuclear component of the cosmic rays may be dynamically important in the intergalactic medium of clusters of galaxies, in particular in compact clusters with cooling flows. The propagation and dynamical role of the cosmic rays in the intracluster gas were studied by means of steady spherically symmetric models. With expected values for the cosmic-ray production rate and the transport coefficients, it is found that the cosmic-ray pressure may be comparable to the thermal gas pressure in the halo region around central galaxies in clusters with cooling flows. This should result in Rayleigh-Taylor instabilities inducing an inhomogeneous structure in the cooling flow region. These inhomogeneities may be an important trigger for subsequent thermal condensation leading to the formation of filaments and star birth regions.

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