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Cosmic-ray heating of cooling flows - A critical analysis
Loewenstein, Michael; Zweibel, Ellen G.; Begelman, Mitchell C.
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Colorado, University; Joint Institute for Laboratory Astrophysics, Boulder), AC(Colorado, University; Joint Institute for Laboratory Astrophysics, Boulder)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 392-402. Research supported by Alfred P. Sloan Foundation. (ApJ Homepage)
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NASA/STI Keywords:
Cooling Flows (Astrophysics), Cosmic Rays, Intergalactic Media, Magnetohydrodynamic Waves, Radiant Heating, Astronomical Models, Diffusion Coefficient, Temperature Distribution, Wave Propagation
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It is shown that a combination of MHD wave-mediated cosmic ray heating and thermal conduction could balance cooling in intracluster media and substantially reduce the rate of inflow. The appropriate system of steady state equations is solved, including a new self-consistent formulation for the cosmic-ray diffusivity. Models which can produce substantial positive temperature gradients in static configurations are found when conduction is reduced by a factor of 10 or more. These models have too-flat thermal pressure profiles compared with observations. It is found that cosmic-ray heating is unlikely either to stabilize positive density perturbations against condensation or to contribute appreciably to the powering of the optical filaments.

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