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We study the possibility that a large fraction of the gas at temperatures of\~10^7 K in cooling flow clusters cools by heat conduction to lowertemperatures, rather than by radiative cooling. We argue that this process,when incorporated into the so-called "moderate cooling flow model", where theeffective age of the intracluster medium is much lower than the age of thecluster, reduces substantially the expected X-ray luminosity from gas residingat temperatures of <10^7 K. In this model, the radiative mass cooling rate ofgas at ~10^7 K inferred from X-ray observations, which is <20 % of the masscooling rates cited in the past, is easily met. The heat conduction isregulated by reconnection between the magnetic field lines in cold (~10^4 K)clouds and the field lines in the intracluster medium. A narrow conductionfront is formed, which, despite the relatively low temperature, allowsefficient heat conduction from the hot ICM to the cold clouds. The reconnectionbetween the field lines in cold clouds and those in the intracluster mediumoccurs only when the magnetic field in the ICM is strong enough. This occursonly in the very inner regions of cooling flow clusters, at r~10-30 kpc. Thelarge ratio of the number of H\alpha photons to the number of cooling hydrogenatoms is explained by this scenario.

Cooling of X-ray emitting gas by heat conduction in the center of cooling flow clusters