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Abstract: The standard cooling flow model has predicted a large amount of cool gas inthe clusters of galaxies. The failure of the Chandra and XXM-Newton telescopesto detect cooling gas below 1-2 keV in clusters of galaxies has suggestedthat some heating process must work to suppress the cooling. The most likelyheating source is the heating by AGNs. There are many heating mechanisms, butwe will adopt the effervescent heating model which is a result of theinteraction of the bubbles inflated by AGN with the intra-cluster mediumICM.Using the FLASH code, we have carried out time dependent simulations toinvestigate the effect of the heating on the suppression of the cooling incooling flow clusters. We have found that the effervescent heating model cannot balance the radiative cooling and it is an artificial model. Furthermore,the effervescent heating is a function of the ICM pressure gradient but thecooling is proportional to the gas density square and square root of the gastemperature.



Autor: Nasser Mohamed Ahmed

Fuente: https://arxiv.org/







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