Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio AGN

Details Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio AGN Average Heating Rate of Hot Atmospheres in Distant Clusters by Radio AGN

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944103m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #441.03

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Scientific paper

AGN feedback is long believed to be an essential ingredient of cosmic structure formation to provide the extra energy required to slow the rapid acquisition of materials. In galaxy clusters, the quasar mode of AGN were interpreted as a possible candidate of energy source in the preheating model which suggests that the excess energy is injected at early universe. The radio mode of AGN, on the other hand, were thought to be less powerful, and only be fairly enough to balance the radiation loss of cooling core clusters. In this work, we examine atmospheric heating by radio AGN in distant X-ray clusters by cross correlating clusters selected from a composition of eight X-ray cluster surveys with radio sources in the NRAO VLA Sky Survey. The AGN heating for each radio source is determined using scaling relations between radio power and cavity (mechanical) power determined for nearby clusters, groups, and galaxies with hot atmospheres containing X-ray cavities. We find that the continuous heating from the radio AGN could reach more than 1keV per particle in the less massive clusters. This suggests that the contribution of the radio mode AGN is undervalued. In fact, the radio AGN alone could provide enough energy/entropy to explain the deviation of the scaling relations expected from self-similarity, and the preheating may not be necessary.

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