Cosmological Effects of Powerful AGN Outbursts in Galaxy Clusters: Insights from anXMM‐NewtonObservation of MS 0735+7421

We report on the results of an analysis of XMM-Newton observations ofMS0735+7421, the galaxy cluster which hosts the most energetic AGN outburstcurrently known. The previous Chandra image shows twin giant X-ray cavities(~200 kpc diameter) filled with radio emission and surrounded by a weak shockfront. XMM data are consistent with these findings. The total energy incavities and shock (~6 \times 10^{61} erg) is enough to quench the cooling flowand, since most of the energy is deposited outside the cooling region (~100kpc), to heat the gas within 1 Mpc by ~1/4 keV per particle. The clusterexhibits an upward departure (factor ~2) from the mean L-T relation. The boostin emissivity produced by the ICM compression in the bright shells due to thecavity expansion may contribute to explain the high luminosity and high centralgas mass fraction that we measure. The scaled temperature and metallicityprofiles are in general agreement with those observed in relaxed clusters.Also, the quantities we measure are consistent with the observed M-T relation.We conclude that violent outbursts such as the one in MS0735+7421 do not causedramatic instantaneous departures from cluster scaling relations (other thanthe L-T relation). However, if they are relatively common they may play a rolein creating the global cluster properties.Comment: 69 pages, 30 figures, accepted for publication in ApJ Main Journa