The insignificance of global reheating in the Abell 1068 cluster: Multiwavelength analysis

We present a detailed, multiwavelength study of the Abell 1068 galaxy cluster, and we use this data to test cooling and energy feedback models of galaxy clusters. Near ultraviolet and infrared images of the cluster show that the cD galaxy is experiencing star formation at a rate of ~20-70 M_o/yr over the past ~100 Myr. The dusty starburst is concentrated toward the nucleus of the cD galaxy and in filamentary structures projecting 60 kpc into its halo. The Chandra X-ray image presented in WMM reveals a steep temperature gradient that drops from roughly 4.8 keV beyond 120 kpc to roughly 2.3 keV in the inner 10 kpc of the galaxy where the starburst peaks. Over 95% of the ultraviolet and Halpha photons associated with the starburst are emerging from regions cloaked in keV gas with very short cooling times ~100 Myr, as would be expected from star formation fueled by cooling condensations in the intracluster medium. The local cooling rate in the vicinity of the central starburst is < 40 M_o/yr, which is consistent with the star formation rate determined with U-band and infrared data. We find that energy feedback from both the radio source and thermal conduction are inconsequential in Abell 1068. Although supernova explosions associated with the starburst may be able to retard by ~18% or so, they are incapable of maintaining the cooling gas at keV temperatures.

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