http://arxiv.org/abs/1802.00454
We study the excess entropy and the corresponding non-gravitational feedback energy ($E_{feedback}$) in the intra-cluster medium (ICM) by considering a sample of 22 galaxy clusters using Chandra X-ray and NRAO VLA Sky Survey (NVSS)/Giant Metrewave Radio Telescope (GMRT) radio observations. We find moderate to strong correlation of the brightest cluster galaxy (BCG) radio luminosity ($L_R$) with the feedback energy and various other cluster thermal properties. We show conclusively that the active galactic nucleus (AGN) is more efficient in transferring feedback energy to the ICM in less massive clusters. In particular, we find that for the sample of 11 clusters with optically confirmed BCGs, BCG radio luminosity scales with feedback energy as $L_R\propto E_{feedback}^{4.52\pm1.84}$ and $E_{feedback}/L_{R} \propto T_{obs}^{-6.0}$ (or $E_{feedback}/L_{R} \propto M_{500}^{-3.36}$). Finally, we discuss the implications of our results with regard to feedback in clusters.
A. Iqbal, R. Kale, B. Nath, et. al.
Mon, 5 Feb 18
48/52
Comments: 6 pages, 5 figures, 1 table, Submitted to MNRAS Letters, Comments welcome
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