ACTIVE GALACTIC NUCLEUS FEEDBACK AND ENTROPY INJECTION IN GALAXY CLUSTER CORES

作者：Chaudhuri Anya^*; Majumdar Subhabrata; Nath Biman B

来源：Astrophysical Journal, 2013, 776(2): 84.

DOI：10.1088/0004-637X/776/2/84

• galaxies: clusters: general
• X-rays: galaxies: clusters

We make the first estimate of non-gravitational energy profiles in galaxy cluster cores (and beyond) based on observational data. Comparing the observed entropy profiles within r(500), from the Representative XMM-Newton Cluster Structure Survey to simulated base entropy profiles without feedback from both adaptive mesh refinement (AMR) and smoothed particle hydrodynamic (SPH) non-radiative simulations, we estimate the amount of additional non-gravitational energy, E-ICM, contained in the intracluster medium (ICM), as well as the total energy feedback, E-Feedback, from active galactic nuclei (AGNs; the central AGNs in most cases) into the clusters. The total feedback energy scales with the mean spectroscopic temperature as E-Feedback alpha T-sp(2.52 +/- 0.08) and E-Feedback alpha T-sp(2.17 +/- 0.11) for the SPH and AMR baseline profiles. The mean non-gravitational energy per particle within r(500) remaining in the ICM after energy lost during cooling is epsilon(ICM) = 2.8 +/- 0.8 keV for the SPH theoretical relation and epsilon(ICM) = 1.7 +/- 0.9 keV for the AMR theoretical relation. We use the NRAO/VLA Sky Survey source catalog to determine the radio luminosity, L-R, at 1.4 GHz of the central source(s) of our sample. For T-sp %26gt; 3 keV, the E-Feedback correlates with L-R, although with different normalization for cool-core and non-cool-core clusters. We show that AGNs could provide a significant portion of the feedback.

• 出版日期2013-10-20