Effervescent heating: constraints from nearby cooling flow clusters observed with xmm-newton

Feb, 2006
11 pages
Published in:
  • Astron.Astrophys. 453 (2006) 423
e-Print:

Citations per year

20062007200820092010140
Abstract: (arXiv)
We have used deprojected radial density and temperature profiles of a sample of 16 nearby CF clusters observed with XMM-Newton to test whether the effervescent heating model can satisfactorily explain the dynamics of CF clusters. For each cluster we derived the required extra heating as a function of cluster-centric distance for various values of the unknown parameters M˙\dot M (mass deposition rate) and fcf_c (conduction efficiency). We fitted the extra heating curve using the AGN effervescent heating function and derived the AGN parameters LL (the time-averaged luminosity) and r0r_0 (the scale radius where the bubbles start rising in the ICM). While we do not find any solution with the effervescent heating model for only one object, we do show that AGN and conduction heating are not cooperating effectively for half of the objects in our sample. For most of the clusters we find that, when a comparison is possible, the derived AGN scale radius r0r_0 and the observed AGN jet extension have the same order of magnitude. The AGN luminosities required to balance radiative losses are substantially lowered if the fact that the AGN deposits energy within a finite volume is taken into account. For the Virgo cluster, we find that the AGN power derived from the effervescent heating model is in good agreement with the observed jet power.
  • X-RAY GALAXIES CLUSTERS
  • GALAXIES ACTIVE