SIMBAD references

2005ApJ...625L...9N - Astrophys. J., 625, L9-L12 (2005/May-3)

The powerful outburst in Hercules A.

NULSEN P.E.J., HAMBRICK D.C., McNAMARA B.R., RAFFERTY D., BIRZAN L., WISE M.W. and DAVID L.P.

Abstract (from CDS):

The radio source Hercules A resides at the center of a cooling flow cluster of galaxies at redshift z=0.154. A Chandra X-ray image reveals a shock front in the intracluster medium (ICM) surrounding the radio source, about 160 kpc from the active galactic nucleus (AGN) that hosts it. The shock has a Mach number of 1.65, making it the strongest of the cluster-scale shocks driven by an AGN outburst found so far. The age of the outburst is ≃5.9x107 yr, its energy ∼3x1061 ergs, and its mean power ∼1.6x1046 ergs/s. As for the other large AGN outbursts in cooling flow clusters, this outburst overwhelms radiative losses from the ICM of the Hercules A Cluster by a factor of ∼100. It adds to the case that AGN outbursts are a significant source of preheating for the ICM. Unless the mechanical efficiency of the AGN in Hercules A exceeds 10%, the central black hole must have grown by more than 1.7x108 Mto power this one outburst.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - Galaxies: Clusters: Individual: Name: Hercules A - Galaxies: Intergalactic Medium - X-Rays: Galaxies: Clusters

Status at CDS:  

Simbad objects: 4

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2020.04.09-10:40:00

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