Trouble for AGN Feedback ? The puzzle of the core of the Galaxy Cluster AWM 4

Details Trouble for AGN Feedback ? The puzzle of the core of the Galaxy Cluster AWM 4 Trouble for AGN Feedback ? The puzzle of the core of the Galaxy Cluster AWM 4

2007-12-05

arxiv.org/abs/0712.0783v1

Astrophys.J. 673 (2008) L17-L20

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures (2 in colour), accepted for publication in ApJ Letters

Scientific paper

10.1086/527472

The core of the relaxed cluster AWM 4 is characterized by a unique combination of properties which defy a popular scenario for ANG heating of cluster cores. A flat inner temperature profile is indicative of a past, major heating episode which completely erased the cool core, as testified by the high central cooling time (~ 3 Gyr) and by the high central entropy level (~ 60 keV cm^2). Yet the presence of a 1.4 GHz active central radio galaxy with extended radio lobes out to 100 kpc, reveals recent feeding of the central massive black hole. A system like AWM 4 should have no radio emission at all if only feedback from the cooling hot gas regulates the AGN activity.

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