Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 673, Issue 1, Pages L17-L20Publisher
IOP PUBLISHING LTD
DOI: 10.1086/527472
Keywords
cooling flows; galaxies : clusters : general; galaxies : clusters : individual (AWM 4); X-rays : galaxies : clusters
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Funding
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0807724] Funding Source: National Science Foundation
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The core of the relaxed cluster AWM 4 is characterized by a unique combination of properties which defy a popular scenario for AGN 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 (greater than or similar to 3 Gyr) and by the high central entropy level (similar to 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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