Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.108g&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Galaxies
Scientific paper
We will present the results of the combined X-ray/radio analysis of the group/poor cluster of galaxies AWM4, using a new 80 ksec Chandra observation and low frequency GMRT radio data, taken as part of a larger project of an in-depth study of the AGN feedback in the group environment. Previous XMM-Newton observations showed AWM4 to be isothermal, with its powerful central radio galaxy the most likely source of heating. However, with only small lobes detected at 1.4GHz and with no indications of cavities or shocks associated with the AGN, the question of the coupling between jets and intra-group gas remained unresolved. Deep, low frequency GMRT radio observations have revealed the full extent of the radio jets and lobes and allowed us to determine their age, orientation, energy and physical parameters. Our new Chandra data reveals the small-scale galactic corona fueling the AGN and explains why this long, energetic outburst has not quenched cooling in the core. While some weak X-ray features associated with the jets and lobes are detected, we do not detect the clear cavities seen in many other similar systems, bringing us back to the question of the nature of the interaction between the jets and the IGM. We discuss possible interpretations, including entrainment or mixing of thermal gas into the jets and lobes, contributions from non-thermal emission, and dynamical motions of the BCG within the group. AWM4 provides a strong example of the benefits of a combined X-ray/multi-band radio approach to the study of AGN feedback, and emphasizes the power of Chandra's superb spatial resolution to search for the small-scale features which are key to our understanding of the mechanisms of this process.
David Liana
Giacintucci Simona
Mazzotta Pasquale
O'Sullivan Ewan
Raychaudhury Somak
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