Mathematics – Logic
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.203v&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
Mathematics
Logic
Agn Evolution
Scientific paper
Elliptical galaxies with powerful radio sources frequently occupy the central regions of galaxy groups and clusters. The interactions of these radio sources with the hot X-ray emitting gas, visible through cavities and edges often spatially correlated with radio emission, form part of the motivation for the growing acceptance of AGN feedback as a principal mechanism for the regulation of cooling flows. Galaxy groups, the principal reservoir of baryons in the present Universe, are -- with their shallow potentials that easily reveal disturbances, frequent galaxy interactions and mergers, and highly diverse structures -- an excellent target for studies aimed at a better understanding of the feedback process, the mechanisms and timescales of energy injection, and the effects on galaxy and group evolution. We survey the scope and results of a study of 18 X-ray bright, elliptical-dominated galaxy groups, for which we have combined deep archival Chandra and XMM-Newton X-ray data with radio continuum imaging of high quality at multiple low frequencies from the GMRT. This combination of data reveals the morphological properties and histories of these sources and the highly diverse types of AGN/hot gas interaction, including the feedback heating by jet-inflated cavities that is common in clusters, but also exhibiting contributions from non-central galaxies, sources in which mixing of X-ray and radio plasma may be important, and cases where AGN-driven gas motions may help distribute heat through the group core. These examples demonstrate the worth of groups as a laboratory for feedback studies, and the insights to be gained from a combined radio/X-ray approach, with the X-ray data showing the geometry, physical state, and energetics of the hot gas and the radio data providing the loci of energy injection and the history of AGN outbursts through the spectral aging of electron populations.
David Liana
Forman William
Giacintucci Simona
Jones Christine
O'Sullivan Ewan
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