期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 422, 期 3, 页码 2213-2229出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.20764.x
关键词
galaxies: active; galaxies: clusters: intracluster medium; galaxies: elliptical and lenticular, cD
资金
- Science and Technology Facilities Council [ST/F002858/1, ST/I000976/1]
- Swedish Research Council (VR) through the Oskar Klein Centre
- Fundacao para a Ciencia e a Tecnologia [PTDC/CTE-AST/64711/2006]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- University of Cambridge
- University of Florida
- French Participation Group
- German Participation Group
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- Science and Technology Facilities Council [ST/I000976/1, ST/H001581/1, ST/I001573/1, ST/J001562/1, 1093560, ST/J50077X/1, ST/H002391/1, ST/J001465/1, ST/J004650/1, ST/F002858/1, ST/F006977/1, PP/E001149/1] Funding Source: researchfish
- Fundação para a Ciência e a Tecnologia [PTDC/CTE-AST/64711/2006] Funding Source: FCT
- STFC [ST/J001465/1, ST/H001581/1, ST/I004459/1, ST/I000976/1, ST/J001562/1, ST/F006977/1, ST/J004650/1, ST/I004459/2, ST/F002858/1, ST/G00692X/1, ST/J50077X/1, ST/I001573/1, PP/E001149/1, ST/H002391/1] Funding Source: UKRI
Using a sample of 123 X-ray clusters and groups drawn from the XMM Cluster Survey first data release, we investigate the interplay between the brightest cluster galaxy (BCG), its black hole and the intracluster/group medium (ICM). It appears that for groups and clusters with a BCG likely to host significant active galactic nuclei (AGN) feedback, gas cooling dominates in those with TX > 2 keV while AGN feedback dominates below. This may be understood through the subunity exponent found in the scaling relation we derive between the BCG mass and cluster mass over the halo mass range 1013 < M500 < 1015 M? and the lack of correlation between radio luminosity and cluster mass, such that BCG AGN in groups can have relatively more energetic influence on the ICM. The LXTX relation for systems with the most massive BCGs, or those with BCGs co-located with the peak of the ICM emission, is steeper than that for those with the least massive and most offset, which instead follows self-similarity. This is evidence that a combination of central gas cooling and powerful, well fuelled AGN causes the departure of the ICM from pure gravitational heating, with the steepened relation crossing self-similarity at TX= 2 keV. Importantly, regardless of their black hole mass, BCGs are more likely to host radio-loud AGN if they are in a massive cluster (TX? 2 keV) and again co-located with an effective fuel supply of dense, cooling gas. This demonstrates that the most massive black holes appear to know more about their host cluster than they do about their host galaxy. The results lead us to propose a physically motivated, empirical definition of cluster and group, delineated at 2 keV.
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