A High Fidelity Sample of Cold Front Clusters from the Chandra Archive - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: This paper presents a sample of -cold front- clusters selected from theChandra archive. The clusters are selected based purely on the existence ofsurface brightness edges in their Chandra images which are modeled as densityjumps. A combination of the derived density and temperature jumps across thefronts is used to select nine robust examples of cold front clusters:1ES0657-558, Abell 1201, Abell 1758N, MS1455.0+2232, Abell 2069, Abell 2142,Abell 2163, RXJ1720.1+2638, and Abell 3667. This sample is the subject of anongoing study aimed at relating cold fronts to cluster merger activity, andunderstanding how the merging environment affects the cluster constituents.Here, temperature maps are presented along with the Chandra X-ray images. Adichotomy is found in the sample in that there exists a subsample of cold frontclusters which are clearly mergers based on their X-ray morphologies, and asecond subsample which harbor cold fronts, but have surprisingly relaxed X-raymorphologies, and minimal evidence for merger activity at other wavelengths.For this second subsample, the existence of a cold front provides the soleevidence for merger activity at X-ray wavelengths. We discuss how cold frontscan provide additional information which may be used to constrain mergerhistories, and also the possibility of using cold fronts to distinguish majorand minor mergers.



Author: Matt S. Owers Swinburne-UNSW, Paul E.J. Nulsen CfA, Warrick J. Couch Swinburne, Maxim Markevitch CfA

Source: https://arxiv.org/







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