Various regions around a cluster may be in different states at the same time

Various regions around a cluster may be in different states at the same time

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Various regions around a cluster may be in different states at the same time - in fact, usually are. Even local distance/redshift data show that there is a large region with systematic infall toward the Virgo cluster. As shown in the CAIRNS survey (one reference is Rines et al. 2003, AJ 126, 2152, from which the following picture is used courtesy of the AAS), rich clusters are generally surrounded by a dynamically distinct region of infall, complete with a turnaround radius visible in the angle-redshift slice of phase space. In one dimension, these regions can be detected (at least in principle) as S-shaped perturbations to the Hubble redshift-distance relation, where there are systemastic streaming motions in front of and behind rich clusters. Along with large-scale clustering structure, redshift surveys have revealed its inverse - voids with dimensions 100 Mpc devoid of luminous galaxies. They also occur in the single dimension probed by QSO absorption lines using the Lyman α forest
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This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Various regions around a cluster may be in different states at the same time

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