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• W3103262677 endingPage "4809" @default.
• W3103262677 startingPage "4795" @default.
• W3103262677 abstract "A large sample of Abell clusters of galaxies, selected for the likely presence of a dominant galaxy, is used to study the dynamical properties of brightest cluster members (BCMs). From visual inspection of Digitized Sky Survey images combined with redshift data we identify 1426 candidate BCMs in 1221 redshift components in 1169 different Abell clusters, the largest such sample published so far. By our own morphological classification we find ~92% of these BCMs to be early-type galaxies, and 48% of cD type. We confirm previous findings based on much smaller samples, namely that a large fraction of BCMs have significant peculiar velocities. For a subsample of 452 clusters with at least 10 measured radial velocities, we find a median BCM peculiar velocity of 32% of their host clusters' radial velocity dispersion. This suggests that most BCMs are not at rest in the potential well of their clusters, and that the phenomenon is thus not a special trait of clusters hosting cD galaxies. We show that the peculiar velocity of the BCM is independent of cluster richness and only slightly dependent on the Bautz-Morgan type. We also find a weak trend for the peculiar velocity to rise with the cluster velocity dispersion. The strongest dependence is with the morphological type of the BCM: cD galaxies tend to have lower relative peculiar velocities than elliptical galaxies. This result points to a connection between the formation of the BCMs and that of their clusters. Our data are qualitatively consistent with the merging-groups scenario, where BCMs in clusters formed first in smaller subsystems comparable to compact groups of galaxies. In this scenario, clusters would have formed recently from the mergers of many such groups and would still be in a dynamically unrelaxed state." @default.
• W3103262677 created "2020-11-23" @default.
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• W3103262677 creator A5080037153 @default.
• W3103262677 creator A5085690407 @default.
• W3103262677 date "2009-04-29" @default.
• W3103262677 modified "2023-10-14" @default.
• W3103262677 title "THE DYNAMICAL STATE OF BRIGHTEST CLUSTER GALAXIES AND THE FORMATION OF CLUSTERS" @default.
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• W3103262677 doi "https://doi.org/10.1088/0004-6256/137/6/4795" @default.
• W3103262677 hasPublicationYear "2009" @default.
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