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Substructure analysis of selected low-richness 2dFGRS clusters of galaxies

Burgett, William S.; Vick, Michael M.; Davis, David S.; Colless, Matthew; De Propris, Roberto; Baldry, Ivan; Baugh, Carlton; Bland-Hawthorn, Joss; Bridges, Terry; Cannon, Russell; Cole, Shaun; Collins, Chris; Couch, Warrick; Cross, Nicholas; Dalton, Gavin; Driver, Simon; Efstathiou, George; Ellis, Richard; Frenk, Carlos S.; Glazebrook, Karl; Hawkins, Edward; Jackson, Carole; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Steve; Madgwick, Darren; Norberg, Peder; Peacock, John A.; Percival, Will; Peterson, Bruce; Sutherland, Will; Taylor, Keith

Authors

William S. Burgett

Michael M. Vick

David S. Davis

Matthew Colless

Roberto De Propris

Ivan Baldry

Joss Bland-Hawthorn

Terry Bridges

Russell Cannon

Chris Collins

Warrick Couch

Nicholas Cross

Gavin Dalton

Simon Driver

George Efstathiou

Richard Ellis

Karl Glazebrook

Edward Hawkins

Carole Jackson

Ofer Lahav

Ian Lewis

Stuart Lumsden

Steve Maddox

Darren Madgwick

John A. Peacock

Will Percival

Bruce Peterson

Will Sutherland

Keith Taylor



Abstract

Complementary one-, two- and three-dimensional tests for detecting the presence of substructure in clusters of galaxies are applied to recently obtained data from the 2dF Galaxy Redshift Survey. The sample of 25 clusters used in this study includes 16 clusters not previously investigated for substructure. Substructure is detected at or greater than the 99 per cent confidence level in at least one test for 21 of the 25 clusters studied here. From the results, it appears that low-richness clusters commonly contain subclusters participating in mergers. About half of the clusters have two or more components within 0.5 h−1 Mpc of the cluster centroid, and at least three clusters (Abell 1139, Abell 1663 and Abell S333) exhibit velocity–position characteristics consistent with the presence of possible cluster rotation, shear, or infall dynamics. The geometry of certain features is consistent with influence by the host supercluster environments. In general, our results support the hypothesis that low-richness clusters relax to structureless equilibrium states on very long dynamical time-scales (if at all).

Citation

Burgett, W. S., Vick, M. M., Davis, D. S., Colless, M., De Propris, R., Baldry, I., …Taylor, K. (2004). Substructure analysis of selected low-richness 2dFGRS clusters of galaxies. Monthly Notices of the Royal Astronomical Society, 352(2), 605-654. https://doi.org/10.1111/j.1365-2966.2004.07952.x

Journal Article Type Article
Publication Date 2004-08
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 352
Issue 2
Pages 605-654
DOI https://doi.org/10.1111/j.1365-2966.2004.07952.x
Related Public URLs http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004MNRAS.352..605B&db_key=AST