Substructure analysis of selected low-richness 2dFGRS clusters of galaxies
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 fo...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2004-08, Vol.352 (2), p.605-654 |
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| creator | 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 |
| description | 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). |
| doi_str_mv | 10.1111/j.1365-2966.2004.07952.x |
| format | Article |
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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
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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
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Not. R. Astron. Soc</stitle><date>2004-08</date><risdate>2004</risdate><volume>352</volume><issue>2</issue><spage>605</spage><epage>654</epage><pages>605-654</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>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).</abstract><cop>23 Ainslie Place , Edinburgh EH3 6AJ , UK . Telephone 226 7232 Fax 226 3803</cop><pub>Blackwell Science Ltd</pub><doi>10.1111/j.1365-2966.2004.07952.x</doi><tpages>50</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Monthly notices of the Royal Astronomical Society, 2004-08, Vol.352 (2), p.605-654 |
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| language | eng |
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| source | Oxford University Press Open Access; Wiley-Blackwell Full Collection |
| subjects | galaxies: clusters: general large-scale structure of Universe |
| title | Substructure analysis of selected low-richness 2dFGRS clusters of galaxies |
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