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

被引：46

作者：

Burgett, WS

Vick, MM

Davis, DS

Colless, M

De Propris, R

Baldry, I

Baugh, C

Bland-Hawthorn, J

Bridges, T

Cannon, R

Cole, S

Collins, C

Couch, W

Cross, N

Dalton, G

Driver, S

Efstathiou, G

Ellis, R

Frenk, CS

Glazebrook, K

Hawkins, E

Jackson, C

Lahav, O

Lewis, I

Lumsden, S

Maddox, S

Madgwick, D

Norberg, P

Peacock, JA

Percival, W

Peterson, B

Sutherland, W

Taylor, K

机构：

[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[2] Univ Texas, Dept Phys, Richardson, TX 75083 USA

[3] UMBC, Dept Phys, Joint Ctr Astrophys, Baltimore, MD 21250 USA

[4] NASA, Goddard Space Flight Ctr, Lab High Energy Astrophys, Greenbelt, MD 20771 USA

[5] Anglo Australian Observ, Epping, NSW 2121, Australia

[6] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[7] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[8] Univ Durham, Dept Phys, Durham DH1 3LE, England

[9] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada

[10] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead L14 1LD, Merseyside, England

[11] Univ New S Wales, Dept Astrophys, Sydney, NSW 2052, Australia

[12] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[13] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[14] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[15] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[16] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[17] CSIRO Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[18] Univ Leeds, Dept Phys, Leeds LS2 9JT, W Yorkshire, England

[19] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[20] ETH Honggerberg, ETHZ Inst Astron, CH-8093 Zurich, Switzerland

[21] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2004年 / 352卷 / 02期

关键词：

galaxies : clusters : general; large-scale structure of Universe;

D O I：

10.1111/j.1365-2966.2004.07952.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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).

引用

页码：605 / 654

页数：50

共 52 条

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