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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Galaxy distribution and evolution around a sample of 2dF groups

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Ribeiro, A. L. B. [1] ; Trevisan, M. [2] ; Lopes, P. A. A. [3] ; Schilling, A. C. [1]
Total Authors: 4
[1] Univ Estadual Santa Cruz, Lab Astrofis Teor & Observac, Dept Ciencias Exatas & Tecnol, BR-45650000 Ilheus, BA - Brazil
[2] Univ Sao Paulo, Inst Astron & Geofis, BR-09500900 Sao Paulo - Brazil
[3] IP&D Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Astronomy & Astrophysics; v. 505, n. 2, p. 521-528, OCT 2009.
Web of Science Citations: 3

Context. We study galaxy evolution and spatial patterns in the surroundings of a sample of 2dF groups. Aims. Our aim is to find evidence of galaxy evolution and clustering out to 10 times the virial radius of the groups and so redefine their properties according to the spatial patterns in the fields and relate them to galaxy evolution. Methods. Group members and interlopers were redefined after the identification of gaps in the redshift distribution. We then used exploratory spatial statistics based on the the second moment of the Ripley function to probe the anisotropy in the galaxy distribution around the groups. Results. We found an important anticorrelation between anisotropy around groups and the fraction of early-type galaxies in these fields. Our results illustrate how the dynamical state of galaxy groups can be ascertained by the systematic study of their neighborhoods. This is an important achievement, since the correct estimate of the extent to which galaxies are affected by the group environment and follow large-scale filamentary structure is relevant to understanding the process of galaxy clustering and evolution in the Universe. (AU)

FAPESP's process: 06/04955-1 - Scaling relations and photometric properties of galaxy clusters
Grantee:Paulo Afranio Augusto Lopes
Support type: Research Grants - Young Investigators Grants