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Title:
Fossil Groups in the Sloan Digital Sky Survey
Authors:
Santos, Walter A.; Mendes de Oliveira, Claudia; Sodré, Laerte, Jr.
Affiliation:
AA(Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-090 São Paulo, Brazil), AB(Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-090 São Paulo, Brazil), AC(Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-090 São Paulo, Brazil)
Publication:
The Astronomical Journal, Volume 134, Issue 4, pp. 1551 (2007). (AJ Homepage)
Publication Date:
10/2007
Origin:
IOP
DOI:
10.1086/521341
Bibliographic Code:
2007AJ....134.1551S

Abstract

A search for fossil groups in the Sloan Digital Sky Survey was performed using virtual observatory tools. A cross-match of the positions of all SDSS luminous red galaxies (with r < 19 and measured spectroscopic redshifts) with sources in the ROSAT All-Sky Survey catalog resulted in a list of elliptical galaxies with extended X-ray emission (with a galaxy/ROSAT-source distance of less than 0.5′ in all cases). A search for neighbors of the selected elliptical galaxies within a radius of 0.5 h Mpc was conducted, taking into account the r-band magnitudes and spectroscopic or photometric redshifts of all objects within this area, leading to a sample of 34 candidate fossil groups. Considering this sample, the estimated space density of fossil systems is n = (1.0 ± 0.6) × 10-6 h Mpc-3.
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