INVESTIGADORES
MURIEL Hernan
artículos
Título:
Galaxy groups in the 2dF Galaxy Redshift Survey: a compactness analysis of groups.
Autor/es:
ZANDIVAREZ, A.; DOMÍNGUEZ, M. J. L.; RAGONE, C. J.; MURIEL, H.; MARTÍNEZ, H. J.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2003 vol. 340 p. 1400 - 1408
ISSN:
0035-8711
Resumen:
A comprehensive study on compactness has been carried out on the 2dF
Galaxy Group Catalogue constructed by Merchán and Zandivarez. The
compactness indices defined in this work take into account different
geometrical constraints in order to explore a wide range of
possibilities. Our results show that there is no clear distinction
between groups with high and low levels of compactness when considering
particular properties such as the radial velocity dispersion, the
relative fraction of galaxies per spectral type, and the luminosity
functions of their galaxy members. Studying the trend of the fraction of
galaxies per spectral type as a function of the dimensionless crossing
time, some signs of dynamical evolution are observed. From the
comparison with previous works on compactness, we realize that special
care should be taken for some compactness criteria definitions in order
to avoid possible biases in the identification.