Two Degree Field Galaxy Redshift Survey and Sloan Digital Sky Survey Galaxy Group Density Profiles

DÍAZ, EUGENIA; ZANDIVAREZ, ARIEL; MERCHÁN, MANUEL E.; MURIEL, HERNÁN

ASTROPHYSICAL JOURNAL

THE UNIVERSITY OF CHICAGO PRESS

Lugar: Chicago; Año: 2005 vol. 629 p. 158 - 171

0004-637X

We have analyzed the distribution of galaxies in groups identified in the largest redshift surveys available at present: the final release of the 2dF Galaxy Redshift Survey and the first release of the Sloan Digital Sky Survey. Our work comprises the study of the galaxy density profiles and the fraction of galaxies per spectral type as a function of the groupcentric distance. We have calculated the projected galaxy density profiles of galaxy groups using composite samples in order to increase the statistical significance of the results. Special care has been taken in order to avoid possible biases in the group identification and the construction of the projected galaxy density profile estimator. The results show that the projected galaxy density profiles obtained for both redshift surveys are in agreement with a projected Navarro, Frenk, and White prediction in the range 0.15