Sistemas de galaxias luminosas rojas: Supercúmulos a partir de sobredensidades de galaxias en el catálogo fotométrico del SDSS.

LUPARELLO, H.; LARES, MARCELO; GARCIA LAMBAS, DIEGO RODOLFO

San Juan

Congreso; 51 Reunión Anual de la Asociación Argentina de Astronomía; 2008

Asociación Argentina de Astronomía

We identify luminous red galaxy (LRG) systems in the Sloan Survey, using a percolation algorithm. We find 737 systems with at least 4 members, on a total of 17977 LRGs in the range 0.30<z<0.45. Galaxy systems where clasified acording to shape and compactness. We analyze overdensity of galaxies in the photometric parent catalogue and compare the peack locations with the LRG positions. We find that there is a close relation between the locations of LRG systems and fainter galaxies observable up to m_r=22. The spatial distribution of galaxies around LRGs suggests a dependence on the compactness of the LRG group.  We identify systems of luminous red galaxies (LRGs) in the SDSS, using a percolation algorithm. We find 17977 systems in the redshift range 0.30 < z < 0.45, out of which 737 have at least 4 members.  Galaxy systems were classified according to their geometric shape and compactness. We search for faint galaxy overdensity variations around these systems in the photometric catalogue finding significant overdensities associated to these systems. The shapes of the overdensity regions suggest a dependence on the compactness of the systems of LRGs.