Correlación espacial bipuntual Quasar-Galaxia

HECTOR JULIAN MARTINEZ; LAMBAS, D. G.

San Juan, Argentina

Congreso; Reunion Anual de la Asociacion Argentina de Astronomia; 1997

CASLEO

We compute the two-point quasar-galaxy projected cross-correlation function w(rp) for a sample of quasars in the south galactic pole. The tracer galaxies was selected from the Edinburgh-Durham Galaxy Catalog hereafter COSMOS. We calculated the expected distribution of redshifts N(z) for different cuts in apparent magnitude in order to optimize the correlation amplitude. We adopt a redshift cutoff zcut=0.4 for the quasars and a limitting magnitude mlim=19.7 for the COSMOS tracer galaxies. We find a positive signal of correlation between our sample of quasars and the galaxies on scales rp < 5 Mpc h-1. At scales of the order of a Mpc, however, there is a significant decrease in the number of correlated galaxies. This might be indicative of a modulation of galaxy formation by the presence of quasars.