Structure and properties of galaxies in the environment of high redshift radio galaxies

BORNANCINI, C.; HECTOR JULIAN MARTINEZ; LAMBAS, D. G.; DE VRIES, W.; VAN REUGEL, W.; DE BREUCK, C.; MINNITI, D.

San Juan, Argentina

Congreso; Reunion Anual de la Asociacion Argentina de Astronomia; 2004

Asociacion Argentina de Astronomia

We have analyzed galaxy properties in the neighborhood of 20 Ultra-Steep Spectrum Radio sources (USS) taken from the WISH catalog of De Breuck et al. (2002). Galaxies in these USS fields were identified in deep observations that were carried out in the K'- band using the OSIRIS imager at CTIO 4m telescope. We find a statistically significant signal of clustering around our sample of USS. The angular extension of the detected USS-galaxy clustering is theta_c ~ 20" corresponding to a spatial scale ~ 120 h (exp -1) kpc, assuming the sources are at z ~ 1 in a Omega_m = 0.3, Omega_Lambda = 0.7 model universe. These results are in agreement with those obtained by Best (2000) for radio galaxy-galaxy correlation and Best et al. (2003) for radio-loud AGN-galaxy correlation. We have also analyzed the light distribution of the galaxies by fitting Sérsic's law profiles. Our results show no significant dependence of the galaxy shape parameters on the projected distance to the USS.