Estructura y Propiedades de Galaxias en el Entorno de Radiogalaxias

BORNANCINI CARLOS G.; MARTÍNEZ HÉCTOR J.; GARCÍA LAMBAS DIEGO; DE VRIES WIM; VAN BREUGEL WIL; DE BREUCK CARLOS; MINNITI DANTE

San Juan, Argentina

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2004

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.