Interacciones de galaxias en medios de diferente densidad a partir del catálogo SDSS DR2

ALONSO, M. S.; GARCÍA LAMBAS, D.; TISSERA, P.; COLDWELL, G.

San Juan

Workshop; 47ª Reunión Anual de la Asociación Argentina de Astronomía; 2004

CASLEO

From the Sloan Digital Sky Survey, Data Release 2 (SDSS DR2), weconstruct a Catalog of 11274 pair galaxies with orbital parameters:rp< 100 kpc h-1 and Delta V < 350 km/sec. We analyze the starformation rate and colour indexes (u-r), (g-r) as a funcion of theorbital parameters in different environments. At low separation betweenpair members there is an important increase in the star formationactivity and the fraction of blue colour indexes, which indicates thatinteractions are responsible of triggering SFR, increasing the youngstellar population. The triggering of star formation by tidal torquesseems to be more efficient in low density environments