Caracterización del entorno del los blazares PG1553+113 y 3C66A con datos GEMINI-GMOS en las bandas g' e i'

TORRES ZAFRA, JUANITA; CELLONE, S.A.; ANDRUCHOW, I.

Tandil

Congreso; 56 Reunión Anual de la Asociación Argentina de Astronomía; 2013

AAA

The blazars PG1553+113 and 3C66A have been recently detected at TeV energies -rays; however; an accurate modelling of their electromagnetic emission as well as -ray absorption by the extragalactic background light (EBL) are prevented by their lack of firm redshift determinations. This is due to the fact that; being objects of the BLLac subclass; their optical spectral have by definition very faint emission lines. In this paper the environment of both objects is photometrically analyzed; looking for overdensities that may trace galaxy clusters. Comparing magnitudes and colors of detected object to those of model galaxies allows us to provide a new constraint to the redshifts of both blazars.