Compact Groups analysis using Weak Lensing

GONZALEZ ELIZABETH JOHANA; PEREIRA, MARÍA; MAKLER, MARTÍN; O'MILL, ANA ; CHALELA, MARTÍN; GARCÍA LAMBAS, DIEGO; SHAN, HUANYUAN

Córdoba

Congreso; 8th Friends of Friends Meeting; 2018

In this work we present a lensing study of Compact Groups (CGs) using data obtained from the high quality Canada-France-Hawaii Telescope Stripe 82 Survey. Using stacking techniques we obtain the average density contrast profile.We obtain a larger lensing signal for CGs with higher surface brightness, probably due to their lower contamination by interlopers. Also, we find a strong dependence of the lensing signal on the group concentration parameter, with the most concentrated quintile showing a significant lensing signal.