Ultra-deep catalog of X-ray groups in the Extended Chandra Deep Field South

A. Finoguenov, M. Tanaka, M. Cooper +22

Ultra-deep observations of ECDF-S with Chandra and XMM-Newton enable a search for extended X-ray emission down to an unprecedented flux of $2\times 10^{-16}$ ergs s${}^{-1}$ cm${}^{-2}$…