Insights into Galaxy Groups from ECDF-S Observations

ECDF-S, led by Alexis Finoguenov, has provided a unique catalog of galaxy groups with low halo masses. Comparisons with weak lensing signal and clustering show good agreement, while Planck13 LCDM predictions can be adjusted by increasing group masses. Limited structure in CDFS within the 0.2 < z < 0

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