Weak Lensing Mass Measurements of Substructures in COMA Cluster with Subaru/Suprime-Cam

Understand

We obtain the projected mass distributions for two Subaru/Suprime-Cam fields in the southwest region (r\simlt 60') of the Coma cluster (z=0.0236) by weak lensing analysis and detect eight subclump candidates.

• We quantify the contribution of background large-scale structure (LSS) on the projected mass distributions using SDSS multi-bands and photometric data, under the assumption of mass-to-light ratio for field galaxies.
• We find that one of eight subclump candidates, which is not associated with any member galaxies, is significantly affected by LSS lensing.
• The mean projected mass for seven subclumps extracted from the main cluster potential is <M_2D^(corr)> = (5.06\pm1.30)10^12h^-1 M_sun after a LSS correction.