談話会案内

日時

2017年7月24日(月) 15:00

場所

合同C棟大輪講

講演者

Anton Timur Jaelani（東北大学天文専攻）

題目

Concentration-mass relation from intermediate-high redshift strong lensing galaxy groups

要旨

Structure formation from numerical simulations of dark matter suggest universal mass density profiles within gravitationally bound halos from the most massive clusters down to less massive galaxy groups. This universal density profile is often represented by a concentration-Mass (c-M) relation. Observational studies using methods such as weak lensing, X-rays and strong lensing have found a c-M relation almost consistent with expectation from simulations at cluster scales whereas our understanding of the mass distritbution at the less massive group scales is incomplete. We present the first measurements of the c-M relation at intermediate-high redshifts (z = 0.4 - 1.0) in strong lensing galaxy groups by combining the strong lensing mass with the halo mass from mass-richness relation. We also compared our results with another strong lensing measurements. We are still strugling with systematic biases in our measurement. Mention that these constraints will be improved once we have source redshifts and other necessary data. Thanks for HSC SSP survey, we can extend our work in the future.