(Proposal ID) S15B-056

(PI) Okabe, Nobuhiro

(Proposal Title)
Probing the Assembly Histories of BCGs and Dark Matter Halos by Exploiting Synergies between the MaNGA Survey and HSC at z~0.1

(Abstract)
We propose a systemic joint study of the weak gravitational lensing effect of 
very nearby, thirty galaxy clusters and the stellar kinematics of their 
brightest cluster galaxies (BCGs) for a deeper understanding of the physical 
interplay between galaxies and dark matter. The dark matter profiles 
surrounding the BCGs are fundamentally correlated with their growth history. 
Combining two independent, complementary data sets, namely the exquisite 
images of HSC, spanning the entire region of host clusters, and the legacy-
type spectroscopic data of the SDSS MaNGA survey, we will precisely measure 
the stellar mass, dark matter and the total mass profiles by breaking the 
degeneracy between the dark matter mass and the stellar initial mass function. 
We aim to (1) accurately measure the stellar mass, dark matter, and the total 
mass profiles, (2) constrain the inner slope of dark matter profiles, (3) 
compute the baryon fraction, and (4) study merger signatures as a function of 
halo mass. Our systematic study of HSC WL and MaNGA spectroscopic data on a 
uniform, complete sample of the thirty clusters enables us to study the 
correlations between cluster and central galaxy properties and dark matter 
profiles.