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The total stellar mass in a cluster, plotted on the y-axis, is found to be proportional to the total mass of the cluster (shown on the x-axis). What is more surprising is that the proportionality does not seem to evolve with time (the 4 points in the Figure represent clusters at 4 different cosmic epochs). More theoretical studies are needed to understand the origin of such a lack of evolution of this scaling relation.

Subaru conducts latest population census of galaxy clusters

The metrology camera optics under tests in ASIAA

The first color image (M31) of HSC. (Picture Credit: National Astronomical Observatory of Japan)

The first color image (M31) of HSC_zoomed

The Prime focus instrument of PFS.

The first color image of HSC.

The FEU running with HSC installed

The FEU running with HSC during the observation

The HSC (Hyper SuprimeCam) installed on the Subaru telescope (top) with the FES attached (bottom).

Subaru Telescope Collaboration

Prime Focus Spectrograph (PFS) for Subaru Telescope

Subaru BVRIz composite color images centered on the galaxy cluster MACS1206 (z=0.439), overlaid with mass contours from our joint strong-and-weak lensing analysis of HST and Subaru observations. The image size in the left panel is 24 arcminutes (~8Mpc) on a side. The cluster is fairly centrally concentrated
in projection, and associated with elongated large scale structure running north-east south-east, both in the projected mass and galaxy distributions.

Mass Distribution in and around the Galaxy Cluster MACS J1206.2-0847

Subaru BRZ pseudo color image of the central 3'x3' region of the galaxy cluster CL0024+1654 (taken and modified from Umetsu et al. 2010, arXiv:0908.0069).

Lensing galaxy cluster CL0024+1654 (z=0.395)

本所自2008年起與日本國家天文台的Subaru 望遠鏡團隊合作，負責廣角可見光相機Hyper Suprime-Cam（HSC）。它將是最大型的光學廣角相機，總共有116片的800萬像素 CCD 晶片緊密排列，可涵蓋1.5度的視野，比現有的廣角相機 Suprime Cam 增加十倍。搭配Subaru望遠鏡，將可提供全球最高的整體觀測效率（觀測效率與口徑乘以視野大小的乘積成正比）。HSC主要的科學目標將是對大範圍天區進行弱重力透鏡研究，預計五年內觀測約兩千平方度。由弱重力透鏡效應將可以觀測大天區星系團質量的整體分布（含一般物質與暗物質）。從星系團的分佈將能檢驗出宇宙的切變，並界定暗能量對宇宙加速的角色。