Sangjun Cha
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)
Room 1207 · Astronomy-Mathematics Building, AS/NTU · No. 1, Sec. 4, Roosevelt Rd. · Taipei 106319 · Taiwan, R.O.C.Email: scha@asiaa.sinica.edu.tw
Image: Cha et al. (2025); Data: JWST (NASA/ESA/CSA/STScI), DECam (CTIO/NOIRLab/NSF/AURA), Chandra (NASA/CXC), MeerKAT (SARAO)
About Me
I am a postdoctoral researcher and EACOA Fellow at the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), studying galaxy clusters and dark matter through gravitational lensing. I develop MARS and MrMARTIAN, two lensing mass reconstruction methods. I apply them to strong and weak lensing observations from JWST, HST, and wide field imaging surveys. My work maps mass across a broad range of scales, from dense cluster cores to intracluster filaments. By combining lensing mass reconstruction with multiwavelength observations, I study how massive galaxy clusters assemble and evolve.
For talks, awards, and a complete academic record, please see my CV .