학과 세미나

콜로키움

2022년 9월 29일 세미나 공고문
2022년 9월 29일 세미나 공고문
작성자 천문우주과학과
조회수 273 등록일 2022.09.13

일시:  2022년 9월 29일 목요일 오후 4시 세미나실(자4514호)


연사: 이보미 박사님(한국천문연구원)

 

제목: Probing the nature of dark matter in the z > 1 Universe with infrared weak gravitational lensing

 

초록:  

Measuring weak gravitational lensing (WL) is a powerful probe of the distribution of dark matter and constraining dark energy. Therefore, WL is a primary science goal for the next decade of large extragalactic surveys, such as Rubin, Euclid, and Roman. Currently, however, the WL analysis as primarily been on optical-band data. Near-infrared (NIR) imaging has thus never been used for wide-field weak lensing measurements although it is now well-known that it provides superior galaxy shape measurement at z >1. We have undertaken a Near-IR Weak-Lensing (NIRWL) which is the first WL study with the largest set of high resolution archival NIR images from the two widest Hubble Space Telescope (HST)/WFC3 survey: CANDELS and COSMOS-DASH. By leveraging the current state-of-the-art understanding of NIR detector systematics, this project will serve as acritical stepping stone for cosmological measurement with upcoming surveys. In this talk, I will first give a brief introduction of weak gravitational lensing and the future WL surveys. Then, I will focus on two important measures for the WL analysis: shape measurements with near-infrared imaging and redshift estimates. In the end, I will present some early results from the NIRWL project with CANDELS data.  


참고자료:

https://arxiv.org/pdf/1710.03235.pdf : R. Mandelbaum 2018 2018ARA&A..56..393M

https://iopscience.iop.org/article/10.3847/1538-4357/aadfd7/pdf : B. Lee et al. 2018