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2020天文年會
中研院天文所 國際會議廳

論文摘要

Feasibility of Observing Gamma-Ray Polarization from Cygnus X-1 Using a CubeSat with GAGG scintillator

[ Oral ]

Jr-Yue Hsiang (NTHU)Hsiang-Kuang Chang (NTHU); Chien-Ying Yang (NTHU);Yi-Chi Chang(NTHU);Che-Yen Chu(NTHU);Jeng-Lun Chiu(NTHU);Chih-Hsun Lin(Institute of Physics, Academia Sinica, Taipei, Taiwan);Philippe Laurent(CEA/DRF/IRFU/DAp, Saclay, France);Jerome Rodriguez(CEA/DRF/IRFU/DAp, Saclay, France); Yun-Hsin Chung(NTHU);Tzu-Hsiang Su(NTHU)

Compton polarimeter(Compol), one of Compton telescope onboard a 3U Cubesat, works on gamma-ray polarization. In previous work(Yang et al. 2017), we took cerium bromide(CeBr3) as scintillators and reported a feasibility study on gamma-ray polarization for CygnusX-1. In this study, we replace CeBr3 with new material, Gd2A12Ga3012(GAGG) as the scintillators. There mainly come to two reasons: 1. Density of GAGG (6g/cm^3) is roughly 1.2 times larger than CeBr3(5.1g/cm^3), which enlarges the number of interactions of photon hits. 2. GAGG doesn't have the characteristic of being highly deliquescent but CeBr3 has. The results show that GAGG is more proper to be scintillators than CeBr3 for the use of polarization. First, it enhances the Compton efficiency of Compol due to a lot more detection of Compton events than the old version. Furthermore, it shows lower Minimum detection Polarization(MDP) to about 10% in 160-250 keV, 14% in 250-400 keV, and 35% in 400-2000 keV. In other words, this revision leads to better performance of polarization-sensitive detection.