A Study of Background Conditions for Sphinx-The Satellite-Borne Gamma-Ray Burst Polarimeter

被引：10

作者：

Xie, Fei ^{[1
,2
]}

Pearce, Mark ^{[1
,2
]}

机构：

[1] KTH Royal Inst Technol, Dept Phys, S-10691 Stockholm, Sweden

[2] AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, S-10691 Stockholm, Sweden

来源：

GALAXIES | 2018年 / 6卷 / 02期

关键词：

polarimeter; Compton scattering; GRB; background;

D O I：

10.3390/galaxies6020050

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

SPHiNX is a proposed satellite-borne gamma-ray burst polarimeter operating in the energy range 50-500 keV. The mission aims to probe the fundamental mechanism responsible for gamma-ray burst prompt emission through polarisation measurements. Optimising the signal-to-background ratio for SPHiNX is an important task during the design phase. The Geant4 Monte Carlo toolkit is used in this work. From the simulation, the total background outside the South Atlantic Anomaly (SAA) is about 323 counts/s, which is dominated by the cosmic X-ray background and albedo gamma rays, which contribute similar to 60% and similar to 35% of the total background, respectively. The background from albedo neutrons and primary and secondary cosmic rays is negligible. The delayed background induced by the SAA-trapped protons is about 190 counts/s when SPHiNX operates in orbit for one year. The resulting total background level of similar to 513 counts/s allows the polarisation of similar to 50 GRBs with minimum detectable polarisation less than 30% to be determined during the two-year mission lifetime.

引用

页数：9

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