Discrimination of background events in the PolarLight X-ray polarimeter

被引：2

作者：

Zhu, Jiahuan ^{[1
]}

Li, Hong ^{[1
]}

Feng, Hua ^{[1
,2
]}

Huang, Jiahui ^{[2
]}

Long, Xiangyun ^{[2
]}

Wu, Qiong ^{[2
]}

Jiang, Weichun ^{[3
]}

Minuti, Massimo ^{[4
]}

Citraro, Saverio ^{[4
]}

Nasimi, Hikmat ^{[4
]}

Yang, Dongxin ^{[2
]}

Yu, Jiandong ^{[5
]}

Jin, Ge ^{[6
]}

Zeng, Ming ^{[2
]}

An, Peng ^{[5
]}

Baldini, Luca ^{[4
]}

Bellazzini, Ronaldo ^{[4
]}

Brez, Alessandro ^{[4
]}

Latronico, Luca ^{[7
]}

Sgro, Carmelo ^{[4
]}

Spandre, Gloria ^{[4
]}

Pinchera, Michele ^{[4
]}

Muleri, Fabio ^{[8
]}

Soffitta, Paolo ^{[8
]}

Costa, Enrico ^{[8
]}

机构：

[1] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[4] INFN Pisa, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[5] Ningbo Univ Technol, Sch Elect & Informat Engn, Ningbo 315211, Peoples R China

[6] North Night Vis Technol Co Ltd, Nanjing 211106, Peoples R China

[7] Ist Nazl Fis Nucl, Sez Torino, Via Pietro Giuria 1, I-10125 Turin, Italy

[8] IAPS INAF, Via Fosso del Cavaliere 100, I-00133 Rome, Italy

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2021年 / 21卷 / 09期

基金：

中国国家自然科学基金;

关键词：

instrumentation; polarimeters; methods; data analysis; X-rays; general;

D O I：

10.1088/1674-4527/21/9/233

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

PolarLight is a space-borne X-ray polarimeter that measures the X-ray polarization via electron tracking in an ionization chamber. It is a collimated instrument and thus suffers from the background on the whole detector plane. The majority of background events are induced by high energy charged particles and show ionization morphologies distinct from those produced by X-rays of interest. Comparing on-source and off-source observations, we find that the two datasets display different distributions on image properties. The boundaries between the source and background distributions are obtained and can be used for background discrimination. Such a means can remove over 70% of the background events measured with PolarLight. This approaches the theoretical upper limit of the background fraction that is removable and justifies its effectiveness. For observations with the Crab nebula, the background contamination decreases from 25% to 8% after discrimination, indicative of a polarimetric sensitivity of around 0.2 Crab for PolarLight. This work also provides insights into future X-ray polarimetric telescopes.

引用

页数：5

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