Fermi-LAT Observation of PSR B1259-63 during Its 2021 Periastron Passage

被引：11

作者：

Chang, Zhi ^{[1
]}

Zhang, Shu ^{[1
]}

Chen, Yu-Peng ^{[1
]}

Ji, Long ^{[2
]}

Kong, Ling-Da ^{[1
,3
]}

Wang, Peng-Ju ^{[1
,3
]}

机构：

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

[2] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

UNIVERSE | 2021年 / 7卷 / 12期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

gamma rays; pulsars: PSR B1259-63; Be; SYSTEM; PULSAR;

D O I：

10.3390/universe7120472

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

PSR B1259-63 is a gamma-ray binary system, where the compact object is a pulsar. The system has an orbital period of 1236.7 days and shows peculiar gamma-ray flares (in 100 MeV-300 GeV) after its periastron time. We analyzed the Fermi-LAT observation of PSR B1259-63 during its latest periastron passage, as well as its previous three periastrons. The bright GeV flares started about 60 days after the periastron epoch in 2021. This delay is larger than that around the 2017 periastron and much larger than earlier periastrons. The delay of the GeV flux peak time in each periastron passage is apparent in our results. We discussed the possible origin of this delay and made a prediction of the GeV flux peak time in next periastron passage, based on observation of the previous delays.

引用

页数：8

共 28 条

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