检索结果-南通市图书馆

Long-term evolution of the X-ray flux of the crab pulsar

Radiation Detection Technology and Methods 2023年第1期7卷 48-55页

作者： Hai-Sheng Zhao Ming-Yu Ge Xiao-Bo Li Lin-Li Yan You-Li Tuo Fang-Jun Lu Li-Ming Song Cong-Zhan Liu Shu Zhang Shuang-Nan Zhang Key Laboratory for Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences19B Yuquan RoadBeijing 100049China School of Mathematics and Physics Anhui JianZhu UniversityHefei 230601AnhuiChina

Purpose In order to carry out in-orbit calibration,the hard X-ray modulation telescope satellite(HXMT)has made a number of observations of crab *** study the long-term evolution of the X-ray flux of the crab pulsar with these observational *** We use nearly four years crab pulsar’s data obtained by HXMT and the neutron star interior composition of explorer to test whether L_(x)∝L_(sd)^(α) holds for an individual pulsar,where L_(x) is the pulsed X-ray luminosity and Lsd is its spin-down *** also combine the earlier results obtained with PCA and HEXTE data(Yan et *** ApJ 865:21,2018)to get the long-term evolution characteristics of the crab *** We find the X-ray flux evolution can be fitted by a linear correlation:L_(x)∝L_(sd)^(1.42±0.18).In soft X-ray energy band(1–10 keV)and hard X-ray energy band(27–250 keV),αdoes not change significantly with either energy or ***,this will need to be confirmed in *** example,the interpulse component of hard X-ray may follow L_(x)∝L_(sd)^(0.96±0.34),which may be different from the correlation of soft X-rays and main pulse *** the other hand,the hard X-ray flux evolution shows that the performance of high energy X-ray telescope(HE)onboard HXMT,such as effective area,is *** We conclude that the X-ray luminosity of the crab pulsar closely correlates with its spin-down ***,the emission mechanism responsible for these phenomena remains not fully understood.

关键词： X-rays crab pulsar Flux evolution Spin-down luminosity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Building the crab pulsar timing model with XPNAV-1 observations

Building the Crab pulsar timing model with XPNAV-1 observati...

引用

第九届中国卫星导航学术年会

作者： Hai-feng Sun Jian-yu Su Liang Zhao Zhi-wei Liu Hai-yan Fang School of Aerospace Science and Technology Xidian University Science and Technology on Space Physics Laboratory Beijing Institute of Astronautical Systems Engineering

This paper addresses the problem of building the X-ray pulsar timing model that is an essential work for X-ray pulsar navigation(XNAV).We propose a theoretical discussion of the differences between the X-ray and radio pulsar timing and develop a complete processing *** this framework,the 2 mZ-test method is deduced by the theory of the Fourier Series Estimator(FSE) in the complex form.A fast maximum likelihood(FAML) estimator is applied for the estimation of pulse time of arrival(TOA).Then the model parameters are deduced based on a least-squares *** sustain this framework,about 173 ks observations with X-ray pulsar navigation-I(XPNAV-1) satellite over 30 days are utilized for experimental *** results show that the proposed framework is valid,and the phase residuals with the X-ray model parameters is 2.57 milliperiods.

关键词： X-ray pulsar navigation X-ray timing model crab pulsar XPNAV-1 satellite

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

强磁场中的逆Compton散射和crab pulsar的光学辐射

引用

中国科学:数学 1986年第7期 732-740页

作者：乔国俊吴鑫基鲍威夏晓阳北京大学地球物理系天津师范大学物理系

本文在非相对论极限下(B/B≤1,（?）/mc1),给出了强磁场中逆Compton散射的截面、偏振特性和散射光子能量的一般表达式,并在此基础上讨论了脉冲星外gap附近的次级高能粒子与gap脉动的低频光子的逆Compton散射产生crab pulsar光学辐射的... 详细信息

本文在非相对论极限下(B/B≤1,（?）/mc1),给出了强磁场中逆Compton散射的截面、偏振特性和散射光子能量的一般表达式,并在此基础上讨论了脉冲星外gap附近的次级高能粒子与gap脉动的低频光子的逆Compton散射产生crab pulsar光学辐射的可能性,这种机制可以较好地解释crab pulsar光学观测的主要特征。

关键词：脉冲星恒星 crab pulsar Compton 散射光子强磁场辐射机制光学乔国俊非相对论极限微分散射截面

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Timing Equation in X-ray pulsar Autonomous Navigation

The Timing Equation in X-ray Pulsar Autonomous Navigation

引用

第四届中国卫星导航学术年会

作者： Qingyong Zhou Jianfengi Hongfei Ren State Key Laboratory of Geo-information engineering Xi'an Research Institute of Surveying and Mapping Xi’an Research Institute of Surveying and Mapping

The timing equation is the basic theory of dealing with the observable data of pulsar. The pulse timing model is studied;the transformation equation of pulsar photon time of arrive in 1PN approximation is derived, and the existing transformation equations are compared and analyzed;the transformation of the proper time from the spacecraft to TCB is also obtained.

关键词： SSB pulse timing model crab pulsar time delay of gravity

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：