1项目历程问：硬X射线调制望远镜（The Hard X-ray Modulation Telescope,简称HXMT）是我国自主研制的第一颗X射线天文卫星。目前卫星的研制工作已经完成,将于近期择机发射。张教授,您能不能简单介绍一下为什么要发射这颗卫星？张双南...1项目历程问：硬X射线调制望远镜（The Hard X-ray Modulation Telescope,简称HXMT）是我国自主研制的第一颗X射线天文卫星。目前卫星的研制工作已经完成,将于近期择机发射。张教授,您能不能简单介绍一下为什么要发射这颗卫星？张双南：天体发出的辐射往往覆盖了从无线电到高能伽马射线的整个电磁波谱段。为了更好地研究天体的物理性质,或者借助于天体提供的极端物理环境研究一些基本的物理过程,展开更多
伽马射线暴(Gamma Ray Burst,GRB)的分类问题是天文学领域中未解决的热点问题。根据不同方法采用不同指标进行分类,导致的分类结果也不同。为了建立更合理的分类指标,本文以静止系峰值能量E_(p,i) E、各向同性瞬时等值能量E_(iso) 、瞬...伽马射线暴(Gamma Ray Burst,GRB)的分类问题是天文学领域中未解决的热点问题。根据不同方法采用不同指标进行分类,导致的分类结果也不同。为了建立更合理的分类指标,本文以静止系峰值能量E_(p,i) E、各向同性瞬时等值能量E_(iso) 、瞬时辐射持续时间T_(90,i) 作为解释变量,建立了广义线性分类模型,得到了一个新的分类响应指标gEHD。通过在benchmark数据集上的实验表明,gEHD指标和EHD指标具有等效的分类结果,可作为伽马射线暴Ⅰ型/Ⅱ型的一种新的分类依据。展开更多
Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different com...Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different commu-nities in the relevant fields,particularly between nuclear physicists and astrophysicists,we have organized the Dialo-gue at the Dream Field(DDF2024).The participants explored topics of various fields such as pulsar astrophysics,transient phenomena,hadronic and nuclear matter,supra-nuclear matter with quark degree of freedom,numerical relativity.This involved discussions on the mechanisms,model constructions,observational impacts,and introduc-tions of new facilities.In-depth exchanges were carried out through invited talks and free discussions,as well as a visit to view the FAST telescope.展开更多
文摘1项目历程问：硬X射线调制望远镜（The Hard X-ray Modulation Telescope,简称HXMT）是我国自主研制的第一颗X射线天文卫星。目前卫星的研制工作已经完成,将于近期择机发射。张教授,您能不能简单介绍一下为什么要发射这颗卫星？张双南：天体发出的辐射往往覆盖了从无线电到高能伽马射线的整个电磁波谱段。为了更好地研究天体的物理性质,或者借助于天体提供的极端物理环境研究一些基本的物理过程,
基金supported by Shanghai Jiao Tong University 2030 Initiative,Science and Technology Commission of Shanghai Municipality project (No.23JC1410200)Zhangjiang National Innovation Demonstration Zone project (No.ZJ2023-ZD-003)+7 种基金supported by the China-Chile Joint Research Fund under project CCJRF 2205, by FONDECYT grant 1201371the ANID BASAL project FB210003.YZC is supported by the National Natural Science Foundation of China (NSFC, Grant No.12303054)the Yunnan Fundamental Research Projects (Grant No.202401AU070063)the International Centre of Supernovae,Yunnan Key Laboratory (No.202302AN360001)supported by the NSFC (Grant No.12150009)supported by the NSFC through grants 12173029 and 12233013supported by the NSFC (Grant No.12120101003 and 12233008)supported by the NSFC (Grant No.12233003)
文摘Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different commu-nities in the relevant fields,particularly between nuclear physicists and astrophysicists,we have organized the Dialo-gue at the Dream Field(DDF2024).The participants explored topics of various fields such as pulsar astrophysics,transient phenomena,hadronic and nuclear matter,supra-nuclear matter with quark degree of freedom,numerical relativity.This involved discussions on the mechanisms,model constructions,observational impacts,and introduc-tions of new facilities.In-depth exchanges were carried out through invited talks and free discussions,as well as a visit to view the FAST telescope.
文摘利用Union2 557个Ia型超新星数据限制宇宙学参数qo、jo和so,在红移z≤1.4范围内校准5个γ暴(gamma-ray burst,GRB)光度关系.假设γ暴光度关系不随红移演化,得到66个高红移γ暴的距离模数.最后综合利用宇宙微波背景(Cosmic Microwave Background,CMB)辐射观测数据、重子声波震荡(Baryon AcousticOscillations,BAO)观测数据与116个具有红移的γ暴数据限制几个常见的暗能量模型.根据贝叶斯判据(Bayesian Information Criterion,BIC),发现ACDM模型是最好的模型;根据Akaike判据(Akaike Information Criterion,AIC),发现JBP模型是最好的模型.
