检索结果-南通市图书馆

The physics of fast radio bursts

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 35-66页

作者： Di Xiao FaYin Wang zigao dai School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210023China

In 2007, a very bright radio pulse was identified in the archival data of the Parkes Telescope in Australia, marking the beginning of a new research branch in astrophysics. In 2013, this kind of millisecond bursts with extremely high brightness temperature takes a unified name, fast radio burst(FRB). Over the first few years, FRBs seemed very mysterious because the sample of known events was limited. With the improvement of instruments over the last five years, hundreds of new FRBs have been *** field is now undergoing a revolution and understanding of FRB has rapidly increased as new observational data increasingly accumulate. In this review, we will summarize the basic physics of FRBs and discuss the current research progress in this *** have tried to cover a wide range of FRB topics, including the observational property, propagation effect, population study,radiation mechanism, source model, and application in cosmology. A framework based on the latest observational facts is now under construction. In the near future, this exciting field is expected to make significant breakthroughs.

关键词： fast radio burst neutron star cosmology

An Intermediate-field Fast Radio Burst Model and the Quasi-periodic Oscillation

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第3期23卷 93-99页

作者： Jie-Shuang Wang Xinyu Li zigao dai Xuefeng Wu Max-Planck-Institut für Kernphysik Saupfercheckweg 1D-69117 HeidelbergGermany Canadian Institute for Theoretical Astrophysics 60 St George StTorontoON M5R 2M8Canada Perimeter Institute for Theoretical Physics 31 Caroline Strect North.watcrlooOntarioN2L 2Y5Canada Department of Astronomy University of Science and Technology of ChinaHefei20026China School of Astronomy and Space Science Nanjing UniversityNanjng 210023.China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China

Quasi-periodic oscillation(QPO)signals are discovered in some fast radio bursts(FRBs)such as FRB 20191221A,as well as in the X-ray burst associated with the galactic FRB from SGR 1935+*** revisit the intermediatefield FRB model where the radio waves are generated as fast-magnetosonic waves through magnetic reconnection near the light *** current sheet in the magnetar wind is compressed by a low frequency pulse emitted from the inner magnetosphere to trigger magnetic *** incorporating the wave dynamics of the magnetosphere,we demonstrate how the FRB frequency,the single pulse width,and luminosity are determined by the period,magnetic field,QPO frequency and quake energetics of the *** find that this model can naturally and self-consistently interpret the X-ray/radio event from SGR 1935+2154 and the QPO in *** can also explain the observed wide energy range of repeating FRBs in a narrow bandwidth.

关键词： periodic field narrow

A repeating fast radio burst with rapidly evolving rotation measure

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2022年第15期67卷 1517-1518页

作者： zigao dai Department of Astronomy University of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China

Fast radio bursts(FRBs)are millisecond-duration flashes of Giga-Hertz radio *** Lorimer and his collaborators[1]claimed their discovery in 2007,FRBs have remained one of the hottest fields in *** this research field,the physical origin,radiation mechanism and ambient environment are three of the key questions that have been unsolved[2,3].

关键词：旋转量 ambient emission.

The prompt phase mechanism of gamma-ray bursts

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第1期16卷 89-89页

作者： zigao dai School of Astronomy and Space Science Nanjing UniversityNanjing 210023China

Gamma-ray bursts(GRBs)are flashes of ganima-rays occurring at cosmological distances(for a recent review see^([1])).They are divided into two classes based on their prompt emission durations:short-duration(2 seconds).The observations(including discoveries of both the gravitational wave event GW170817 from an inspiral of two neutron stars and its electromagnetic counterparts)indicate that long-duration GRBs result from core collapses of massive stars and short-duration GRBs are produced from mergers of neutron star-neutron star binaries or black hole-neutron star binaries.

关键词： mechanism phase prompt

在线全文

学校读者我要写书评

暂无评论

引力波事件GW170817的电磁对应体

中国科学：物理学、力学、天文学 2018年第7期48卷 2-21页

作者：耿金军肖笛王善钦戴子高南京大学天文与空间科学学院南京210046 南京大学教育部现代天文与天体物理重点实验室南京210046 Department of Astronomy University of CaliforniaBerkeley 94720-3411USA

2017年8月17日,激光干涉引力波天文台(LIGO)首次探测到来自双中子星合并的引力波GW170817.伴随GW170817的短伽玛射线暴与千新星也分别在1.74 s后和10.9 h后被伽玛射线卫星和光学望远镜探测到.对这些电磁对应体的观测与研究首次证实双中... 详细信息

2017年8月17日,激光干涉引力波天文台(LIGO)首次探测到来自双中子星合并的引力波GW170817.伴随GW170817的短伽玛射线暴与千新星也分别在1.74 s后和10.9 h后被伽玛射线卫星和光学望远镜探测到.对这些电磁对应体的观测与研究首次证实双中子星并合会产生大量重元素并形成千新星.通过相关理论与观测的比较,人们对于双中子星并合的中心引擎、短伽玛暴喷流的特性以及并合产生的抛射物性质等一系列重要的天体物理学问题进行了空前深入的研究.本文介绍伴随GW170817的各类电磁波对应体的性质,并探讨这些电磁波对应体的物理起源.

关键词：伽玛射线暴黑洞中子星辐射机制引力波

在线全文

学校读者我要写书评

暂无评论

伽马射线暴

科学观察 2020年第3期15卷 29-32页

作者：戴子高南京大学天文与空间科学学院南京210093

伽马射线暴(简称伽马暴)是起源于大质量恒星坍缩(长伽马暴)或者致密双星并合(短伽马暴)等短时标极端剧烈的高能灾变天体,是宇宙大爆炸之后最猛烈的爆发现象,也是宇宙宏观速度最快的天体。伽马暴本身辐射及其余辉辐射来自新生黑洞或者磁... 详细信息

伽马射线暴(简称伽马暴)是起源于大质量恒星坍缩(长伽马暴)或者致密双星并合(短伽马暴)等短时标极端剧烈的高能灾变天体,是宇宙大爆炸之后最猛烈的爆发现象,也是宇宙宏观速度最快的天体。伽马暴本身辐射及其余辉辐射来自新生黑洞或者磁星所驱动的极端相对论喷流,并且理论上预期其还伴随强引力波、高能中微子和高能宇宙线辐射。因此,伽马暴是研究黑洞(或者磁星)物理、粒子物理、相对论物理、高能宇宙线物理.

关键词：引力波宇宙线宇宙大爆炸粒子物理相对论高能中微子磁星黑洞

在线全文

学校读者我要写书评

暂无评论

伽玛暴宇宙学(英文)

伽玛暴宇宙学(英文)

中国天文学会高能分会2004年学术年会

作者： dai zigao Nanjing University Collaborators: Liang En-Wei and Xu Dong

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

γ射线暴研究概况

天文学进展 2003年第4期21卷 334-369页

作者：黎卓戴子高陆埮南京大学天文学系南京210093

γ射线暴(简称γ暴)的研究自1997年以来由于余辉的发现而有了很大的突破。在此,对γ暴的观测作了简要的概述,而对γ暴的理论进展和存在问题进行了较为全面的评述,内容包括γ暴本身、余辉、能源机制、寄主星系、暴周环境、高能粒子和引... 详细信息

γ射线暴(简称γ暴)的研究自1997年以来由于余辉的发现而有了很大的突破。在此,对γ暴的观测作了简要的概述,而对γ暴的理论进展和存在问题进行了较为全面的评述,内容包括γ暴本身、余辉、能源机制、寄主星系、暴周环境、高能粒子和引力波辐射、宇宙学意义等。

关键词：天体物理学 γ射线暴综述相对论辐射机制超新星粒子物理

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A,Antarctica

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第21期62卷 1433-1438页

作者： lei hu xuefeng wu igor andreoni michael c.b.ashley jeff cooke xiangqun cui fujia du zigao dai bozhong gu yi hu haiping lu xiaoyan li zhengyang li ensi liang liangduan liu bin ma zhaohui shang tianrui sun n.b.suntzeff charling tao syed a.uddin lifan wang xiaofeng wang haikun wen di xiao jin xu ji yang shihai yang xiangyan yuan hongyan zhou hui zhang jilin zhou zonghong zhu purple mountain observatory chinese academy of sciencesNanjing 210008China chinese center for antarctic astronomy Nanjing 210008China school of astronomy and space sciences university of science and technology of chinaHefei 230029China centre for astrophysics and supercomputing swinburne university of technologyHawthornVIC3122Australia the australian research council centre of excellence for gravitational wave discovery(ozgrav) Australia australian astronomical observatory north rydensw 2113Australia school of physics university of new south walesnsw 2052Australia the australian research council centre of excellence for all-sky astrophysics(caastro) Australia nanjing institute of astronomical optics and technology nanjing 210042China school of astronomy and space science and key laboratory of modern astronomy and astrophysics in ministry of education nanjing universitynanjing 210093China national astronomical observatories chinese academy of sciencesBeijing 100012China department of physics tianjin normal universitytianjin 300074china shanghai key laboratory for astrophysics shanghai normal universityshanghai 200234China george p.and cynthia woods mitchell institute for fundamental physics&astronomy texas a.&m.universitydepartment of physics and astronomy4242 tamucollege stationTX 77843USA aix marseille univ CNRS/N2P3CPPMmarseilleFrance physics department and tsinghua center for astrophysics(thca) tsinghua universityBeijing 100084China polar research institute of china shanghai 200136china department of astronomy beijing normal universitybeijing 100875china school of physics and technology wuhan universitywuhan 430072china

The LIGO detection of gravitational waves(GW) from merging black holes in 2015 marked the beginning of a new era in observational astronomy. The detection of an electromagnetic signal from a GW source is the critical next step to explore in detail the physics involved. The Antarctic Survey Telescopes(AST3),located at Dome A, Antarctica, is uniquely situated for rapid response time-domain astronomy with its continuous night-time coverage during the austral winter. We report optical observations of the GW source(GW 170817) in the nearby galaxy NGC 4993 using AST3. The data show a rapidly fading transient at around 1 day after the GW trigger, with the i-band magnitude declining from 17:23 ± 0:13 magnitude to 17:72 ± 0:09 magnitude in ~1:8 h. The brightness and time evolution of the optical transient associated with GW 170817 are broadly consistent with the predictions of models involving merging binary neutron stars. We infer from our data that the merging process ejected about ~10^(-2) solar mass of radioactive material at a speed of up to 30% the speed of light.

关键词： Gravitational waves Binary neutron stars Gamma-ray bursts