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Polarization of gamma-ray burst afterglows in the synchrotron self-Compton process from a highly relativistic jet

Chinese Physics C 2017年第4期41卷 108-116页

作者：林海南李昕常哲 Department of Physics Chongqing University State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

Linear polarization has been observed in both the prompt phase and afterglow of some bright gamma-ray bursts（GRBs）.Polarization in the prompt phase spans a wide range,and may be as high as 50%.In the afterglow phase,however,it is usually below 10%.According to the standard fireball model,GRBs are produced by synchrotron radiation and Compton scattering process in a highly relativistic jet ejected from the central *** is widely accepted that prompt emissions occur in the internal shock when shells with different velocities collide with each other,and the magnetic field advected by the jet from the central engine can be ordered on a large *** the other hand,afterglows are often assumed to occur in the external shock when the jet collides with interstellar medium,and the magnetic field produced by the shock through,for example,Weibel instability,is possibly *** this paper,we calculate the polarization properties of the synchrotron self-Compton process from a highly relativistic jet,in which the magnetic field is randomly distributed in the shock *** also consider the generalized situation where a uniform magnetic component perpendicular to the shock plane is superposed on the random magnetic *** show that it is difficult for the polarization to be larger than 10% if the seed electrons are isotropic in the jet *** may account for the observed upper limit of polarization in the afterglow phase of *** addition,if the random and uniform magnetic components decay with time at different speeds,then the polarization angle may change 90° during the temporal evolution.

关键词： gamma-ray burst polarization synchrotron radiation Compton scattering

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The technology for detection of gamma-ray burst with GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 12-25页

作者： X.Q.Li X.Y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao K.Gong D.Y.Guo J.J.He D.J.Hou Y.G.Li C.Y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.Liu Y.Q.Liu F.J.Lu H.Lu B.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang Y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong Y.B.Xu Y.P.Xu S.Yang J.W.Yang Q.B.Yi D.L.Zhang Fan Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang X.Y.Zhao Y.Zhao X.Zhou C.S.Zhang J.P.Yu L.Chang K.K.Zhang J.Huang Y.M.Chen X.B.Han Institute of High Energy Physics CASBeijing 100049China Xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China Beijing Glass Research Institute Beijing 101100China Innovation Academy for Microsatellites of CAS Shanghai 201204China

Introduction The main physical objective of the GECAM satellite is to detect gamma-ray bursts,which is related to gravitational waves of double compact object *** GECAM satellite also detects and investigates various bursts of high-energy celestial *** and methods In this study,we designed,developed and calibrated the payload and launched it into orbit with GECAM *** payload consists of the gamma ray detector(GRD,for detecting 4 keV–4 MeV X/γray),the charged particle detector(CPD,for detecting 150 keV–5 MeV charged particle),and the electronic box(EBOX).The all-sky field coverage is achieved via two 229-degree large-area satellites positioned 180 degrees apart and are on opposite sides of the *** satellite is equipped with 25 GRDs and 8 CPDs;thus,the satellite can identify charged particle bursts in ***-ray detectors adopt lanthanum bromide crystal technology combined with silicon *** is the first time that this technology was used massively in space *** The GECAM satellite can quickly determine the direction of gamma-ray bursts(positioning)via indexing and fitting method,while the transmit variability,energy spectrum and direction of the gamma-ray bursts guide subsequent observations through the Beidou-3 RDSS in quasi-real *** will play an important role in the study of high energy celestial bursts.

关键词： GECAM gamma-ray burst Lanthanum bromide crystal Silicon photomultiplier Beidou short message

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A Comparative Study of the Power-law Relationship between the Pulse width and Energy of Precursor and Main burst

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Research in Astronomy and Astrophysics 2024年第3期24卷 144-168页

作者： Hui-Ying Deng Zhao-Yang Peng Jia-Ming Chen Dan Zhu College of Physics and Electronic Information Yunnan Normal UniversityKunming 650500China

In gamma-ray burst prompt emission,there is still no consistent conclusion if the precursor and main burst share the same *** this paper,we try to study this issue based on the relationship between pulse width and energy of the precursor and main *** systematically search the light curve data observed by Swift/BAT and Fermi/GBM,and find 13 long bursts with well-structured precursors and main *** fitting the precursor light curve of each different energy channel with the Norris function,we find that there is not only a power-law relationship between precursor width and energy,but also a power-law relationship between the ratio of the rising width to the decaying width and *** comparing the relationship between the precursors and the main burst pulses,we find that the distribution of the precursors and the relationship between the power-law indices are roughly the same as those of the main *** addition,it is found that the precursor width distribution as well as the upper limit of the pulse width ratio does not exceed 1 and both are asymmetric,which are also consistent with the main *** indicate that the precursor and the main burst are indistinguishable,and the precursor and the main burst may have the same physical origin.

关键词： methods data analysis-(stars) gamma-ray burst general-shock waves

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Rotating Massive Strangeon Stars and X-ray Plateau of Short GRBs

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Research in Astronomy and Astrophysics 2024年第3期24卷 47-57页

作者： Xi-Yan Yang Xiao-Yu Lai Wei-Wei Tan Ren-Xin Xu School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China Research Center for Astronomy Hubei University of EducationWuhan 4300205China Key Laboratory of Quark and Lepton Physics Central China Normal UniversityMinistry of EducationWuhan 430079China School of Physics Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Strangeon stars,which are proposed to describe the nature of pulsar-like compact stars,have passed various observational *** maximum mass of a non-rotating strangeon star could be high,which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon *** study rigidly rotating strangeon stars in the slowly rotating approximation,using the Lennard-Jones model for the equation of *** can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers,enlarging the mass-range of long-lived strangeon *** spin-down after merger,the decrease of radius of the remnant will lead to the release of gravitational *** into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity,we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray *** fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.

关键词： dense matter-(stars) pulsars general-(stars) gamma-ray burst general

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Progress on SVOM Satellite Development

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空间科学学报 2024年第4期44卷 690-691页

作者： WEI Jianyan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101

SVOM(Space-based multiband Variable Object Monitor)is a Chinese-French space mission mainly designed to study gamma-ray *** satellite carries four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in soft X-rays,and a VHF communication system enables the fast transmission of SVOM alerts to the *** ground segment includes an array of wide-angle cameras and two follow-up *** was launched into an orbit of about 635 km on 22 June 2024,with three years of nominal operations and an extension of two years.

关键词： Space astronomy gamma-ray burst

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The correlations among variability,optical peak time and spectral time lag of long gamma-ray bursts

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Research in Astronomy and Astrophysics 2020年第11期20卷 205-212页

作者： Bin Liao Yuan-Chuan Zou Fei-Fei Wang Yu Liu Wei-Hua Lei School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266061China

Statistical relations are useful tools to comprehend the intrinsic physics processes of gamma-ray bursts(GRBs). In this work we collect spectral lag(τ), variability(V) and optical peak time(tp,o). We find that there is a correlation between variabilities and spectral lags, reading as V =-0.0075(±0.0007) ×log10τ +0.0351(±0.0024). There may also exist a relatively weak positive tendency between GRBs optical band peak times and their spectral time lags. Its Pearson coefficient is 0.398, which indicates a weak linear correlation. If we contain some "negative spectral lag" samples, then the latter relation would be worse due to two outlying points. The τ-V relation is consistent with previous studies, and the positive trend betweenτ and tp,oindicates the spectral lag of GRB might be caused by the curvature effect, but this conclusion is not significant.

关键词： gamma-ray burst general methods statistical

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Self-organized criticality in multi-pulse gamma-ray bursts

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Frontiers of physics 2021年第1期16卷 91-98页

作者： Fen Lyu Ya-Ping Li Shu-Jin Hou Jun-Jie Wei Jin-Jun Geng Xue-Feng Wu Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China University of Chinese Academy of Sciences Beijing 100049China Theoretical Division Los Alamos National LaboratoryLos AlamosNM 87545USA College of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Institute of Astronomy and Astrophysics University of TubingenAuf der Morgenstelle 10D-72076TubingenGermany

The variability in multi-pulse gamma-ray bursts(GRBs)may help to reveal the mechanism of underlying processes from the central *** investigate whether the self-organized criticality(SOC)phenomena exist in the prompt phase of GRBs,we statistically study the proper ties of GRBs with more than 3 pulses in each burst by fitting the distributions of several observed physical variables with a Markov Chain Monte Carlo approach,including the isotropic energy E_(iso),the duration time T,and the peak count rate P of each *** sample consists of 454 pulses in 93 GRBs observed by the CGRO/BATSE *** best-fitting values and uncertainties for these power-law indices of the differential frequency distributions are:α_(E)^(d)=1.54±0.09,α_(T)^(d)=1.82_(-0.15)^(+0.14)andα_(P)^(d)=2.09_(-0.19)^(0.18),while the power-law indices in the cumulative frequency distributions are:α_(E)^(c)=1.44_(-0.10)^(+0.08),α_(T)^(c)=1.75_(-0.13)^(0.11)andα_(P)^(c)=1.99_(-0.19)^(+0.16).We find that these distributions are roughly consistent with the physical framework of a Fractal-Diffusive,Self^Organized Criticality(FD-SOC)system with the spatial dimension S=3 and the classical diffusionβ=*** results support that the jet responsible for the GRBs should be magnetically dominated and magnetic instabilities(e.g.,kink model,or tearing-model instability)lead the GRB emission region into the SOC state.

关键词： gamma-ray burst general methods statistical

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Gravitational Collapse of a Spherical Star with Heat Flow as a Possible Energy Mechanism of gamma-ray bursts

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Communications in Theoretical Physics 2008年第7期50卷 271-274页

作者： CHANG Zhe GUAN Cheng-Bo HUANG Chao-Guang LI Xin Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China Department of Physics Weihai Branch of Shandong University Weihai 264209 China

We investigate the gravitational collapse of a spherically symmetric, inhomogeneous star, which is described by a perfect fluid with heat flow and satisfies the equation of state p = p/3 at its center. In the process of the gravitational collapse, the energy of the whole star is emitted into space. And the remaining spacetime is a Minkowski one without a remnant at the end of the process. For a star with a solar mass and solar radius, the total energy emitted is at the order of 10^54 erg, and the time-scale of the process is about 8 s. These are in the typical values for a gamma-ray burst. Thus, we suggest the gravitational collapse of a spherical star with heat flow as a possible energy mechanism of gamma-ray bursts.

关键词： gravitational collapse gamma-ray burst

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gamma-ray bursts and Fermi Bubbles

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Journal of High Energy Physics, Gravitation and Cosmology 2023年第2期9卷 496-498页

作者： Kenneth Dalton Th. Pongprasart Bang Saphan Prachuap Kiri Khan Thailand

According to a recent calculation, 1058 erg of radiant energy was released by Sgr A*, when it formed the Fermi bubbles. Here, it is argued that this explosion constituted a long gamma-ray burst. .

关键词： gamma-ray burst Supermassive Black Hole

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The possible electromagnetic counterparts of the first high-probability NSBH merger LIGO/Virgo S190814bv

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Communications in Theoretical Physics 2020年第6期72卷 89-96页

作者： Hao Wei Minzi Feng School of Physics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

LIGO/Virgo S190814 bv is the first high-probability neutron star–black hole(NSBH)merger candidate,whose gravitational waves(GWs)triggered LIGO/Virgo detectors at21:10:39.012957 UT,14 August *** has a probability>99%of being an NSBH merger,with a low false alarm rate(FAR)of one per 1.559 e+25 *** an NSBH merger,electromagnetic counterparts(especially short gamma-ray bursts(GRBs))are generally ***,no electromagnetic counterpart has been found in the extensive follow-up observing *** the present work,we propose a novel explanation for this null *** our scenario,LIGO/Virgo S190814 bv is just a GW mirror image of the real NSBH merger which should have been detected before 14 September 2015,but at that time we had no ability to detect its GW *** electromagnetic counterparts associated with the real NSBH merger should be found in the archive data before 14 September *** this work,we indeed find nine short GRBs that are possibly electromagnetic counterparts.

关键词： gravitational wave electromagnetic counterpart gamma-ray burst neutron star black hole mirror image

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