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Polarization Study of Swift J151857.0–572147 with IXPE Observation

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Research in Astronomy and Astrophysics 2024年第9期24卷 60-65页

作者： yu-Shan Ling Fei Xie ming-yu ge Fabio La Monaca Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China INAF Istituto di Astrofisica e Planetologia Spaziali Via del Fosso del Cavaliere 10000133 RomaItaly Dipartimento di Fisica Universitàdegli Studi di Roma“Tor Vergata”Via della Ricerca Scientifica 100133 RomaItaly Dipartimento di Fisica Universitàdegli Studi di Roma“La Sapienza”Piazzale Aldo Moro 500185 RomaItaly

We present an analysis of the Imaging X-ray Polarimetry Explorer observation from a newly discovered transient source:Swift *** obtained polarization degree(PD)and angle are 0.3%±0.3% and -24°±26°respectively in 2-8 keV within 68%confidence level errors,and polarization results are below MDP99in all energy bins,with the upper limit on PD of 0.8% in the 2-8 keV energy *** quasi-periodic oscillations(QPOs)are detected in this *** polarization and QPO analyses support the hypothesis that the source was in the high soft state,and the results are consistent with predictions for a thin accretion disk model.

关键词： stars:black holes polarization X-rays:bursts

Insight-HXMT observations of the Crab pulsar

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Research in Astronomy and Astrophysics 2019年第6期19卷 109-116页

作者： You-Li Tuo ming-yu ge Li-ming Song Lin-Li Yan Qing-Cui Bu Jin-Lu Qu Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China University of the Chinese Academy of Sciences Beijing 100049 China School of Mathematics and Physics Anhui Jianzhu University Hefei 230601 China

We report on X-ray emission properties of the Crab pulsar(PSR B0531+21) using observations by Insight-HXMT during its first year after launch. We obtained high signal-to-noise profiles in the X-ray energy band 11–250 keV. We have confirmed an increase in the flux ratio of the second peak over the main peak with increasing energy, consistent with other missions. The separation of the two peaks shows no significant trend with increasing energy. The phase-averaged spectrum, fitted by a logpar model, and the phase-resolved spectra of the Crab pulsar, fitted by a powerlaw in the different energy bands of HXMT, are consistent with RXTE and NuSTAR in that photon indices evolve as a function of phase as well as a function of energy, contributing to a broadband modeling.

关键词： stars neutron star-pulsars individual(Crab)-X-rays

The Time and Energy Dependence of the Vela Pulsar's Pulse Profile inγ-Ray

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Research in Astronomy and Astrophysics 2022年第4期22卷 128-136页

作者： Lin-Li Yan ming-yu ge You-Li Tuo Ling-jun Wang Qing-yong Zhou School of Mathematics and Physics Anhui Jianzhu UniversityHefeiAnhui 230601China Key Laboratory of Architectural Acoustics Environment of Anhui High Education Institutes HefeiAnhui 230601China Key Laboratory of Advanced Electronic Materials and Devices Anhui Jianzhu UniversityHefeiAnhui 230601China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of geographic Information Engineering Xi'an Institute of Surveying and MappingXi'an 710054China

We analyze the time and energy dependence of the Vela pulsar’s pulse profile using 13 yr observations from the Large Area Telescope on the Fermi Gamma-ray Space *** is found that the pulse profile of the Vela pulsar inγ-ray changes with *** parameterize the pulse profile and find that different shape parameters show fiuctuations rather than gradual changes with ***,these time variation trends are insignificant due to limited *** pulse profile of the Vela pulsar displays clear energy dependence inγ-*** shape parameters are accurately obtained or updated,especially the phase separations among different *** energy evolution trends are quantified for the first time,which will provide restrictions on currentγ-ray emission *** the Vela pulsar,we also find a turning point at *** and after this phase,the relative intensity of the pulse profile evolves with energy with the opposite trend.

关键词： stars:neutron (stars:)pulsars:individual(Vela) gamma-rays:stars Pulsars(1306) Gamma-ray sources(633)

Temporal and Spectral Characteristics of Persistent Emission and Special Bursts of Magnetar SGR J1935+2154 Based on Insight-HXMT

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Research in Astronomy and Astrophysics 2024年第6期24卷 225-233页

作者： Xue-Feng Lu Li-ming Song ming-yu ge Shuang-Nan Zhang Jin-Lu Qu Ce Cai Cong-Zhan Liu Cheng-Kui Li yu-Cong Fu Ying-Chen Xu Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Department of Astronomy Beijing Normal UniversityBeijing 100875China

In October 2022,the magnetar SGR J1935+2154 entered the active outburst *** the episode,the InsightHXMT satellite carried out a long observation that lasted for 20 *** than 300 bursts were detected,and a certain amount of persistent radiation signals were also *** paper mainly introduces the results of persistent radiation profile folding and period search based on Insight-HXMT *** the same time,the burst phase distribution characteristics,spectral lag results of burst,the spectral characteristics of zero-lag bursts and the time-resolved spectral evolution characteristics of high-flux bursts are *** found that there is no significant delay feature during different energy bands for the bursts of SGR J1935+*** observed zero-lag burst does not have a unique *** time-resolved spectrum of the individual burst has consistent spectral types and spectral parameters at different time periods of the *** also find that the burst number phase distribution and the burst photon phase distribution have the same tendency to concentrate in specific regions of the persistent emission profile.

关键词： radiation mechanisms:general dense matter magnetic fields

Burst Phase Distribution of SGR J1935+2154 Based on Insight-HXMT

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Research in Astronomy and Astrophysics 2023年第3期23卷 68-74页

作者： Xue-Feng Lu Li-ming Song ming-yu ge You-Li Tuo Shuang-Nan Zhang Jin-Lu Qu Ce Cai Sheng-Lun Xie Cong-Zhan Liu Cheng-Kui Li yu-Cong Fu Ying-Chen Xu Tian-ming Li Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China Institute of Astrophysics Central China Normal UniversityWuhan 430079China

On 2020 April 27,the soft gamma-ray repeater SGR J1935+2154 entered its intense outburst episode ***-HXMT carried out about one month observation of the source.A total number of 75 bursts were detected during this activity episode by Insight-HXMT,and persistent emission data were also *** report on the spin period search result and the phase distribution of burst start times and burst photon arrival times of the Insight-HXMT high energy detectors and Fermi/Gamma-ray Burst Monitor(GBM).We find that the distribution of burst start times is uniform within its spin phase for both Insight-HXMT and Fermi/GBM observations,whereas the phase distribution of burst photons is related to the type of a burst’s energy *** bursts with the same spectrum have different distribution characteristics in the initial and decay episodes for the activity of magnetar SGR J1935+2154.

关键词： spectrum Fermi distribution

Synchronous left atrial myxoma and adenosquamous lung carcinoma

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Chinese Medical Journal 2013年第15期126卷 2992-2993页

作者： LIU Hong-cheng CHEN Xiao-feng yu yu-ming JIANG ge-ning Tongji Univ Dept Thorac Surg Shanghai Pulm Hosp Sch Med Shanghai 200433 Peoples R China

Atrial myxomas account for 40%-50% of primary cardiac tumors and as such are the most common primary heart tumors. Because prolapsing myxomas cause the intermittent obstruction of the valvular outflow tract during diastole, the signs and symptoms of left atrial myxoma resemble mitral stenosis. Myxoma may lead to systemic thromboembolic events from tumor fragmentation. In addition, lung carcinoma is a common tumor with highly heterogeneous malignancies.

关键词： left atrial myxoma lung carcinoma synchronous occurrence simultaneous resection

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

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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

In-orbit performance of HE onboard Insight-HXMT in the first 5 years

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Radiation Detection Technology and Methods 2023年第1期7卷 3-14页

作者： Xu-Fang Li Cong-Zhan Liu Yi-Fei Zhang Xiao-Bo Li Zheng-Wei Li Xue-Feng Lu Zhi Chang ming-yu ge Juan Zhang yu-Peng Xu Fang-Jun Lu Li-ming Song Shuang-Nan Zhang Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Science19B Yuquan RoadShijingshan DistrictBeijing 100049China

Purpose The high-energy X-ray telescope(HE),one of the three main payloads of the Insight-HXMT mission,is composed of eighteen NaI(Tl)/CsI(Na)phoswich detectors,where NaI(Tl)serves as the primary detector covering 20–250 keV,and CsI(Na)is used as an active shield detector to suppress the background of NaI(Tl)and also serves as an all-sky gammaray burst monitor covering 0.2–*** this paper,we review the in-orbit performance of HE in the first 5 years since Insight-HXMT was launched on June 15,*** The major performances we concern include the gain and energy resolution of NaI(Tl)and CsI(Na)detectors,the performance of pulse shape discriminator(PSD)and system dead *** this work,we investigate these performances mainly using the data of blank-sky observations and the data when the telescope is in earth *** The overall performance of HE/NaI(Tl)is very stable in the first 5 years,whereas the gain of HE/CsI(Na)shows a continuously increasing trend and should be calibrated *** In general,HE is still in good health and well-calibrated status after five-year’s *** in-orbit performance of HE has no significant deviation from *** is expected to be in operation healthily for another several years of extended mission life.

关键词： Insight-HXMT Hard X-ray telescope Scintillation detector In-orbit

Searching for the Highest Energy of Pulsation and Critical Luminosity of Swift J0243.6+6124 Observed by Insight-HXMT

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Research in Astronomy and Astrophysics 2024年第5期24卷 61-69页

作者： Qing-Xia Zhao Xian Hou ming-yu ge Shuang-Nan Zhang yun-Xiang Xiao You-Li Tuo Zi-Xu Yang Ling-Da Kong Jin-Lu Qu Shu Zhang Jian-Cheng Wang yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences ChineseAcademy of SciencesBeijing 100049China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China Institut fur Astronomic und Astrophysik Sand 1D-72076 TabingenGemany School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China

Owing to the broad energy coverage of Insight-HXMT in the hard X-ray band,we detected the highest energy of pulsation exceeding 200 keV around the 2017–2018 outburst peak of the first Galactic pulsating ultraluminous X-ray source (PULX) Swift J0243.6+6124,which is the highest energy detected from PULXs to *** also obtained the highest energy of pulsation of every exposure during the outburst in 2017–2018,and found the highest energy is roughly positively correlated with *** our newly developed method,we identified the critical luminosity being 4×10^(38)erg s^(-1) when the main peaks of the low and high energy pulse profiles became aligned,which separates the fan-beam dominated and pencil-beam dominated accretion *** the critical luminosity,the phase of the main peak shifted gradually from 0.5 to 0.8 until the outburst peak in al energy bands is reached,which is in agreement with the phase shift found previously at low *** result is consistent with what is derived from spectral analysis.

关键词： (stars:)pulsars-individual(Swift J0243.6+6124)-X-rays binaries–stars neutron