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浏览/检索结果: 共34条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Optimization of performance of the KM2A full array using the Crab Nebula 期刊论文  OAI收割 CHINESE PHYSICS C, 2024, 卷号: 48, 期号: 6 作者:  Cao, Zhen;  Aharonian, F.;  An, Q.;  Axikegu;  Bai, Y.X.   |  收藏  |  浏览/下载：23/0  |  提交时间：2024/06/11 gamma-ray  Crab Nebula  significance   Enstatite chondrites: condensation and metamorphism under extremely reducing conditions and contributions to the Earth 期刊论文  OAI收割 Progress in Earth and Planetary Science, 2022, 卷号: 9, 期号: 1 作者:  Lin,Yangting   |  收藏  |  浏览/下载：57/0  |  提交时间：2022/07/01 Enstatite chondrite  Condensation of the solar nebula  Reducing conditions  Inner solar system  Building blocks of the Earth   Detection of strong scattering close to the eclipse region of PSR B1957+20 期刊论文  OAI收割 Monthly Notices of the Royal Astronomical Society, 2022, 卷号: 513, 期号: 2, 页码: 1794-1800 作者:  Bai, J. T.;  Dai, S.;  Zhi, Q. J.;  Coles, W. A.   |  收藏  |  浏览/下载：15/0  |  提交时间：2023/06/19 scattering  binaries: eclipsing  pulsars: general  pulsars: individual:  PSR B1957+20  millisecond pulsar  orbital evolution  giant pulses  solar-wind  binary  discovery  scintillation  propagation  variability  nebula  Astronomy & Astrophysics   Performance of LHAASO-WCDA and observation of the Crab Nebula as a standard candle 期刊论文  OAI收割 CHINESE PHYSICS C, 2021, 卷号: 45, 期号: 8 作者:  Aharonian, F.;  An, Q.;  Axikegu;  Bai, L.X.;  Bai, Y.X.   |  收藏  |  浏览/下载：98/0  |  提交时间：2022/01/17 LHAASO-WCDA  Crab Nebula  angular resolution  spectral energy distribution   Observation of the Crab Nebula with LHAASO-KM2A-a performance study 期刊论文  OAI收割 CHINESE PHYSICS C, 2021, 卷号: 45, 期号: 2, 页码: 13 作者:  Aharonian, F.;  An, Q.;  Axikegu;  Bai, L. X.;  Bai, Y. X.   |  收藏  |  浏览/下载：34/0  |  提交时间：2021/03/08 gamma-ray  Crab Nebula  extensive air showers  cosmic rays   Origin of Al-rich chondrules in CV chondrites: Incorporation of diverse refractory components into the ferromagnesian chondrule-forming region 期刊论文  OAI收割 GEOCHIMICA ET COSMOCHIMICA ACTA, 2020, 卷号: 272, 页码: 198-217 作者:  Zhang, Mingming;  Lin, Yangting;  Tang, Guoqiang;  Liu, Yu;  Leya, Ingo   |  收藏  |  浏览/下载：19/0  |  提交时间：2020/05/18 Al-rich chondrules  Ca-, Al-rich inclusions  Solar nebula  Oxygen isotopes  Rare earth elements   The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文  OAI收割 Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870 作者:  HXMT   |  收藏  |  浏览/下载：56/0  |  提交时间：2022/02/08 stars: magnetic field  stars: neutron  pulsars: general  Astrophysics  - High Energy Astrophysical Phenomena  Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.   Two-zone Diffusion of Electrons and Positrons from Geminga Explains the Positron Anomaly 期刊论文  OAI收割 ASTROPHYSICAL JOURNAL, 2018, 卷号: 863, 期号: 1, 页码: 6 作者:  Fang, Kun;  Bi, Xiao-Jun;  Yin, Peng-Fei;  Yuan, Qiang   |  收藏  |  浏览/下载：36/0  |  提交时间：2019/04/08 cosmic rays  ISM: individual objects (Geminga nebula)  pulsars: individual (Geminga)   Two-zone Diffusion of Electrons and Positrons from Geminga Explains the Positron Anomaly 期刊论文  OAI收割 ASTROPHYSICAL JOURNAL, 2018, 卷号: 863, 期号: 1, 页码: 30 作者:  Yin, PF;  Bi, XJ;  Fang, K;  Yin PF(殷鹏飞);  Bi XJ(毕效军)   |  收藏  |  浏览/下载：147/0  |  提交时间：2019/09/24 cosmic rays  ISM: individual objects (Geminga nebula)  pulsars: individual (Geminga)   Bow-shock pulsar-wind nebulae passing through density discontinuities 期刊论文  OAI收割 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 卷号: 464, 期号: 3, 页码: 3297-3308 作者:  Yoon, Doosoo;  Heinz, Sebastian   |  收藏  |  浏览/下载：31/0  |  提交时间：2019/05/23 Pulsars: General  Stars: Winds, Outflows  Ism: Individual Objects: Guitar Nebula  Ism: Kinematics And Dynamics