中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
机构
采集方式
内容类型
发表日期
学科主题
筛选

浏览/检索结果: 共29条，第1-10条 帮助

条数/页： 排序方式：
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.  
Insight-HXMT observations of Swift J0243.6+6124: the evolution of RMS pulse fractions at super-Eddington luminosity 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 497, 页码: 5498-5506
作者:  HXMT
  |  收藏  |  浏览/下载：44/0  |  提交时间：2022/02/08
stars: neutron  pulsars: individual: Swift J0243.6+6124  X-rays:  binaries  Astrophysics - High Energy Astrophysical Phenomena  Abstract: Based on Insight-HXMT data, we report on the pulse fraction evolution during the 2017-2018 outburst of the newly discovered first Galactic ultraluminous X-ray (ULX) source Swift J0243.6+6124. The pulse fractions of 19 observation pairs selected in the rising and fading phases with similar luminosity are investigated. The results show a general trend of the pulse fraction increasing with luminosity and energy at supercritical luminosity. However, the relative strength of the pulsation between each pair evolves strongly with luminosity. The pulse fraction in the rising phase is larger at luminosity below 7.71 × 1038 erg s-1, but smaller at above. A transition luminosity is found to be energy independent. Such a phenomenon is first confirmed by Insight-HXMT observations and we speculate that it may have relation with the radiation-pressure-dominated accretion disc.  
A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2019, 卷号: 485, 期号: 4, 页码: 5294-5318
作者:  Pandey, S. B.;  Hu, Y.
  |  收藏  |  浏览/下载：31/0  |  提交时间：2022/06/01
In-orbit Demonstration of X-Ray Pulsar Navigation with the Insight-HXMT Satellite 期刊论文  OAI收割
The Astrophysical Journal Supplement Series, 2019, 卷号: 244, 页码: 1
作者:  HXMT
  |  收藏  |  浏览/下载：15/0  |  提交时间：2022/02/08
pulsars: general  techniques: miscellaneous  Astrophysics -  Instrumentation and Methods for Astrophysics  Abstract: In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard X-ray Modulation Telescope (Insight-HXMT) Satellite, which was launched on 2017 June 15. The new pulsar navigation method Significance Enhancement of Pulse-profile with Orbit-dynamics is adopted to determine the orbit with observations of only one pulsar. In this test, the Crab pulsar is chosen and observed by Insight-HXMT from 2017 August 31 to September 5. Using the five-day long observation data, the orbit of Insight-HXMT is determined successfully with the three telescopes onboard: High Energy X-ray Telescope, Medium Energy X-ray Telescope, and Low Energy X-ray Telescope, respectively. By combining all the data, the position and velocity of the Insight-HXMT are pinpointed to within 10 km (3ҩ and 10 m s-1 (3ҩ, respectively.  
Central-engine-powered Bright X-Ray Flares in Short Gamma-Ray Bursts: A Hint of a Black Hole-Neutron Star Merger? 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2018, 卷号: 858, 期号: 1
作者:  Mu, Hui-Jun;  Gu, Wei-Min;  Mao JR(毛基荣);  Hou, Shu-Jin;  Lin, Da-Bin
  |  收藏  |  浏览/下载：43/0  |  提交时间：2018/07/03
A small electron beam ion trap/source facility for electron/neutral-ion collisional spectroscopy in astrophysical plasmas 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2018, 卷号: 18, 页码: 1
作者:  Zhao, Gang;  Ma, Xin-Wen;  Zschornack, Guenter;  Schmidt, Mike;  Zhu, Xiao-Long
  |  收藏  |  浏览/下载：28/0  |  提交时间：2018/05/31
A small electron beam ion trap/source facility for electron/neutral-ion collisional spectroscopy in astrophysical plasmas 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2018, 卷号: 18, 期号: 1, 页码: 10
作者:  Liang, Gui-Yun;  Wei, Hui-Gang;  Yuan, Da-Wei;  Wang, Fei-Lu;  Peng, Ji-Min
  |  收藏  |  浏览/下载：16/0  |  提交时间：2020/03/11
The pc-scale radio structure of MIR-observed radio galaxies 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2018, 卷号: 18, 期号: 9
作者:  Yuan Ye;  Gu MinFong;  Chen YongJun
  |  收藏  |  浏览/下载：14/0  |  提交时间：2021/12/06
ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2016, 卷号: 818, 期号: 2
作者:  Wang, Yuan-Zhu;  Zhao, Yinan;  Shao, Lang;  Liang, En-Wei;  Lu, Zu-Jia
收藏  |  浏览/下载：24/0  |  提交时间：2016/09/27
SPECTRAL SOFTENING IN THE X-RAY AFTERGLOW OF GRB 130925A AS PREDICTED BY THE DUST SCATTERING MODEL 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2014, 卷号: 789, 期号: 1, 页码: 0
作者:  Zhao, Yi-Nan;  Shao, Lang
收藏  |  浏览/下载：21/0  |  提交时间：2014/11/21