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55条，第1-10条 帮助

条数/页： 排序方式：
FAST Observations of an Extremely Active Episode of FRB 20201124A. II. Energy Distribution 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2022, 卷号: 22, 期号: 12, 页码: 11
作者:  Zhang, Yong-Kun;  Wang, Pei;  Feng, Yi;  Zhang, Bing;  Li, Di
  |  收藏  |  浏览/下载：44/0  |  提交时间：2023/03/01
High energy Millihertz quasi-periodic oscillations in 1A 0535+262 with Insight-HXMT challenge current models 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2022, 卷号: 517, 期号: 2, 页码: 1988-1999
作者:  HXMT
  |  收藏  |  浏览/下载：7/0  |  提交时间：2023/11/09
Convective Overshooting in the Envelopes of A-type Stars Using the k-omega Model 期刊论文  OAI收割
The Astrophysical Journal, 2021, 卷号: 910, 期号: 1, 页码: 10
作者:  Guo F(郭飞);  Li Y(李焱)
  |  收藏  |  浏览/下载：28/0  |  提交时间：2021/04/19
Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2021
作者:  HXMT
  |  收藏  |  浏览/下载：52/0  |  提交时间：2022/02/08
black hole physics  Low Mass X-ray Binaries  accretion  accretion  discs  stars: individual (MAXI J1820+070)  Astrophysics - High Energy  Astrophysical Phenomena  Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other  we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.  
Flare Properties of A-type Stars in Kepler Data 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2020, 卷号: 905, 期号: 2, 页码: 110
作者:  Bai, Jian-Ying;  Esamdin, Ali
  |  收藏  |  浏览/下载：18/0  |  提交时间：2021/04/01
NH3 (1,1) hyperfine intensity anomalies in the Orion A molecular cloud 期刊论文  OAI收割
ASTRONOMY & ASTROPHYSICS, 2020, 卷号: 640, 页码: 114
作者:  Zhou, Dong-dong;  Wu, Gang;  Esimbek, Jarken;  Henkel, Christian;  Zhou, Jian-jun
  |  收藏  |  浏览/下载：31/0  |  提交时间：2021/04/01
Seeds of Life in Space (SOLIS) VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A 期刊论文  OAI收割
ASTRONOMY & ASTROPHYSICS, 2020, 卷号: 637, 页码: 20
作者:  Taquet, V;  Codella, C.;  De Simone, M.;  Lopez-Sepulcre, A.;  Pineda, J. E.
  |  收藏  |  浏览/下载：23/0  |  提交时间：2021/12/06
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：54/0  |  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 New Luminous Blue Variable in the Outskirts of the Andromeda Galaxy 期刊论文  OAI收割
The Astrophysical Journal Letters, 2019, 卷号: 884, 期号: 1
作者:  Huang, Y.;  Zhang, H.-W.;  Wang, C.;  Chen, B.-Q.;  Zhang YW(张杨威)
  |  收藏  |  浏览/下载：120/0  |  提交时间：2019/11/25