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浏览/检索结果: 共40条，第1-10条 帮助

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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.  
Direct parameter inference from global EoR signal with Bayesian statistics 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 卷号: 492, 期号: 3, 页码: 4080-4096
作者:  Gu, Junhua;  Wang, Jingying
  |  收藏  |  浏览/下载：49/0  |  提交时间：2021/09/26
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.  
The Ly? Luminosity Function and Cosmic Reionization at z?7.0: A Tale of Two LAGER Fields 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2019, 卷号: 886, 期号: 2, 页码: 21
作者:  Hu, Weida;  Wang, Junxian;  Zheng, Zhen-Ya;  Malhotra, Sangeeta;  Rhoads, James E.
  |  收藏  |  浏览/下载：84/0  |  提交时间：2020/03/19
Studying high-z galaxies with [C II] intensity mapping 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 卷号: 490, 期号: 2, 页码: 1928-1943
作者:  Yue, B.;  Ferrara, A.
  |  收藏  |  浏览/下载：35/0  |  提交时间：2020/03/10
The Lyα Luminosity Function and Cosmic Reionization at z?～?7.0: A Tale of Two LAGER Fields 期刊论文  OAI收割
The Astrophysical Journal, 2019, 卷号: 886, 期号: 2
作者:  Hu,Weida;  Wang,Junxian;  Zheng,Zhen-Ya;  Malhotra,Sangeeta;  Rhoads,James E.
  |  收藏  |  浏览/下载：76/0  |  提交时间：2020/03/19
Contribution of Radio Halos to the Foreground for SKA EoR Experiments 期刊论文  OAI收割
The Astrophysical Journal, 2019, 卷号: 879, 期号: 2
作者:  Li,Weitian;  Xu,Haiguang;  Ma,Zhixian;  Hu,Dan;  Zhu,Zhenghao
  |  收藏  |  浏览/下载：33/0  |  提交时间：2020/03/10
Separating the EoR signal with a convolutional denoising autoencoder: a deep-learning-based method 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 卷号: 485, 期号: 2, 页码: 2628-2637
作者:  Li, Weitian;  Xu, Haiguang;  Ma, Zhixian;  Zhu, Ruimin;  Hu, Dan
  |  收藏  |  浏览/下载：43/0  |  提交时间：2020/03/10
The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 卷号: 483, 期号: 4, 页码: 5380-5408
作者:  Tanvir, N. R.;  Fynbo, J. P. U.;  de Ugarte Postigo, A.;  Japelj, J.;  Wiersema, K.
  |  收藏  |  浏览/下载：19/0  |  提交时间：2020/03/10
The Global 21cm Absorption from Cosmic Dawn with Inhomogeneous Gas Distribution 期刊论文  OAI收割
ASTROPHYSICAL JOURNAL, 2018, 卷号: 869, 期号: 1, 页码: 6
作者:  Xu, Yidong;  Yue, Bin;  Chen, Xuelei
  |  收藏  |  浏览/下载：21/0  |  提交时间：2020/03/10