We report the detection of type-B quasi-periodic oscillation(QPO)of the black hole X-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst.A type-B QPO was observed for the first two days and it dis...We report the detection of type-B quasi-periodic oscillation(QPO)of the black hole X-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst.A type-B QPO was observed for the first two days and it disappeared as flux increased,but again appeared at∼7.70 Hz when flux was dramatically decreased.The source was found in the soft intermediate state during these observations.We further studied the energy dependence of the QPO.We found that QPO was observed only for a higher energy range implying that the origin of QPO is possibly due to the corona emitting higher energy photons by the inverse Compton process.The variation of spectral parameters can be explained with the disk truncation model.The fractional rms was found to be monotonically increased with energy.The phase lag spectrum followed the“U-shaped”curve.The rms and phase lag spectrum are modeled and explained with the single-component Comptonization model vkompthdk.展开更多
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...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 date.We 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 luminosity.Using 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 regimes.Above 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 energies.Our result is consistent with what is derived from spectral analysis.展开更多
This study investigates the X-ray properties and evolution of Type II supernovae (SNe II) observed by Swift, examining variations among supernovae and exploring their X-ray characteristics over time. We present the fi...This study investigates the X-ray properties and evolution of Type II supernovae (SNe II) observed by Swift, examining variations among supernovae and exploring their X-ray characteristics over time. We present the first X-ray study of the Type IIp supernova SN 2008ij using data from the Swift X-ray mission. This investigation focuses on its spectral properties, identifying an X-ray flux of 1.20 (+0.11, −0.10) × 10−13 erg/cm2/s and a plasma temperature of 4.76 (+1.22, −0.83) keV. Our study marks an advancement in understanding SN 2008ij, providing crucial results into its X-ray emission characteristics. These results lay the groundwork for future studies of Type IIp supernovae, offering a foundation for exploring their evolutionary and physical processes.展开更多
Up till now only a few papers have been found to analyze the poem Verses on the Death of Dr.Swift.It is really rare seen the author himself has the poetic commentary on his own death.Some information about Swift and s...Up till now only a few papers have been found to analyze the poem Verses on the Death of Dr.Swift.It is really rare seen the author himself has the poetic commentary on his own death.Some information about Swift and some brilliant passages and the language specific in the poem Verses on the Death of Dr.Swift are expounded.Some scholarly researches of the poem in the world are also conceded.展开更多
跨境金融通信对于现代金融业务的开展极为重要.环球银行金融电信协会(SWIFT)是跨境金融通信服务的主要提供者.现阶段,报文传输是 SWIFT 系统的主要业务,确保报文传输安全、准确、高效,是 SWIFT 系统的重要目标.但现阶段基于中心架构思想...跨境金融通信对于现代金融业务的开展极为重要.环球银行金融电信协会(SWIFT)是跨境金融通信服务的主要提供者.现阶段,报文传输是 SWIFT 系统的主要业务,确保报文传输安全、准确、高效,是 SWIFT 系统的重要目标.但现阶段基于中心架构思想的 SWIFT 系统安全风险突出,传输效率低,成本较高.基于许可链分布式共识机制,提出 BCSWIFT 系统,对现有的 SWIFT 系统进行优化.首先,将 SWIFT 系统的传输网络划分为主网络层和附加网络层;其次,提出了基于双层网络结构的共识算法;第三,介绍了 BCSWIFT 系统的报文交互和传输机制;第四,出于金融业务数据商业保密考虑,提出了一种面向 BCSWIFT 系统的隐私保护机制;第五,对 BCSWIFT 系统的安全性进行了分析.以优化 SWIFT 系统的报文传输业务为例,阐释了基于许可链的跨境金融通信的基本机理,为确保跨境支付、清算、结算的安全、高效、准确和低成本化运作提供了新的思路,也为区块链技术大规模商业应用提供了重要参照.展开更多
文摘We report the detection of type-B quasi-periodic oscillation(QPO)of the black hole X-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst.A type-B QPO was observed for the first two days and it disappeared as flux increased,but again appeared at∼7.70 Hz when flux was dramatically decreased.The source was found in the soft intermediate state during these observations.We further studied the energy dependence of the QPO.We found that QPO was observed only for a higher energy range implying that the origin of QPO is possibly due to the corona emitting higher energy photons by the inverse Compton process.The variation of spectral parameters can be explained with the disk truncation model.The fractional rms was found to be monotonically increased with energy.The phase lag spectrum followed the“U-shaped”curve.The rms and phase lag spectrum are modeled and explained with the single-component Comptonization model vkompthdk.
基金project funded by China National Space Administration(CNSA)the Chinese Academy of Sciences(CAS)+2 种基金supported by the National Key R&D Program of China(2021YFA0718500 and 2023YFE0101200)from the Minister of Science and Technology of China(MOST)supports from the National Natural Science Foundation of China under grants 12373051 and 12333007supported by International Partnership Program of Chinese Academy of Sciences(grant No.113111KYSB20190020)。
文摘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 date.We 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 luminosity.Using 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 regimes.Above 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 energies.Our result is consistent with what is derived from spectral analysis.
文摘This study investigates the X-ray properties and evolution of Type II supernovae (SNe II) observed by Swift, examining variations among supernovae and exploring their X-ray characteristics over time. We present the first X-ray study of the Type IIp supernova SN 2008ij using data from the Swift X-ray mission. This investigation focuses on its spectral properties, identifying an X-ray flux of 1.20 (+0.11, −0.10) × 10−13 erg/cm2/s and a plasma temperature of 4.76 (+1.22, −0.83) keV. Our study marks an advancement in understanding SN 2008ij, providing crucial results into its X-ray emission characteristics. These results lay the groundwork for future studies of Type IIp supernovae, offering a foundation for exploring their evolutionary and physical processes.
文摘Up till now only a few papers have been found to analyze the poem Verses on the Death of Dr.Swift.It is really rare seen the author himself has the poetic commentary on his own death.Some information about Swift and some brilliant passages and the language specific in the poem Verses on the Death of Dr.Swift are expounded.Some scholarly researches of the poem in the world are also conceded.
文摘跨境金融通信对于现代金融业务的开展极为重要.环球银行金融电信协会(SWIFT)是跨境金融通信服务的主要提供者.现阶段,报文传输是 SWIFT 系统的主要业务,确保报文传输安全、准确、高效,是 SWIFT 系统的重要目标.但现阶段基于中心架构思想的 SWIFT 系统安全风险突出,传输效率低,成本较高.基于许可链分布式共识机制,提出 BCSWIFT 系统,对现有的 SWIFT 系统进行优化.首先,将 SWIFT 系统的传输网络划分为主网络层和附加网络层;其次,提出了基于双层网络结构的共识算法;第三,介绍了 BCSWIFT 系统的报文交互和传输机制;第四,出于金融业务数据商业保密考虑,提出了一种面向 BCSWIFT 系统的隐私保护机制;第五,对 BCSWIFT 系统的安全性进行了分析.以优化 SWIFT 系统的报文传输业务为例,阐释了基于许可链的跨境金融通信的基本机理,为确保跨境支付、清算、结算的安全、高效、准确和低成本化运作提供了新的思路,也为区块链技术大规模商业应用提供了重要参照.
