论文标题
在积聚二进制X射线PULSAR LMC X-4的持续X射线排放中发现准周期性振荡
Discovery of Quasi Periodic Oscillations in the persistent X-ray emission of Accreting Binary X-ray Pulsar LMC X-4
论文作者
论文摘要
我们报告了使用XMM-Newton的观察结果，报告了高质量X射线二元（HMXB）PULSAR LMC X-4在高质量X射线二进制（HMXB）PULSAR LMC X-4中发现的准周期振荡（QPO）的发现。除了74 MHz相干脉动外，持续的发射光曲线还显示了20-30 MHz频率范围的QPO特征。在用Rossi X射线定时资源管理器（RXTE）进行的观察中，以前从LMC X-4观察到了准周期耀斑。但是，这是在LMC X-4的持续发射观察中首次观察到QPO。通常认为X射线二进制文件中的QPO与内积盘中不均匀物质分布的旋转有关。在高质量X射线二进制文件（HMXB）中，例如LMC X-4，其中紧凑型物体是具有高磁场的中子恒星，内部吸积盘的半径由质量积聚速率和中子星的磁矩确定。在这样的系统中，QPO特征以及脉冲周期和X射线光度测量有助于我们限制中子星的磁场强度。我们使用磁层积聚的考虑因素具有LMC X-4中中子星的磁场强度的近似值。
We report the discovery of quasi-periodic oscillations (QPOs) in the High Mass X-ray Binary (HMXB) pulsar LMC X-4 in its non-flaring (persistent) state using observations with XMM-Newton. In addition to the 74 mHz coherent pulsations, the persistent emission light curve shows a QPO feature in the frequency range of 20-30 mHz. Quasi-periodic flares have been previously observed from LMC X-4 in observations made with Rossi X-ray Timing Explorer (RXTE). However, this is the first time QPOs have been observed in the persistent emission observations of LMC X-4. QPOs in X-ray binaries are generally thought to be related to the rotation of the inhomogeneous matter distribution in the inner accretion disk. In High Mass X-ray Binaries (HMXBs) such as LMC X-4 where the compact object is a neutron star with a high magnetic field, the radius of the inner accretion disk is determined by the mass accretion rate and the magnetic moment of the neutron star. In such systems, the QPO feature, along with the pulse period and X-ray luminosity measurement helps us to constrain the magnetic field strength of the neutron star. We use considerations of magnetospheric accretion to have an approximate value of the magnetic field strength of the neutron star in LMC X-4.
