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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2
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Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2

机译：基于Z源GX 17 + 2的延迟的检测限制冠状高度和重新调整速度

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Neutron star Z-type sources provide a unique platform in order to understand the structure of accretion disk-corona geometry emitting close to the Eddington luminosity. Using RXTE and Nuclear Spectroscopic Telescope Array Mission (NuSTAR) satellite data, we performed crosscorrelation function (CCF) studies in GX 17+2 in order to constrain the size of the corona responsible for hard X-rays. From the RXTE data, we found that during horizontal and normal branches, the CCFs show anticorrelated hard (16-30 keV) and soft (2-5 keV) X-ray delays of the order of a few tens to hundred seconds with a mean correlation coefficient of 0.42 +/- 0.11. Few observations shows correlated lags and, on one occasion, coincident with radio emission. We also report an anticorrelated hard X-ray delay of 113 +/- 51 s using the NuSTAR data of GX 17+2. Based on RXTE data, we find that soft and hard X-ray fluxes are varying, indicating the changes in the disk-corona structure during delays. We bridle the size of the corona using relativistic precession, transition layer models, and boundary layer models. Assuming the delays to be a readjustment timescale of the disk-corona structure, the height of the corona was estimated to be similar to 17-100 km. Assuming that the inner region of the truncated disk is occupied by the corona, we constrain the coronal readjustment velocities (nu(corona) = beta nu(disk), where nu(disk) is the radial velocity component of the disk) of the order of beta = 0.06-0.12. This study indicates that the observed delays are primarily dependent on the varying coronal readjustment velocities.
机译：中子星Z型来源提供独特的平台，以了解靠近Eddington亮度的吸积盘 - 电晕几何结构。使用RXTE和核光谱望远镜阵列任务（NUSTAR）卫星数据，我们在GX 17 + 2中进行了跨相关功能（CCF）研究，以限制负责硬X射线的电晕尺寸。从RXTE数据中，我们发现，在水平和正常分支期间，CCFS显示了逆相关（16-30keV）和柔软（2-5keV）X射线延迟，百分之十几到数百秒相关系数为0.42 +/- 0.11。很少有观察结果显示相关的滞后，并且一次性地与无线电发射一致。我们还使用GX 17 + 2的NUSTAR数据报告了113 +/- 51秒的逆相关硬X射线延迟。基于RXTE数据，我们发现柔软和硬的X射线通量变化，表示延迟期间磁盘 - 电晕结构的变化。我们使用相对论的进程，过渡层模型和边界层模型来串行电晕的大小。假设延迟是磁盘 - 电晕结构的重新调整时间尺度，估计电晕的高度与17-100公里类似。假设截断磁盘的内部区域被电晕占用，我们约束了冠状重型速度（Nu（Corona）= Beta Nu（磁盘），其中Nu（磁盘）是磁盘的径向速度分量）的顺序β= 0.06-0.12。该研究表明观察到的延迟主要取决于不同的冠状重型速度。

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