论文标题
BE/X射线二进制PULSAR 3A 0726-260（4U 0728-25）的Astrosat观察
AstroSat observation of the Be/X-ray binary Pulsar 3A 0726-260 (4U 0728-25)
论文作者
论文摘要
提出了BE/X射线二进制脉冲星3A 0726-260（4U 0728-25）的定时和光谱特性的结果。 2016年5月6日至7日观察到二进制，大面积X射线比例计数器（LAXPC）和软X射线望远镜（SXT）仪器在Astrosat卫星上。在此观察期间，源处于非亮点持续状态，$ \ sim $ 8.6 $ \ pm $ 0.3 $ \ times $ 10 $^{ - 11} $ ergs cm $^{ - 2} $ sec $^{ - 2} $ sec $^{ - 1} $在0.4-20 kev中。具有103.144 $ \ pm $ $ 0.001秒的强X射线脉动在0.3-7 keV中检测到SXT的0.3-7 keV，而LAXPC则在3-40 keV中检测到3-40 kev。脉冲曲线取决于能量，并且有一个迹象表明，脉冲形状从宽的单个脉冲变为较高能量下的双重脉冲。在高于20 KEV的能量时，我们报告了脉动周期的首次检测103.145 $ \ pm $ 0.001秒和来自源的双峰脉冲轮廓。源的能量光谱来自0.4-20 KeV中SXT和LAXPC光谱数据的组合分析。最佳光谱拟合是由具有光子指数（1.7 $ \ pm $ 0.03）的功率法模型获得的，高能频谱截止点为12.9 $ \ pm $ 0.7 kev。在能量谱中检测到$ \ sim $ 6.3 keV的宽铁线。我们简要讨论这些结果的含义。
Results on timing and spectral properties of the Be/X-ray binary pulsar 3A 0726-260 (4U 0728-25) are presented. The binary was observed on 2016 May 6-7 with the Large Area X-ray Proportional Counter (LAXPC) and Soft X-ray Telescope (SXT) instruments onboard the AstroSat satellite. During this observation the source was in non-flaring persistent state at a flux level of $\sim$ 8.6 $\pm$ 0.3 $\times$10$^{-11}$ ergs cm$^{-2}$ sec$^{-1}$ in 0.4-20 keV. Strong X-ray pulsations with a period of 103.144$\pm$0.001 seconds are detected in 0.3-7 keV with the SXT and in 3-40 keV with the LAXPC. The pulse profile is energy dependent, and there is an indication that the pulse shape changes from a broad single pulse to a double pulse at higher energy. At energies above 20 keV, we report the first time detection of pulsation period 103.145$\pm$0.001 seconds and the double peaked pulse profile from the source. The energy spectrum of the source is derived from the combined analysis of the SXT and LAXPC spectral data in 0.4-20 keV. The best spectral fit is obtained by a power law model with a photon index (1.7$\pm$0.03) with high energy spectral cut-off at 12.9 $\pm$ 0.7 keV. A broad Iron line at $\sim$ 6.3 keV is detected in the energy spectrum. We briefly discuss the implications of these results.
