论文标题
在2019年爆发期间，Gro J2058+42的Astrosat观察结果
AstroSat observations of GRO J2058+42 during the 2019 outburst
论文作者
论文摘要
我们介绍了Astrosat观察到GRO J2058+42的爆发，这是Be-Binary系统中的X射线脉冲星。 LaxPC和SXT Instruments在Astrosat上观察到了该消息来源，在最新巨人爆发的阶段不断下降。光曲线显示出强烈的脉冲脉冲，其周期为194.2201 \ pm 0.0016 s，并且旋转速率为（1.65 \ pm0.06）\ times10^{ - 11} hz s^{ - 1}。在3--80 KEV能量带之间检测到间歇性耀斑，强度的增加高达其平均强度的1.8倍。 Pulsar的3--80 KEV能带之间获得的脉冲轮廓表现出强烈的依赖性。在Astrosat观测值期间，在源的功率密度光谱中观察到了较大的峰值，其峰值振荡频率为0.090 Hz以及其较高的谐波，这可能是由于准周期性振荡所致，这是由于在爆发期间，在瞬态X射线脉冲脉冲中通常观察到的现象。 Astrosat观测还检测到其光谱中的回旋子吸收特征，对应于（9.7---14.4）KeV，（19.3---23.8）KeV和（37.8---43.1）Kev。源脉冲分辨率的光谱显示了其能量和这些特征的相对强度的相位依赖性变化。该频谱配备了吸收的黑体，费米狄拉克截止模型，并带有吸收的Comptt模型。这两个模型均与FE线和三个高斯吸收线结合使用，以说明频谱中观察到的回旋共振散射特征。
We present results from AstroSat observation of the recent outburst of GRO J2058+42, an X-ray pulsar in a Be-binary system. The source was observed on April 10, 2019 by LAXPC and SXT instruments on AstroSat during its declining phase of the latest giant outburst. Light curves showed a strong pulsation of the pulsar with a period of 194.2201 \pm 0.0016 s, and a spin-up rate of (1.65\pm0.06)\times10^{-11} Hz s^{-1}. Intermittent flaring was detected in light curves between 3--80 keV energy band with increase in intensity by up to 1.8 times its average intensity. Pulse profiles obtained between 3--80 keV energy band of the pulsar showed strong dependence on energy. A broad peak was observed in the power density spectrum of the source consistently during AstroSat observations with its peak oscillation frequency of 0.090 Hz along with its higher harmonics, which may be due to quasi-periodic oscillations, a commonly observed phenomenon in transient X-ray pulsars, during their outburst. AstroSat observation also detected cyclotron absorption features in its spectrum corresponding to (9.7--14.4) keV, (19.3--23.8) keV and (37.8--43.1) keV. The pulse phase resolved spectroscopy of the source showed phase dependent variation in its energy and relative strength of these features. The spectrum was well fitted with an absorbed black-body, a Fermi Dirac cut-off model and alternatively with an absorbed CompTT model. Both these models were combined with a Fe-line and three Gaussian absorption lines to account for observed cyclotron resonance scattering features in the spectrum.
