论文标题
监视SMC X-1游览（驼鹿）I的观察结果：程序说明和初始高州光谱结果
Monitoring Observations of SMC X-1's Excursions (MOOSE) I: Program Description and Initial High-State Spectral Results
论文作者
论文摘要
自1995年RXTE发射以来，SMC X-1自1995年推出以来，SMC X-1已经展示了三次超级轨道时期的游览。Nicer最近探索了2021年开始的第四次观察到的游览，我们的程序监视了SMC X-1的节目（Moose）。这些敏感的新驼鹿数据探测它们内部不同的超级轨道周期和相位。光谱符合2021年4月至2022年1月的高州连续体，表明固有的光谱形状的特征是柔软（kt〜0.19 keV）盘组件和硬（伽马市〜0.7）的幂律尾部。将2021-2022在游览期间进行的更好的观察结果与2016 XMM-Newton观察结果（在旅行之外）进行了比较时，我们几乎没有发现高标准之间固有频谱变异性的证据，但是发现吸收> 3 Sigma的证据，尽管我们警告了两种仪器之间可能存在校准差异。因此，在不同长度的超轨道时期，我们几乎没有证据表明高州内在光谱变化。即将进行的对脉冲轮廓的研究可能会阐明游览背后的机制。
SMC X-1 has exhibited three super-orbital period excursions since the onset of X-ray monitoring beginning with RXTE's launch in 1995. NICER has recently probed a fourth observed excursion beginning in 2021 with our program Monitoring Observations of SMC X-1's Excursions (MOOSE). These sensitive new MOOSE data probe different super-orbital periods and phases within them. Spectral fits to the high-state continuum during April 2021 to January 2022 show that the intrinsic spectral shapes are characterised by a soft (kT~0.19 keV) disc component and a hard (Gamma~0.7) power-law tail. When the 2021-2022 NICER observations, taken during an excursion, are compared to 2016 XMM-Newton observations (outside of an excursion), we find little evidence for intrinsic spectral variability across the high-states, but find evidence for a >3 sigma change in the absorption, although we caution that there may be calibration differences between the two instruments. Thus, over different lengths of super-orbital periods, we see little evidence for intrinsic spectral changes in the high-state. Upcoming studies of the pulse profiles may shed light on the mechanism behind the excursions.
