论文标题
使用ASTROSAT观察的HMXB 4U 2206+54中的旋转速率和发射线的检测
Change in spin-down rate and detection of emission line in HMXB 4U 2206+54 with AstroSat observation
论文作者
论文摘要
这项工作使用从印度船上的saterosat任务获得的数据进行了4U 2206+54的时间和光谱分析。该消息来源于2016年9月和2016年10月在Astrosat中观察到。我们报告了MJD 57669的5648（4）$ S脉动的检测，后者在4U 2206+54的后期观察结果中发现了票据。脉冲轮廓是正弦的，固有形状与最高30 keV的能量无关。脉冲分数随$ \ sim 0.5 $％增加到$ \ sim 0.8 $％而增加。我们报告了更新的旋转率$ 2.95（14）\ times 10^{ - 7} $ s s $^{ - 1} $。这是先前报道的长期值的0.40倍。能量谱最好用具有高能量指数截止的吸收幂律对其进行建模。我们已经在4U 2206+54中检测到宽发射线，其能量为$ 7 $ KEV，等效宽度为$ \ sim 0.4 $ kev。
This work presents timing and spectral analysis of 4U 2206+54 using data obtained from LAXPC instrument onboard India's AstroSat mission. This source was observed with AstroSat in September 2016 and October 2016. We report detection of $5648 (4)$ s pulsations at MJD 57669 in the latter observation of 4U 2206+54. The pulse profile is sinusoidal and the inherent shape is independent of energy up to 30 keV. The pulse fraction increases with energy from $\sim 0.5$% to $\sim 0.8$%. We report an updated spin down rate of $2.95 (14) \times 10^{-7}$ s s$^{-1}$. This is about 0.40 times smaller than the previously reported long term value. The energy spectrum is best modelled with an absorbed power-law with high energy exponential cut-off. We have detected presence of broad emission line in 4U 2206+54 at an energy of $7$ keV with equivalent width of $\sim 0.4$ keV.
