论文标题
宽带MHz QPO和LMC X $ -4的光谱研究与Astrosat
Broadband mHz QPOs and spectral study of LMC X$-$4 with AstroSat
论文作者
论文摘要
我们报告了宽带定时和光谱分析的结果，从Astrosat观察到高质量X射线二进制LMC X $ -4 $ 4的数据。大面积X射线比例计数器（LAXPC）和软X射线望远镜（SXT）仪器在板载板上观察到源于2016年8月。通过LAXPC检测到完整的X射线日食。 3 $ - $ 40 KEV功率密度频谱显示出相干脉动以及$ \ sim 26 $ MHz准周期振荡功能。 LMC X $ -4的光谱特性来自SXT和LAXPC光谱数据的联合分析。 0.5 $ -25 $ 25的kev持续光谱由吸收的高能截止功率定律组成，其光子指数为$γ\ sim $ 0.8，$ \ sim $ 16 kev，$ \ sim $ 16 kev，一种具有kt $ _ {bb} \ sim $ 0.14 kev and kev and nee ne ne ne ne ne ne ne ne ne ne ne fe kt $ _ {bb} \ sim; \ textsc {x}发射线。假设源距离为50 kpc，我们确定0.5--25 keV光度为$ \ sim 2 \ times 10^{38} $ erg s $^{ - 1} $。
We report the results of broadband timing and spectral analysis of data from an AstroSat observation of the High Mass X-ray binary LMC X$-$4. The Large Area X-ray Proportional Counter (LAXPC) and Soft X-ray Telescope (SXT) instruments on-board the AstroSat observed the source in August 2016. A complete X-ray eclipse was detected with the LAXPC. The 3$-$40 keV power density spectrum showed the presence of coherent pulsations along with a $\sim 26$ mHz quasi-periodic oscillation feature. The spectral properties of LMC X$-$4 were derived from a joint analysis of the SXT and LAXPC spectral data. The 0.5$-$25 keV persistent spectrum comprised of an absorbed high energy cutoff power law with photon index of $Γ\sim$ 0.8 and cutoff at $\sim$16 keV, a soft thermal component with kT$_{BB} \sim$ 0.14 keV and Gaussian components corresponding to Fe K$_α$, Ne \textsc{ix} and Ne \textsc{x} emission lines. Assuming a source distance of 50 kpc, we determined 0.5--25 keV luminosity to be $\sim 2 \times 10^{38}$ erg s$^{-1}$.
