论文标题
NGC 4045中的X射线源中的8.56 KEV吸收线：超快速流出还是回旋线？
An 8.56 keV absorption line in the hyperluminous X-ray source in NGC 4045: ultra-fast outflow or cyclotron line?
论文作者
论文摘要
我们报告发现在$ e = 8.56^{+0.05} _ { - 0.11} $ kev检测到的吸收线的发现，其在Nustar和Xmm-Newton Spectra中的显着性为$>3.3σ$，该光谱是新近发现的X-ray source（hlx，$ l _ _ { Galaxy NGC 4045中的ERGS $^{ - 1} $，距离为32 MPC。首先在银河系的快速/XRT观察中偶然发现了源，而Swift监视揭示了高度可变的源从最大值到最小值的数量级变化。吸收线的起源似乎是由高度离子化的铁，蓝移为0.19 $ c $，表明超快流出（UFO）。但是，该线的大宽度（ew $ = -0.22^{+0.08} _ { - 0.09} $ keV）与缺乏检测到的其他吸收线的缺乏与模型进行调和。另一种解释是该线是由于X射线光子与中子星的强大磁场的相互作用产生的回旋共振散射特征（CRSF）。
We report on the discovery of an absorption line at $E=8.56^{+0.05}_{-0.11}$ keV detected with a significance of $>3.3σ$ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (HLX, $L_{\rm X}>10^{41}$ ergs$^{-1}$) in the galaxy NGC 4045 at a distance of 32 Mpc. The source was first discovered serendipitously in a Swift/XRT observation of the galaxy, and Swift monitoring reveals a highly variable source changing by over an order of magnitude from maximum to minimum. The origin of the absorption line appears likely to be by highly ionized iron with a blue shift of 0.19$c$, indicating an ultrafast outflow (UFO). However, the large equivalent width of the line (EW$=-0.22^{+0.08}_{-0.09}$ keV) paired with the lack of other absorption lines detected are difficult to reconcile with models. An alternative explanation is that the line is due to a cyclotron resonance scattering feature (CRSF), produced by the interaction of X-ray photons with the powerful magnetic field of a neutron star.
