论文标题
SS 433的Eastern Jet的硬X射线发射为W50``Manatee''星云供电：粒子重新加速的证据
Hard X-ray emission from the eastern jet of SS 433 powering the W50 `Manatee' nebula: Evidence for particle re-acceleration
论文作者
论文摘要
我们提出了由Microquasar SS 433提供动力的复杂区域W50（“海牛星云”）的宽带X射线研究，为几个重要的天体物理过程提供了测试床。 The W50 nebula, a Galactic PeVatron candidate, is classified as a supernova remnant but has an unusual double-lobed morphology likely associated with the jets from SS 433. Using NuSTAR, XMM-Newton, and Chandra observations of the inner eastern lobe of W50, we have detected hard non-thermal X-ray emission up to $\sim$30 keV, originating from a几乎没有Arcminute尺寸的打结区域（“头”），位于$ \ Lessim $ 18 $^{\ prime} $（29 PC（29 PC，距离SS 433的距离为5.5 kpc），并将其光子指数限制为1.58 $ \ pm $ 0.05（0.5-30 kev band）。该索引逐渐向东陡峭地向东陡峭地向东倾斜到无线电“耳朵”，其中温度$ kt $ kt $ \ sim $ 0.2 kev占主导地位的热软X射线发射。硬X射线结标记了射流中加速度位置的位置，并需要$ \ gtrsim $ 12 $μ$ g的均衡磁场。从“头部”区域的异常硬光谱指数挑战了经典的粒子加速过程，并指出了亚相关性SS 433射流中的颗粒注入和重新加速，如Blazars和Pulsar风星号所示。
We present a broadband X-ray study of W50 (`the Manatee nebula'), the complex region powered by the microquasar SS 433, that provides a test-bed for several important astrophysical processes. The W50 nebula, a Galactic PeVatron candidate, is classified as a supernova remnant but has an unusual double-lobed morphology likely associated with the jets from SS 433. Using NuSTAR, XMM-Newton, and Chandra observations of the inner eastern lobe of W50, we have detected hard non-thermal X-ray emission up to $\sim$30 keV, originating from a few-arcminute size knotty region (`Head') located $\lesssim$ 18$^{\prime}$ (29 pc for a distance of 5.5 kpc) east of SS 433, and constrain its photon index to 1.58$\pm$0.05 (0.5-30 keV band). The index gradually steepens eastward out to the radio `ear' where thermal soft X-ray emission with a temperature $kT$$\sim$0.2 keV dominates. The hard X-ray knots mark the location of acceleration sites within the jet and require an equipartition magnetic field of the order of $\gtrsim$12$μ$G. The unusually hard spectral index from the `Head' region challenges classical particle acceleration processes and points to particle injection and re-acceleration in the sub-relativistic SS 433 jet, as seen in blazars and pulsar wind nebulae.
