论文标题
对年轻脉冲星云星云的光谱变化和亮度曲线的全面研究
A Comprehensive Study of the Spectral Variation and the Brightness Profile of Young Pulsar Wind Nebulae
论文作者
论文摘要
我们提出了一项系统的研究，该研究是通过扩散在年轻的脉冲星（Pulsar Wind Nebulae（PWNE））中扩散的颗粒传输研究。我们选择了Chandra X射线观测站很好地解决的九种明亮来源。我们分析了档案数据以以一致的方式获得其光子指数（$γ$）和表面亮度（$σ$）的径向概况。然后将这些轮廓与纯散射模型拟合，该模型在Crab，3C 58和G21.5 $ -0.9之前进行了测试。除了由于扩散而引起的光谱软化外，我们还计算了同步加速器功率并构建了理论表面亮度曲线。对于每个来源，我们对$γ$和$σ$配置文件进行了单独的拟合。我们发现，除了螃蟹和Vela外，大多数石是相似的这两个曲线。我们的模型都可以很好地描述这两种曲线，这表明扩散在大多数采样的怪胎中占主导地位。对于3C 58和G54.1+0.3，$γ$配置文件和$σ$概况之间的参数差异相对较大。这种差异可以归因于伸长的形状，反映边界和不均匀的磁场。最后，我们发现PWN和PULSAR的扩散参数与物理参数之间没有显着相关性。
We present a systematic study of particle transport by diffusion in young pulsar wind nebulae (PWNe). We selected nine bright sources that are well resolved with the Chandra X-ray Observatory. We analyzed archival data to obtain their radial profiles of photon index ($Γ$) and surface brightness ($Σ$) in a consistent way. These profiles were then fit with a pure diffusion model that was tested on Crab, 3C 58 and G21.5$-$0.9 before. In addition to the spectral softening due to the diffusion, we calculated the synchrotron power and built up the theoretical surface brightness profile. For each source, we performed separate fits to the $Γ$ and the $Σ$ profiles. We found these two profiles of most PWNe are similar, except for Crab and Vela. Both profiles can be well described by our model, suggesting that diffusion dominates the particle transport in most sampled PWNe. The discrepancy of parameters between the $Γ$ profile and $Σ$ profiles is relatively large for 3C 58 and G54.1+0.3. This difference could be attributed to the elongated shape, reflecting boundary, and the non-uniform magnetic field. Finally, we found no significant correlations between diffusion parameters and physical parameters of PWN and pulsar.
