根据30 Dor C超泡X射线同步辐射边缘的磁场估算和30 Dor C TeV发射性质的暗示
Magnetic field estimates from the X-ray synchrotron emitting rims of the 30 Dor C superbubble and the implications for the nature of 30 Dor C's TeV emission
摘要：
30 Dor C超级气泡因其同步加速器X射线壳而独特，并且是在TeV $γ$射线中检测到的第一个超级气泡，尽管主要的TeV发射机制，即，轻子的还是强子的，还不清楚。我们的目标是使用新的钱德拉观测30 Dor C解决同步加速器壳前所未有的细节，并估计磁（$B$）场在冲击波后区域，TeV之间的一个关键点$γ$射线发射机制。我们提取的径向配置文件在1.5-8千电子伏的范围内，从各个部门周围的同步加速器外壳和拟合这些与投影和点扩散函数卷积postshock体积发射率模型，以确定灯丝宽度。然后我们根据这些宽度计算出了震后的磁场强度。我们发现大多数扇区与我们的冲击后模型很好地拟合，并且确定的$B$ -场值很低，都与$\lesssim 20~μ$ G最佳拟合。三个部门的置信区间上限达到了$\gtrsim 30~μ$ G，尽管这些限制很差。普遍较低的$B$场值表明TeV $γ$射线的起源以轻子为主。我们的休克后模型没有提供足够的适合两个部门。我们发现，一个扇区不能提供足够清晰的径向轮廓，而另一个扇区可以用一个修改过的模型来拟合，在这个模型中，投影轮廓在低于$\sim0.8$乘以壳半径时突然下降，产生了4.8（3.7-11.8）$μ$ G的激波后$B$ -场，这也与轻子TeV $γ$ -射线机制一致。或者，在这些部门所观察到的配置文件可能会导致增强周围的冲击云的相互作用，在以前的工作中建议。在30 Dor C的X射线同步加速器壳层周围测定的平均$B$ -场表明轻子方案是TeV $γ$ -射线的主要发射机制。
英文摘要：
The 30 Dor C superbubble is unique for its synchrotron X-ray shell, as well as being the first superbubble to be detected in TeV $γ$-rays, though the dominant TeV emission mechanism, i.e., leptonic or hadronic, is still unclear. We aim to use new Chandra observations of 30 Dor C to resolve the synchrotron shell in unprecedented detail and to estimate the magnetic ($B$) field in the postshock region, a key discriminator between TeV $γ$-ray emission mechanisms. We extracted radial profiles in the 1.5-8 keV range from various sectors around the synchrotron shell and fitted these with a projected and point spread function convolved postshock volumetric emissivity model to determine the filament widths. We then calculated the postshock magnetic field strength from these widths. We found that most of the sectors were well fitted with our postshock model and the determined $B$-field values were low, all with best fits $\lesssim 20~μ$G. Upper limits on the confidence intervals of three sectors reached $\gtrsim 30~μ$G though these were poorly constrained. The generally low $B$-field values suggests a leptonic-dominated origin for the TeV $γ$-rays. Our postshock model did not provide adequate fits to two sectors. We found that one sector simply did not provide a clean enough radial profile, while the other could be fitted with a modified model where the projected profile falls off abruptly below $\sim0.8$ times the shell radius, yielding a postshock $B$-field of 4.8 (3.7-11.8) $μ$G which is again consistent with the leptonic TeV $γ$-ray mechanism. Alternatively, the observed profiles in these sectors could result from enhancements around a shock-cloud interaction as suggested in previous works. The average $B$-field determined around the X-ray synchrotron shell of 30 Dor C suggests the leptonic scenario as the dominant emission mechanism for the TeV $γ$-rays.
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