论文标题
在X射线排放中看到的银河系的磁盘主导和块状的环境介质
A disk-dominated and clumpy circumgalactic medium of the Milky Way seen in X-ray emission
论文作者
论文摘要
银河系的银河系被环境培养基（CGM）所包围，该介质可能在星系进化中起关键作用，作为恒星形成的气体的来源，以及由星形形成和核活动产生的金属和能量的储存库。 CGM也可能是早期宇宙中的Baryons的存储库，但在本地未被发现。 CGM在温度接近$ 2 \ times 10^{6} $ 〜k的温度下具有一个离子成分，主要是在软X射线频带中研究的。在这里，我们报告了对南部银河天空的调查，该调查具有优化的软X射线光谱仪，以研究扩散的软X射线发射。 X射线发射最适合基于分子氢的表面密度（恒星形成的示踪剂）表面密度的圆盘状模型，这表明X射线发射主要来自通过恒星反馈产生的热等离子体。 $ \ sim10^{\ circ} $的角度尺度上X射线发射的强烈变化表明CGM是块状的。需要添加扩展（可能是巨大的）光环成分，以匹配其他观察值推断的光环密度。
The Milky Way galaxy is surrounded by a circumgalactic medium (CGM) that may play a key role in galaxy evolution as the source of gas for star formation and a repository of metals and energy produced by star formation and nuclear activity. The CGM may also be a repository for baryons seen in the early universe, but undetected locally. The CGM has an ionized component at temperatures near $2 \times 10^{6}$~K studied primarily in the soft X-ray band. Here we report a survey of the southern Galactic sky with a soft X-ray spectrometer optimized to study diffuse soft X-ray emission. The X-ray emission is best fit with a disc-like model based on the radial profile of the surface density of molecular hydrogen, a tracer of star formation, suggesting that the X-ray emission is predominantly from hot plasma produced via stellar feedback. Strong variations in the X-ray emission on angular scales of $\sim10^{\circ}$ indicate that the CGM is clumpy. Addition of an extended, and possibly massive, halo component is needed to match the halo density inferred from other observations.
