论文标题
在高速云中检测到h $ _2 $的大麦芽云
A detection of H$_2$ in a high velocity cloud toward the Large Magellanic Cloud
论文作者
论文摘要
这项工作提出了与银河系或大麦哲伦云（LMC）相关的高速云（HVC）中引起的H $ _2 $吸收的新检测。该吸收器是在LMC Star SK-70 $^\ Circ $ 32的档案远景光谱探索器光谱中发现的。这是在银河系的光环中找到的第五个良好的H $ _2 $吸收器，也是麦哲伦溪流和桥梁外的第二种吸收器。吸收器的当地静止中央速度标准为$+$+$ 140 km s $^{ - 1} $和a h $ _2 $列密度为$ 10^{17.5} $ cm $ $^{ - 2} $。它很可能是凉爽且相对密集的包含（$ t \ 75 $ k，$ n _ {\ rm h} \ sim 100 $ cm $^{ - 3} $）的一部分。这种光晕云可能是银河系喷泉流动的一部分，也可能是大型麦哲伦云的流出。
This work presents a new detection of H$_2$ absorption arising in a high velocity cloud (HVC) associated with either the Milky Way or the Large Magellanic Cloud (LMC). The absorber was found in an archival Far Ultraviolet Spectroscopic Explorer spectrum of the LMC star Sk-70$^\circ$32. This is the fifth well-characterized H$_2$ absorber to be found in the Milky Way's halo and the second such absorber outside the Magellanic Stream and Bridge. The absorber has a local standard of rest central velocity of $+$140 km s$^{-1}$ and a H$_2$ column density of $10^{17.5}$ cm$^{-2}$. It is most likely part of a cool and relatively dense inclusion ($T\approx 75$ K, $n_{\rm H}\sim 100$ cm$^{-3}$) in a warmer and more diffuse halo cloud. This halo cloud may be part of a still-rising Milky Way Galactic fountain flow or an outflow from the Large Magellanic Cloud.
