论文标题
冷hi弹入麦哲伦流
Cold HI ejected into the Magellanic Stream
论文作者
论文摘要
我们报告了从小麦哲伦云（SMC）弹出的云中直接检测到冷气气体。云是在SMC郊区零散的HI气体外壳的一部分。这是使用吸收与麦哲伦流相关的冷HI的第二个直接检测。使用澳大利亚望远镜紧凑型阵列（ATCA）的21厘米HI吸收线观测来检测冷气，朝向半乳酸外源PMN J0029 $ -7228。我们发现气体的旋转（激发）温度为$ 68 \ pm 20 $K。我们建议从麦芽岩云中折断超级壳可能是冷气的来源，可以提供其余的麦哲伦流。
We report the direct detection of cold HI gas in a cloud ejected from the Small Magellanic Cloud (SMC) towards the Magellanic Stream. The cloud is part of a fragmented shell of HI gas on the outskirts of the SMC. This is the second direct detection of cold HI associated with the Magellanic Stream using absorption. The cold gas was detected using 21-cm HI absorption-line observations with the Australia Telescope Compact Array (ATCA) towards the extra-galactic source PMN J0029$-$7228. We find a spin (excitation) temperature for the gas of $68 \pm 20$ K. We suggest that breaking super shells from the Magellanic Clouds may be a source of cold gas to supply the rest of the Magellanic Stream.
