Cold H i ejected into the Magellanic Stream
Cold H i ejected into the Magellanic Stream
复制标题
冷氢喷射到麦哲伦流中
DOI：
10.1093/mnras/staa1602
复制
发表时间：
2020
影响因子：
4.8
通讯作者：
F. Buckland
中科院分区：
文献类型：
--
作者：
J. Dempsey;N. McClure;K. Jameson;F. Buckland
我们报告的直接检测到冷HI气体的云喷射的小麦哲伦云（SMC）朝向麦哲伦流。云是SMC外围HI气体碎片壳的一部分。这是第二次利用吸收直接探测到与麦哲伦流有关的冷HI。使用澳大利亚望远镜紧凑阵列（ATCA）对银河系外源PMN J 0029 $-$7228进行的21厘米HI吸收线观测发现了冷气体。我们发现气体的自旋（激发）温度为68\pm 20$ K。我们认为，从麦哲伦云中破碎的超级壳层可能是供应麦哲伦流其余部分的冷气体的来源。
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.