...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical Journal. Supplement Series >An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud
【24h】

An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud

机译：麦哲伦云中HI吸收的ATCA调查。 I. H i气体温度测量在小麦哲伦云中

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present the first results from the Small Magellanic Cloud portion of a new Australia Telescope Compact Array H I absorption survey of both of the Magellanic Clouds, comprising over 800 hr of observations. Our new H I absorption line data allow us to measure the temperature and fraction of cold neutral gas in a low-metallicity environment. We observed 22 separate fields, targeting a total of 55 continuum sources, against 37 of which we detected H I absorption; from this we measure a column-density-weighted mean average spin temperature of < T-s >= 150 K. Splitting the spectra into individual absorption line features, we estimate the temperatures of different gas components and find an average cold gas temperature of similar to 30 K for this sample, lower than the average of similar to 40 K in the Milky Way. The H I appears to be evenly distributed throughout the SMC, and we detect absorption in 67% of the lines of sight in our sample, including some outside the main body of the galaxy (N-H I > 2 x 10(21) cm(-2)). The optical depth and temperature of the cold neutral atomic gas show no strong trend with location spatially or in velocity. Despite the low-metallicity environment, we find an average cold gas fraction of similar to 20%, not dissimilar from that of the Milky Way.
机译：我们提出了新的澳大利亚望远镜紧凑型阵列H I吸收调查的第一个结果，包括800小时的观察结果。我们的新HI I吸收线数据允许我们测量低金属环境中冷中性气体的温度和分数。我们观察了22个独立的领域，瞄准总共55个连续源，针对我们检测到的37个，我们检测到HI吸收;由此，测量柱密度加权平均平均平均旋转温度 = 150k。将光谱分成单独的吸收线特征，我们估计不同气体成分的温度，并找到与30类似的平均冷气体温度k对于这种样品，低于银河系中的平均值。嗨似乎在整个SMC中均匀分布，我们检测到我们样品中的67％的67％的吸收，包括星系主体外部（NH I> 2×10（21）cm（-2） ）））。冷中性原子气体的光学深度和温度显示出在空间或速度的位置没有强大的趋势。尽管存在低金属性环境，但我们发现平均冷气体分数与20％相似，与银河系的影响不一样。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号