• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >FIRST DETECTION OF SUBMILLIMETER [C l] EMISSION IN THE SMALL MAGELLANIC CLOUD
【24h】

FIRST DETECTION OF SUBMILLIMETER [C l] EMISSION IN THE SMALL MAGELLANIC CLOUD

机译：麦哲伦云中亚砜[C l]排放的首次检测

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 report the first detection of [C I] (~3p_1 t~3pPo) emission at 609 pm in a region of the Small Magellanic Cloud (N27). Environments poor in heavy elements and dust such as the SMC are thought to be dominated by photo- dissociation regions (PDRs). This is the lowest metallicity source where submillimeter neutral carbon emission has been detected. Studying the I_|CI|/I_co. ratio in several sources spanning more than an order of magnitude in metal1icity Z we find that the I_|CI|/I_co ratio increases for decreasing Z. The existence of such a trend points to a photodissociation origin for most of the neutral carbon in molecular clouds, in agreement with standard PDR models. We also report infrared Space Observatory farinfrared (FIR) spectroscopic observations of N27 and use them to derive its physical properties. Comparison between the density and radiation field revealed by FIR diagnostics (n ~ 300--l000 cm~-3 X_uv ~ 30Xo--l00Xo) and those derived from millimeter and submillimeter data (n ~ l0~5 cm~-3, X_uv≤ 30Xo) suggests that the FIR lines originate in more diffuse gas and are perhaps dominated by the interclump medium. Regardless of the cause, analysis of the FIR and millimetersubmillimeter data produces a discrepancy of 2 orders of magnitude for the density of this source.
机译：我们报告了在小麦哲伦星云（N27）区域中的609 pm首次检测到[CI]（〜3p_1 t〜3pPo）发射。 SMC等重元素和粉尘少的环境被认为是光解离区（PDR）的主导。这是检测到亚毫米级中性碳排放的最低金属性来源。研究I_ | CI | / I_co。我们发现，金属来源Z中超过一个数量级的多个源中的碳原子比，我们发现I_ | CI | / I_co比率随着Z的减小而增加。这种趋势的存在指向分子云中大多数中性碳的光解离起源，与标准PDR模型一致。我们还报告了N27的红外太空观测仪的远红外（FIR）光谱观察，并使用它们来得出其物理性质。 FIR诊断（n〜300--l000 cm〜-3 X_uv〜30Xo--00Xo）与从毫米和亚毫米波数据得出的密度和辐射场（n〜l0〜5 cm〜-3，X_uv≤ 30Xo）表明，FIR谱线起源于更多的扩散气体，并且可能由丛生介质主导。无论原因如何，FIR和毫米亚毫米级数据的分析都会导致此源的密度产生2个数量级的差异。

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