首页> 外文期刊>The Astrophysical journal >Detection Of The ~(13)co J = 6 → 5 Transition In The Starburst Galaxy Ngc 253
【24h】

Detection Of The ~(13)co J = 6 → 5 Transition In The Starburst Galaxy Ngc 253

机译:在星暴Ngc 253中检测〜(13)co J = 6→5跃迁

获取原文
获取原文并翻译 | 示例
           

摘要

We report the detection of ~(13)CO J = 6 → 5 emission from the nucleus of the starburst galaxy NGC 253 with the redshift (z) and Early Universe Spectrometer (ZEUS), a new submillimeter grating spectrometer. This is the first extragalactic detection of the ~(13)CO J = 6 → 5 transition, which traces warm, dense molecular gas. We employ a multiline LVG analysis and find ≈35%-60% of the molecular interstellar medium is both warm (T ~ 110 K) and dense (n_(H_2)Hi ~ 10~4 cm~(-3)). We analyze the potential heat sources and conclude that ultraviolet and X-ray photons are unlikely to be energetically important. Instead, the molecular gas is most likely heated by an elevated density of cosmic rays or by the decay of supersonic turbulence through shocks. If the cosmic rays and turbulence are created by stellar feedback within the starburst, then our analysis suggests the starburst may be self-limiting.
机译:我们报告了使用红移(z)和早期宇宙光谱仪(ZEUS)(一种新的亚毫米光栅光谱仪)检测到爆炸形星系NGC 253的〜(13)CO J = 6→5发射。这是〜(13)CO J = 6→5跃迁的首次河外探测,该跃迁跟踪温暖的致密分子气体。我们采用多线LVG分析,发现约35%-60%的星际分子介质既是温暖的(T〜110 K)又是稠密的(n_(H_2)Hi〜10〜4 cm〜(-3))。我们分析了潜在的热源并得出结论,紫外线和X射线光子在能量上不太重要。取而代之的是,分子气体最有可能被宇宙射线的密度升高或超声速湍流通过冲击的衰减而加热。如果宇宙射线和湍流是由星爆内的恒星反馈产生的,那么我们的分析表明,星爆可能是自限性的。

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