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arXiv 0811.3541astro-ph
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活动星系团致密分子气体中能量源的三维线转移研究-- AGN/星爆连接--

Three Dimensional Line Transfer Study of Energy Sources in Compact Molecular Gas in Active Galaxies -- AGN/Starburst Connection --

Masako Yamada, Wada Keiichi, Kohji Tomisaka

摘要:

最近的观测表明,毫米和亚毫米波段的分子谱线比可能是一个很好的工具,以揭示长期存在的问题,能源的来源,在模糊的活动星系- AGN和/或星爆。对实际分子介质的观察显示出一般的不均匀结构,以及高分辨率的流体动力学模拟。为了精确解释非均匀分子气体的出射谱线辐射,探索活动星系的主要能量来源,我们通过三维非局域热力学平衡(non-LTE,non-local thermodynamic equilibrium)谱线传输模拟研究了出射强度的特征.我们的结果成功地阐明了1)HCN/HCO $^{+}$ -二分法的必要条件,和2)团块对强度比的重要性及其解释。这些结果是首次通过三维模拟得到的,线传输模拟将为未来ALMA(Atacama Large Millimeter/Submillimeter Array)时代的河外星际介质(ISM)研究提供有力的工具。

英文摘要:

Recent observations suggest molecular line ratios in millimeter and submillimeter bands may be a good tool to reveal the long-standing question on the origin of energy sources in obscured active galaxies -- AGN and/or starburst. Observations of actual molecular medium show in general inhomogeneous structures as well as high-resolution hydrodynamic simulations do. In order for precise interpretation of emergent line emission from the inhomogeneous molecular gas to probe the dominant energy source of active galaxies, we study characteristic features of emergent intensities via three-dimensional non-LTE (non-local thermodynamic equilibrium) line transfer simulations. Our results succeeded in making clear 1) the necessary conditions for HCN/HCO$^{+}$-dichotomy, and 2) importance of clumpiness on intensity ratio and its interpretation. These results are obtained for the first time by our realistic three-dimensional simulations, and line transfer simulations will be a powerful tool to comprehensive studies of extragalactic interstellar medium (ISM) in forthcoming ALMA (Atacama Large Millimeter/submillimeter Array) era.

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