首页> 外文期刊>The Astrophysical journal >DISCOVERY OF THE ll.2 MICRON POLYCYCLIC AROMATIC HYDROCARBON BAND IN ABSORPTION TOWARD MONOCEROS R2 IRS 3
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DISCOVERY OF THE ll.2 MICRON POLYCYCLIC AROMATIC HYDROCARBON BAND IN ABSORPTION TOWARD MONOCEROS R2 IRS 3

机译:ll.2微米多环芳烃碳带对单峰R2 IRS 3的吸收发现

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Interpretation of the infrared emission bands is difficult because these bands likely arise from a mixture of ionized and neutral polycyclic aromatic hydrocarbon (PAH) molecules. Modeling the emission process is also difficult because the size distribution of the molecules, their ionization state and excitation, and the geometry of the emitting regions are generally unknown. If these molecular bands could be found in absorption, many of these factors would be eliminated, making it much easier to interpret the data. We have discovered an absorption band in Monoceros R2 IRS 3 centered at 1 1 .25 Um that we identify with a C--H out-of plane vibrational mode of PAH molecules. The shape and position of the band are very similar to that seen in emission in planetary nebulae, H lI regions, and the interstellar medium.
机译:红外发射谱带很难解释,因为这些谱带可能是由离子化和中性的多环芳烃(PAH)分子的混合物产生的。发射过程的建模也很困难,因为分子的大小分布,其电离状态和激发以及发射区域的几何形状通常是未知的。如果可以在吸收中发现这些分子带,则将消除许多这些因素,从而更容易解释数据。我们在Monoceros R2 IRS 3中发现了一个以1 1 .25 Um为中心的吸收带,我们用PAH分子的C–H面外振动模式确定了该吸收带。该带的形状和位置与行星状星云,H II区和星际介质中的发射非常相似。

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