Processing of polycyclic aromatic hydrocarbons in molecular-loop regions near the Galactic center revealed by AKARI
Processing of polycyclic aromatic hydrocarbons in molecular-loop regions near the Galactic center revealed by AKARI
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AKARI 揭示了银河系中心附近分子环区域中多环芳烃的加工过程
DOI：
10.1093/pasj/64.2.25
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发表时间：
2012
影响因子：
2.3
通讯作者：
K. Torii
中科院分区：
文献类型：
--
作者：
H. Kaneda;D. Ishihara;A. Mouri;S. Oyabu;M. Yamagishi;T. Kondo;T. Onaka;Y. Fukui;A. Kawamura;K. Torii
我们展示了 AKARI 中红外漫射图，其区域在 9m 波段的银河系中心附近约 43 平方千米。谱带强度主要归因于碳质颗粒在 6.2、7,7、8.6 和 11.3m 波长处的芳香烃红外发射。我们检测到从银河平面延伸到纬度 25 的 9m 发射结构，这些结构与 NANTENCO (1-0) 观测揭示的分子环具有空间对应关系。我们发现，CO 环路脚点附近 9m 处的表面亮度受到抑制。 9m 与 IRAS 100m 亮度的比率显示，在此类明亮区域附近，CO 排放量显着下降。通过 AKARI 近红外 2.5-5m 光谱，我们发现与环路相关的区域不存在 3.3m 芳香烃排放，这表明 CO 分子环路中碳质颗粒的加工和破坏。
We present an AKARI mid-infrared diffuse map of an area of about 43near the Galactic center in the 9m band. The band intensity is mostly attributed to aromatic hydrocarbon infrared emissions of carbonaceous grains at wavelengths of 6.2, 7,7, 8.6, and 11.3m. We detected 9m emission structures extending from the Galactic plane up to a latitude of25, which have spatial correspondence to molecular loops revealed by NANTENCO (1–0) observations. We have found that the surface brightness at 9m is suppressed near the foot points of the CO loops. The ratios of the 9m to the IRAS 100m brightness show significant depression near such bright regions in CO emission. With AKARI near-infrared 2.5–5m spectroscopy, we find that the 3.3m aromatic hydrocarbon emission is absent in the region associated with the loop, suggesting the processing and destruction of carbonaceous grains in the CO molecular loops.