论文标题
使用COBE/DIRBE数据跟踪PAH排放$λ$ -ORIONIS
Tracing PAH Emission in $λ$-Orionis Using COBE/DIRBE Data
论文作者
论文摘要
我们使用档案馆/DIRBE数据来构建$λ$ -Orionis区域中多环芳烃（PAH）发射的地图。 Dirbe 3.5 $ $ m频段中的3.3 $ $ m PAH功能以及相邻的dirbe频段（1.25、2.2和4.9 $ $ m）在相应的PAH光谱功能中的相应缺乏，允许对PAH估计3.5 $ $ m $ m数据的PAH贡献。 3.3 $ $ m的特征具有最短的已知PAH特征波长，最小的PAHS也是主要的微波发射（AME）载体的主要候选者。我们使用此图来研究AME与PAH分子发射之间的关联。我们发现，$λ$ -Orionis中的空间相关性在AME和远红外灰尘发射之间（由Dirbe 240 $μ$ m映射表示），比我们的PAH映射和AME之间的空间相关性更高。这一发现与以前使用PAH特征在较长波长的研究一致，与AME是由于旋转PAH所致的假设。但是，即使PAH是两者的载体，每种发射机制的不同敏感性与局部环境条件之间的不同敏感性可能会降低中红外和微波发射之间的预期相关性。
We use archival COBE/DIRBE data to construct a map of polycyclic aromatic hydrocarbon (PAH) emission in the $λ$-Orionis region. The presence of the 3.3 $μ$m PAH feature within the DIRBE 3.5 $μ$m band and the corresponding lack of significant PAH spectral features in the adjacent DIRBE bands (1.25, 2.2, and 4.9 $μ$m) enable estimation of the PAH contribution to the 3.5 $μ$m data. Having the shortest wavelength of known PAH features, the 3.3 $μ$m feature probes the smallest PAHs, which are also the leading candidates for carriers of anomalous microwave emission (AME). We use this map to investigate the association between the AME and the emission from PAH molecules. We find that the spatial correlation in $λ$-Orionis is higher between AME and far-infrared dust emission (as represented by the DIRBE 240 $μ$m map) than it is between our PAH map and AME. This finding, in agreement with previous studies using PAH features at longer wavelengths, is in tension with the hypothesis that AME is due to spinning PAHs. However, the expected correlation between mid-infrared and microwave emission could potentially be degraded by different sensitivities of each emission mechanism to local environmental conditions even if PAHs are the carriers of both.
