星系中多环芳烃性质的多尺度研究
A Multiscale Study of Polycyclic Aromatic Hydrocarbon Properties in Galaxies
摘要：
在本论文中，我总结了银河系区域和恒星形成星系的ISO和Spitzer中红外光谱的系统研究。这项研究量化了空间分辨对象内部的主要芳香特征的相对变化，以及50个对象的综合光谱之间。我们的分析意味着，在我们的样品中，在不同的空间尺度上，多环芳烃的属性是非常普遍的。此外，谱带比的相对变化可达一个数量级，主要受电离态多环芳烃含量的控制。特别是，我表明，我们可以排除PAH的尺寸分布和中红外消光的修改，这些变化的解释。高值的I（6.2）/I（11.3）的比例被发现与远紫外线照射的PDR表面，在星际云的规模，并与恒星形成活动，在星系的规模。利用几个研究得很好的银河系区域，我们提供了I（6.2）/I（11.3）比和电离/复合比G 0/ne之间的经验关系。最后，我表明，这些趋势是一致的，考虑到辐射转移，随机加热和气体和尘埃之间的电荷交换的详细建模的PAH排放的光解区域内。
英文摘要：
In the present contribution, I summarize a systematic study of ISO and Spitzer mid-IR spectra of Galactic regions and star forming galaxies. This study quantifies the relative variations of the main aromatic features inside spatially resolved objects as well as among the integrated spectra of 50 objects. Our analysis implies that the properties of the PAHs are remarkably universal throughout our sample and at different spatial scales. In addition, the relative variations of the band ratios, as large as one order of magnitude, are mainly controled by the fraction of ionized PAHs. In particular, I show that we can rule out both the modification of the PAH size distribution and the mid-IR extinction, as an explanation of these variations. High values of the I(6.2)/I(11.3) ratio are found to be associated with the far-UV illuminated surface of PDRs, at the scale of an interstellar cloud, and associated with star formation activity, at the scale of a galaxy. Using a few well-studied Galactic regions, we provide an empirical relation between the I(6.2)/I(11.3) ratio and the ionization/recombination ratio G0/ne. Finally, I show that these trends are consistent with the detailed modeling of the PAH emission within photodissociation regions, taking into account the radiative transfer, the stochastic heating and the charge exchange between gas and dust.
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