多环芳烃作为恒星形成率指示剂
Polycyclic Aromatic Hydrocarbons as Star Formation Rate Indicators
摘要：
由于ISO和Spitzer的图像和光谱提供了越来越高的中红外（MIR）和多环芳烃（PAH）发射的星系和银河系和银河系外区域的保真度表示，更系统的努力一直致力于确定是否在这个波长区域的发射可以作为一个可靠的恒星形成率指标。这也是对斯皮策太空望远镜在冷阶段积累的对遥远星系的广泛调查的回应。到目前为止，结果有些矛盾，反映了多环芳烃和中红外辐射尘埃的复杂性质。当试图根据星系和恒星形成区的中红外辐射来定义恒星形成率指标时，面临的两个主要问题是：（1）PAH辐射对金属丰度的强烈依赖;（2）与当前恒星形成无关的演化恒星星族对PAH尘埃的加热。我回顾了该领域的现状，特别关注这两个问题，并将尝试量化每个校准的中红外发射作为恒星形成率指标的影响。
英文摘要：
As images and spectra from ISO and Spitzer have provided increasingly higher-fidelity representations of the mid-infrared (MIR) and Polycyclic Aromatic Hydrocarbon (PAH) emission from galaxies and galactic and extra-galactic regions, more systematic efforts have been devoted to establishing whether the emission in this wavelength region can be used as a reliable star formation rate indicator. This has also been in response to the extensive surveys of distant galaxies that have accumulated during the cold phase of the Spitzer Space Telescope. Results so far have been somewhat contradictory, reflecting the complex nature of the PAHs and of the mid-infrared-emitting dust in general. The two main problems faced when attempting to define a star formation rate indicator based on the mid-infrared emission from galaxies and star-forming regions are: (1) the strong dependence of the PAH emission on metallicity; (2) the heating of the PAH dust by evolved stellar populations unrelated to the current star formation. I review the status of the field, with a specific focus on these two problems, and will try to quantify the impact of each on calibrations of the mid-infrared emission as a star formation rate indicator.
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