z~0.1时半乳糖醛酸中的多环芳烃：星形形成和AGN的影响
Polycyclic Aromatic Hydrocarbons in Galaxies at z~0.1: the Effect of Star Formation and AGN
摘要：
本文分析了92个典型恒星形成星系的多环芳烃（PAH）光谱（0.03 < z < 0.2）。我们比较了PAH发射特征与SDSS光学诊断的相对强度，以探讨PAH颗粒性质与恒星形成和活动星系核活动之间的关系。短波长与长波长的PAH比值，特别是7.7微米与11.3微米的特征比值，与恒星形成诊断值D_n（4000）和H-α等效宽度密切相关，并随着年轻恒星星族的增加而增加。这个比率也显示了活跃星系和非活跃星系之间的显着差异，活跃星系表现出较弱的7.7微米发射。由[OIII]/H-β和[NeIII]_15.6/[NeII]_12.8测量的硬辐射场对PAH比率的影响不同，这取决于该场是由星暴活动还是活动星系核引起的。我们的研究结果是一致的图片中，较大的PAH分子生长更有效地在更丰富的媒体和较小的PAH分子优先销毁活动星系核。
英文摘要：
We present the analysis of the Polycyclic Aromatic Hydrocarbon (PAH) spectra of a sample of 92 typical star forming galaxies at 0.03 < z < 0.2 observed with the Spitzer IRS. We compare the relative strengths of PAH emission features with SDSS optical diagnostics to probe the relationship between PAH grain properties and star formation and AGN activity. Short-to-long wavelength PAH ratios, and in particular the 7.7-to-11.3 micron feature ratio, are strongly correlated with the star formation diagnostics D_n(4000) and H-alpha equivalent width, increasing with younger stellar populations. This ratio also shows a significant difference between active and non-active galaxies, with the active galaxies exhibiting weaker 7.7 micron emission. A hard radiation field as measured by [OIII]/H-beta and [NeIII]_15.6/[NeII]_12.8 affects PAH ratios differently depending on whether this field results from starburst activity or an AGN. Our results are consistent with a picture in which larger PAH molecules grow more efficiently in richer media and in which smaller PAH molecules are preferentially destroyed by AGN.
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