AGN的芳香特征：AGN主星系的成星红外光度函数
Aromatic Features in AGN: Star-Forming Infrared Luminosity Function of AGN Host Galaxies
摘要：
本文描述了PG、2 MASS和3CR三类天体在活动星系核中7.7和11.3 μ m处的芳香特征观测结果。该特征已被证明主要源于恒星形成。基于芳香族衍生的恒星形成光度，我们发现活动星系核的远红外辐射可以由恒星形成或核辐射主导;恒星形成的平均贡献在70和160 μ m处约为25%。三类活动星系核的恒星形成红外光度函数比场星系平坦，表明核活动和恒星形成有共同增强的趋势。恒星形成的光度函数也是从正常星系到明亮类星体的核活动强度的函数，随着核活动强度的增加，光度函数变得越来越平坦。不同类型的活动星系核在恒星形成活动水平上的分布不同，2 MASS> PG> 3CR。
英文摘要：
We describe observations of aromatic features at 7.7 and 11.3 um in AGN of three types including PG, 2MASS and 3CR objects. The feature has been demonstrated to originate predominantly from star formation. Based on the aromatic-derived star forming luminosity, we find that the far-IR emission of AGN can be dominated by either star formation or nuclear emission; the average contribution from star formation is around 25% at 70 and 160 um. The star-forming infrared luminosity functions of the three types of AGN are flatter than that of field galaxies, implying nuclear activity and star formation tend to be enhanced together. The star-forming luminosity function is also a function of the strength of nuclear activity from normal galaxies to the bright quasars, with luminosity functions becoming flatter for more intense nuclear activity. Different types of AGN show different distributions in the level of star formation activity, with 2MASS> PG> 3CR star formation rates.
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