Aromatic Features in AGNs: Star-forming Infrared Luminosity Function of AGN Host Galaxies
Aromatic Features in AGNs: Star-forming Infrared Luminosity Function of AGN Host Galaxies
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DOI：
10.1086/521594
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发表时间：
2007-07
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影响因子：
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通讯作者：
Yong Shi;P. Ogle;G. Rieke;R. Antonucci;D. Hines;Paul S. Smith;F. Low;J. Bouwman;C. Willmer
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文献类型：
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作者：
Yong Shi;P. Ogle;G. Rieke;R. Antonucci;D. Hines;Paul S. Smith;F. Low;J. Bouwman;C. Willmer
本文描述了PG、2MASS和3CR三种类型agn在7.7和11.3 μm处的芳香特征。这一特征已被证明主要源于恒星形成。基于芳烃衍生的恒星形成光度，我们发现agn的远红外发射可能主要是恒星形成或核发射；在70 μm和160 μm范围内，恒星形成的平均贡献约为25%。三种类型agn的恒星形成红外光度函数比场星系更平坦，这意味着核活动和恒星形成倾向于同时增强。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，核活动越强烈，光度函数越平坦。不同类型的agn在恒星形成活动水平上表现出不同的分布，形成恒星的速率为2MASS > PG > 3CR。
We describe observations of aromatic features at 7.7 and 11.3 μm in AGNs 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 AGNs can be dominated by either star formation or nuclear emission; the average contribution from star formation is around 25% at 70 and 160 μm. The star-forming infrared luminosity functions of the three types of AGNs are flatter than those of field galaxies, implying that 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 AGNs show different distributions in the level of star formation activity, with 2MASS > PG > 3CR star formation rates.