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首页> 外文期刊>The Astrophysical journal >THE ACTIVE GALACTIC NUCLEI CONTRIBUTION TO THE MID-INFRARED EMISSION OF LUMINOUS INFRARED GALAXIES
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THE ACTIVE GALACTIC NUCLEI CONTRIBUTION TO THE MID-INFRARED EMISSION OF LUMINOUS INFRARED GALAXIES

机译：主动星系核对夜红外星系中红外发射的贡献

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摘要

We determine the contribution of AGN to the mid-IR emission of luminous infrared galaxies (LIRGs) atz > 0.6 by measuring the mid-IR dust continuum slope of 20,039 mid-IR sources. The 24 μm sources are selected from a Spitzer MIPS survey of the NOAO Deep Wide-Field Survey Bootes field and have corresponding 8 μm data from the IRAC Shallow Survey. There is a clear bimodal distribution in the 24 to 8 μm flux ratio. The X-ray-detected sources fall within the peak corresponding to a flat spectrum in vf_v, implying that it is populated by AGN-dominated LIRGs, whereas the peak corresponding to a higher 24 to 8 μm flux ratio is likely due to LIRGs whose IR emission is powered by starbursts. The 24 μm emission is increasingly dominated by AGN at higher 24 μm flux densities (f_(24)): the AGN fraction of the z > 0.6 sources increases from 9% at f_(24) ≈ 0.35 mJy to 74% ± 20% at f_(24) ≈ 3 mJy, in good agreement with model predictions. Deep 24 μm, small-area surveys, like GOODS, will be strongly dominated by starburst galaxies. AGN are responsible for ～3%-7% of the total 24 μm background.
机译：通过测量20,039个中红外源的中红外尘埃连续谱斜率，我们确定AGN对发光红外星系（LIRGs）atz> 0.6的中红外发射的贡献。从NOAO深广域测量靴子场的Spitzer MIPS测量中选择了24μm辐射源，并从IRAC浅层测量获得了相应的8μm数据。在24至8μm的通量比中存在明显的双峰分布。检测到的X射线源落在与vf_v中的平坦光谱相对应的峰内，这表明它由AGN为主的LIRG占据，而对应于较高24至8μm通量比的峰可能是由于LIRG的IR发射由星爆驱动。在更高的24μm通量密度（f_（24））下，AGN越来越多地控制着24μm的发射：z> 0.6源的AGN分数从f_（24）≈0.35 mJy时的9％增加到74％±20％时的f f_（24）≈3 mJy，与模型预测非常吻合。像GOODS这样的深24μm小区域勘测将主要由星爆星系主导。 AGN占整个24μm背景的约3％-7％。

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