FAR-INFRARED AND ACCRETION LUMINOSITIES OF THE PRESENT-DAY ACTIVE GALACTIC NUCLEI
FAR-INFRARED AND ACCRETION LUMINOSITIES OF THE PRESENT-DAY ACTIVE GALACTIC NUCLEI
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DOI：
10.1088/0004-637x/807/1/28
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发表时间：
2015-05
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影响因子：
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通讯作者：
K. Matsuoka;J. Woo
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文献类型：
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作者：
K. Matsuoka;J. Woo
利用AKARI和Herschel的远红外巡天观测数据，研究了492个2型活动星系核（AGN）的z轴光度与星星形成（SF）和黑洞吸积光度之间的关系.我们采用90和100 μm的远红外光度作为SF光度，假设星星形成速率与远红外光度呈线性关系。由[Oiii]λ5007和[Oi]λ6300谱线估算活动星系核的光度，发现在很宽的动力学范围内，远红外线和活动星系核的光度之间存在正的线性关系。这一结果似乎与最近的报道不一致，即低光度活动星系核显示FIR和X射线光度之间基本上没有相关性，而这种差异可能是由于Malmquist和样本选择偏差。通过分析光谱能量分布，我们发现，纯活动星系核候选者，其中远红外辐射被认为是活动星系核占主导地位，显示出显着的低SF活动。这些由低SF星系承载的AGN在我们的样本中是罕见的（101%？> ).然而，低SF活动星系核的低比例可能是由于观测的局限性，因为最近的FIR调查是不足以检查人口的高光度活动星系核托管的低SF星系。
We investigate the relation between star formation (SF) and black hole accretion luminosities, using a sample of 492 type-2 active galactic nuclei (AGNs) at z , which are detected in the far-infrared (FIR) surveys with AKARI and Herschel. We adopt FIR luminosities at 90 and 100 μm as SF luminosities, assuming the proposed linear proportionality of star formation rate with FIR luminosities. By estimating AGN luminosities from [O iii]λ5007 and [O i]λ6300 emission lines, we find a positive linear trend between FIR and AGN luminosities over a wide dynamical range. This result appears to be inconsistent with the recent reports that low-luminosity AGNs show essentially no correlation between FIR and X-ray luminosities, while the discrepancy is likely due to the Malmquist and sample selection biases. By analyzing the spectral energy distribution, we find that pure-AGN candidates, of which FIR radiation is thought to be AGN-dominated, show significantly low-SF activities. These AGNs hosted by low-SF galaxies are rare in our sample ( ∼ 1 % ?> ). However, the low fraction of low-SF AGNs is possibly due to observational limitations since the recent FIR surveys are insufficient to examine the population of high-luminosity AGNs hosted by low-SF galaxies.