A fresh look at AGN spectral energy distribution fitting with the XMM-SERVS AGN sample
A fresh look at AGN spectral energy distribution fitting with the XMM-SERVS AGN sample
复制标题
使用 XMM-SERVS AGN 样本重新审视 AGN 光谱能量分布拟合
DOI：
10.1093/mnras/stac1619
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发表时间：
2022
影响因子：
4.8
通讯作者：
Marshall A
中科院分区：
文献类型：
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作者：
Marshall A
利用XMM-SERVS中天体的10个波段的光学和红外光度数据，对711个0.7 <z< 4.5的活动星系核进行了光谱能量分布（SED）拟合。该拟合提供了510个关于活动星系核和宿主星系性质的可靠（减少χ2< 3）推论。由SED拟合得到的活动星系核光学（3000 μ m）光度与X射线（2-10 keV）光度的测量值有很好的相关性，与前人的工作结果一致。使用X射线硬度作为代理活动星系核的遮蔽，我们还研究了遮蔽和未遮蔽活动星系核的宿主星系属性的差异。这两个星系群都有一致的恒星质量（log 10（M*/M）= 10.88，对于无遮蔽和遮蔽的活动星系核，log 10（M*/M）= 10.8）。我们还发现，在18.8%的样本中，活动星系核发射线特性与标准活动星系核模板不同，χ2< 3，其中包含一个额外的发射线强度自由参数，以提高拟合的质量。这些适合SDSS光谱的比较表明，从宽波段光度法推断的发射线特性与91%的物体的光谱学结果一致。我们发现，从SED拟合中推断出的较弱的蓝移发射线的存在与αox的负值相关。虽然电离SED的硬度和发射线属性之间的相关性已经知道了一段时间，我们能够推导出这种相关性纯粹从宽带测光。
We perform spectral energy distribution (SED) fitting to 711 luminous X-ray AGN at 0.7 <z< 4.5 using 10-bands of optical and infra-red photometric data for objects within XMM-SERVS. This fitting provided 510 reliable (reduced χ2< 3) inferences on AGN and host galaxy properties. The AGN optical (3000 Å) luminosity inferred from SED-fitting is found to correlate with the measured X-ray (2–10 keV) luminosity, in good agreement with previous work. Using X-ray hardness as a proxy for AGN obscuration, we also study the differences in the host galaxy properties of obscured and unobscured AGNs. Both populations have consistent stellar masses (log10(M*/M⊙) = 10.88and log10(M*/M⊙) = 10.8for unobscured and obscured AGNs, respectively). We also find evidence for varying AGN emission line properties from a standard AGN template in 18.8 per cent of the sample with a reduced χ2< 3 where the inclusion of an additional emission line strength free parameter was found to improve the quality of the fit. Comparison of these fits to SDSS spectra showed that emission line properties inferred from broad-band photometry were consistent with the results from spectroscopy for 91 per cent of objects. We find that the presence of weaker, more blueshifted emission lines as inferred from the SED fits are associated with more negative values of αox. While the correlation between the hardness of the ionizing SED and the emission line properties has been known for some time, we are able to derive this correlation purely from broad-band photometry.