Identifying the subtle signatures of feedback from distant AGN using ALMA observations and the EAGLE hydrodynamical simulations

Identifying the subtle signatures of feedback from distant AGN using ALMA observations and the EAGLE hydrodynamical simulations
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使用 ALMA 观测和 EAGLE 流体动力学模拟识别来自遥远活动星系核的反馈的微妙特征

DOI:
10.1093/mnras/stx3177
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发表时间:
2018
影响因子:
4.8
通讯作者:
Scholtz J
Scholtz J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Scholtz J

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本文介绍了我们的阿尔马计划在钱德拉深场-南方和宇宙演化巡天对114个活动星系核(AGN)进行的870 μm连续谱测量。我们利用这些观测资料,结合斯皮策和赫歇尔的观测资料,构造了一个86个X射线选择的活动星系核样本,63个具有阿尔马约束条件的活动星系核样本,在z = 1.5-3.2范围内,恒星质量大于2 × 10 ~(10)M ~(10)M ~(10)。我们构造了红外波段(8-1000 μm)的宽波段光谱能量分布和未受活动星系核污染的恒星形成率(SFR)。使用分层贝叶斯方法,考虑到上限的信息,我们适合SFR和特定的SFR(sSFR)分布。我们探讨这些分布作为一个函数的X射线光度和恒星质量。我们比较我们的测量结果的两个版本的演化和组装的银河系及其环境(EAGLE)流体动力学模拟:AGN反馈的参考模型和模型没有AGN。我们发现观测结果与EAGLE参考模型预测的sSFR分布的模式和宽度作为X射线光度和恒星质量的函数之间存在很好的一致性;然而,我们发现,与数据相比,没有AGN反馈的EAGLE模型预测的宽度要窄得多。总的来说,从观测结果和模型预测的结合,我们得出结论:(1)即使有活动星系核反馈,我们预计sSFR分布参数和活动星系核瞬时光度之间也没有很强的关系;(2)活动星系核反馈的特征是所有恒星质量超过1010 M <$m的星系(不仅仅是活动星系核所在的星系)sSFR的广泛分布。
We present sensitive 870 μm continuum measurements from our ALMA programmes of 114 X-ray selected active galactic nuclei (AGN) in theChandraDeep Field-South and Cosmic Evolution Survey fields. We use these observations in combination with data fromSpitzerandHerschelto construct a sample of 86 X-ray selected AGN, 63 with ALMA constraints atz= 1.5–3.2 with stellar mass >2 × 1010M⊙. We constructed broad-band spectral energy distributions in the infrared band (8–1000 μm) and constrain star-formation rates (SFRs) uncontaminated by the AGN. Using a hierarchical Bayesian method that takes into account the information from upper limits, we fit SFR and specific SFR (sSFR) distributions. We explore these distributions as a function of both X-ray luminosity and stellar mass. We compare our measurements to two versions of the Evolution and Assembly of GaLaxies and their Environments (EAGLE) hydrodynamical simulations: the reference model with AGN feedback and the model without AGN. We find good agreement between the observations and that predicted by the EAGLE reference model for the modes and widths of the sSFR distributions as a function of both X-ray luminosity and stellar mass; however, we found that the EAGLE model without AGN feedback predicts a significantly narrower width when compared to the data. Overall, from the combination of the observations with the model predictions, we conclude that (1) even with AGN feedback, we expect no strong relationship between the sSFR distribution parameters and instantaneous AGN luminosity and (2) a signature of AGN feedback is a broad distribution of sSFRs for all galaxies (not just those hosting an AGN) with stellar masses above ≈1010M⊙.
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