低红移$α$森林作为AGN反馈模型的约束
The low redshift Lyman-$α$ Forest as a constraint for models of AGN feedback
摘要：
利用Illustris和IllustrisTNG（TNG）宇宙学模拟，研究了$z=0.1$ Lyman- $α$ Forest观测量，如柱密度分布函数（CDD）、通量PDF、通量功率谱和线宽分布对活动星系核（AGN）反馈子网格模型的敏感性.这两个模拟共享相同的紫外线背景（UVB）处方和类似的宇宙学参数，但TNG具有完全重新设计的AGN反馈模型。由于活动星系核射电模模型的变化，在柱密度为$N_{\rm HI}< 10^{15.5}$ cm $^{-2}$时，原始的Illustris模拟中$α$吸收体比TNG少2-3倍。我们比较了模拟森林的统计数据，从宇宙起源光谱仪（COS）的紫外线数据，并发现，无论是模拟可以重现的吸收剂分布的斜率。这两个Illustris和TNG也产生显着较小的线宽分布比COS数据中观察到的。我们表明，TNG是在更好地与所观察到的$z=0.1$通量功率谱比Illustris协议。我们探讨统计数据可以解开活动星系核反馈的影响，从替代UVB模型通过重新调整的UVB的插图产生的CDD匹配TNG。虽然这种UVB重新缩放是退化的活动星系核反馈的CDD的效果，通量PDF和1D通量功率谱的幅度和形状的变化的方式不同的缩放的UVB。我们的研究表明，$z=0.1$莱曼- $α$森林观测值可以作为诊断活动星系核反馈模型。
英文摘要：
We study the sensitivity of the $z=0.1$ Lyman-$α$ Forest observables, such as the column density distribution function (CDD), flux PDF, flux power spectrum, and line width distribution, to sub-grid models of active galactic nuclei (AGN) feedback using the Illustris and IllustrisTNG (TNG) cosmological simulations. The two simulations share an identical Ultraviolet Background (UVB) prescription and similar cosmological parameters, but TNG features an entirely reworked AGN feedback model. Due to changes in the AGN radio mode model, the original Illustris simulations have a factor of 2-3 fewer Lyman-$α$ absorbers than TNG at column densities $N_{\rm HI}< 10^{15.5}$ cm$^{-2}$. We compare the simulated forest statistics to UV data from the Cosmic Origins Spectrograph (COS) and find that neither simulation can reproduce the slope of the absorber distribution. Both Illustris and TNG also produce significantly smaller line width distributions than observed in the COS data. We show that TNG is in much better agreement with the observed $z=0.1$ flux power spectrum than Illustris. We explore which statistics can disentangle the effects of AGN feedback from alternative UVB models by rescaling the UVB of Illustris to produce a CDD match to TNG. While this UVB rescaling is degenerate with the effect of AGN feedback on the CDD, the amplitude and shape of the flux PDF and 1D flux power spectrum change in a way distinct from a scaling of the UVB. Our study suggests that the $z=0.1$ Lyman-$α$ forest observables can be used as a diagnostic of AGN feedback models.
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