有效的长程AGN反馈影响低红移Lyman- $α$森林
Efficient long-range AGN feedback affects the low redshift Lyman-$α$ forest
摘要：
活动星系核（AGN）反馈模型通常被校准，以再现星系的观测值，如恒星质量函数和星系颜色的双峰性。我们使用各种各样的活动星系核反馈的实现在IllustrisTNG（TNG）和辛巴宇宙流体动力学模拟表明，低红移莱曼- $α$森林可以提供活动星系核反馈的影响的约束。我们表明，TNG过度预测的数密度的吸收柱密度$N_{\rm HI} < 10^{14}$厘米$^{-2}$相比，从宇宙起源摄谱仪的数据（与以前的工作一致），我们明确表明，其动力学反馈模式，这是主要负责星系淬火，有一个可以忽略不计的影响柱密度分布（CDD）的吸收体。相比之下，我们表明，基准辛巴模型，其中包括活动星系核喷流反馈是最好的适合所观察到的CDD的$z = 0.1$莱曼- $α$森林在5个数量级的列密度。我们表明，辛巴结果与射流产生一个定量更好的适合的观测数据比辛巴结果没有喷流，即使当UVB是一个自由参数。辛巴星系的活动星系核喷流是高速的、平行的、与星际介质弱相互作用（通过短暂的流体动力学解耦），并被加热到晕维里温度。总的来说，这些属性导致更强的长期影响IGM相比，TNG的动力学反馈模式，驱动各向同性风在银河系半径较低的速度。我们的研究结果表明，低红移莱曼- $α$森林提供了可信的证据远程AGN喷流反馈。
英文摘要：
Active galactic nuclei (AGN) feedback models are generally calibrated to reproduce galaxy observables such as the stellar mass function and the bimodality in galaxy colors. We use variations of the AGN feedback implementations in the IllustrisTNG (TNG) and Simba cosmological hydrodynamic simulations to show that the low redshift Lyman-$α$ forest can provide constraints on the impact of AGN feedback. We show that TNG over-predicts the number density of absorbers at column densities $N_{\rm HI} < 10^{14}$ cm$^{-2}$ compared to data from the Cosmic Origins Spectrograph (in agreement with previous work), and we demonstrate explicitly that its kinetic feedback mode, which is primarily responsible for galaxy quenching, has a negligible impact on the column density distribution (CDD) of absorbers. In contrast, we show that the fiducial Simba model which includes AGN jet feedback is the preferred fit to the observed CDD of the $z = 0.1$ Lyman-$α$ forest across five orders of magnitude in column density. We show that the Simba results with jets produce a quantitatively better fit to the observational data than the Simba results without jets, even when the UVB is left as a free parameter. AGN jets in Simba are high speed, collimated, weakly-interacting with the interstellar medium (via brief hydrodynamic decoupling) and heated to the halo virial temperature. Collectively these properties result in stronger long-range impacts on the IGM when compared to TNG's kinetic feedback mode, which drives isotropic winds with lower velocities at the galactic radius. Our results suggest that the low redshift Lyman-$α$ forest provides plausible evidence for long-range AGN jet feedback.
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