Effect of separate initial conditions on the lyman-α forest in simulations

Effect of separate initial conditions on the lyman-α forest in simulations
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模拟中不同初始条件对 lyman-α 森林的影响

DOI:
10.1093/mnras/stab555
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发表时间:
2021
影响因子:
4.8
通讯作者:
Upton Sanderbeck, Phoebe
Upton Sanderbeck, Phoebe
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fernandez, M A;Bird, Simeon;Upton Sanderbeck, Phoebe

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利用一组高分辨率模拟,我们量化了物种特异性初始传递函数对通过Lyman-α森林的星系际介质(IGM)探测器的影响。我们关注电离后的2-6红移。我们探讨了这些初始条件对低密度IGM热态测量的影响:曲率、多普勒宽度截止和多普勒宽度分布。我们还研究了物质和通量功率谱,以及对热暗物质模型约束的潜在后果。我们发现曲率统计量在atz= 6时受影响最大。多普勒宽度截止参数受截距和拟合斜率的影响,尽管这对样本变化来说是次要的。多普勒宽度分布表现出atz= 3的效应,但分布与模拟箱尺寸和分辨率不完全收敛。高红移和小尺度对通量功率谱的影响最大。讨论了数值收敛与仿真参数的关系。
Using a set of high resolution simulations, we quantify the effect of species-specific initial transfer functions on probes of the intergalactic medium (IGM) via the Lyman-α forest. We focus on redshifts 2–6, after Hireionization. We explore the effect of these initial conditions on measures of the thermal state of the low density IGM: the curvature, Doppler width cutoff, and Doppler width distribution. We also examine the matter and flux power spectrum, and potential consequences for constraints on warm dark matter models. We find that the curvature statistic is at most affected at thelevel atz= 6. The Doppler width cutoff parameters are affected byfor the intercept, andfor the fit slope, though this is subdominant to sample variation. The Doppler width distribution shows aeffect atz= 3, however the distribution is not fully converged with simulation box size and resolution. The flux power spectrum is at most affected byat high redshift and small scales. We discuss numerical convergence with simulation parameters.
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