标题： 从混沌介质中形成的金属吸收线光谱中测量动能温度 显示英文标题

标题： Measurability of kinetic temperature from metal absorption-line spectra formed in chaotic media

摘要： 我们提出了一种新方法，用于以10%的精度恢复介入稀薄气体的动力学温度。 该方法基于两种不同原子量物质的未饱和吸收线轮廓的比较。 假设这两种物质在吸收区域内的温度和整体运动相同。 计算技术涉及吸收轮廓的傅里叶变换以及随后的熵正则化卡方最小化[ERM]来估计模型参数。 该方法使用CII、SiII和FeII离子的合成光谱进行测试。 与标准的Voigt拟合分析进行了比较，并表明Voigt反卷积复杂吸收线轮廓可能导致非物理的温度估计。 我们还成功分析了Tytler {\it 等}在红移z = 3.572处观测到的类星体Q1937--1009方向上的CII1334和SiII1260线的凯克望远镜光谱。 显示英文摘要

摘要： We present a new method for recovering the kinetic temperature of the intervening diffuse gas to an accuracy of 10%. The method is based on the comparison of unsaturated absorption-line profiles of two species with different atomic weights. The species are assumed to have the same temperature and bulk motion within the absorbing region. The computational technique involves the Fourier transform of the absorption profiles and the consequent Entropy-Regularized chi^2-Minimization [ERM] to estimate the model parameters. The procedure is tested using synthetic spectra of CII, SiII and FeII ions. The comparison with the standard Voigt fitting analysis is performed and it is shown that the Voigt deconvolution of the complex absorption-line profiles may result in estimated temperatures which are not physical. We also successfully analyze Keck telescope spectra of CII1334 and SiII1260 lines observed at the redshift z = 3.572 toward the quasar Q1937--1009 by Tytler {\it et al.}.