The evolution of the Si iv content in the Universe from the epoch of reionization to cosmic noon
The evolution of the Si iv content in the Universe from the epoch of reionization to cosmic noon
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从再电离时代到宇宙正午时期宇宙中Siâiv含量的演变
DOI：
10.1093/mnras/stac545
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发表时间：
2022
影响因子：
4.8
通讯作者：
Lopez, S.
中科院分区：
文献类型：
--
作者：
D’Odorico, V.;Finlator, K.;Cristiani, S.;Cupani, G.;Perrotta, S.;Calura, F.;Cènturion, M.;Becker, G.;Berg, T. A. M.;Lopez, S.
通过对147个类星体的高、中分辨率光谱中近600条Siiv吸收线的分析，研究了高红移星系际介质和环星系介质中金属元素的丰度和分布。本文研究了在红移区间1.7 μ z <$6.2和logN（Siiv）≥ 12.5时，Siiv线数密度、柱密度分布函数和宇宙质量密度的演化。所有的量都显示出在z = 6和z = 5之间的快速增加，然后在z = 2处的几乎恒定的行为，与已经观察到的Civ吸收线非常一致。目前的结果是具有挑战性的数值模拟：当模拟重现我们的Siiv结果，他们往往低估的性质Civ，和Civare的性质重现时，强Siiv线的数量[logN（Siiv）> 14]是高估。
We investigate the abundance and distribution of metals in the high-redshift intergalactic medium and circum-galactic medium through the analysis of a sample of almost 600 Siivabsorption lines detected in high- and intermediate-resolution spectra of 147 quasars. The evolution of the number density of Siivlines, the column density distribution function, and the cosmic mass density are studied in the redshift interval 1.7 ≲z≲ 6.2 and for logN(Siiv) ≥ 12.5. All quantities show a rapid increase betweenz∼ 6 andz≲ 5 and then an almost constant behaviour toz∼ 2 in very good agreement with what is already observed for Civabsorption lines. The present results are challenging for numerical simulations: When simulations reproduce our Siivresults, they tend to underpredict the properties of Civ, and when the properties of Civare reproduced, the number of strong Siivlines [logN(Siiv) > 14] is overpredicted.