论文标题
宇宙中Si IV含量从电离时代到宇宙中午的演变
The evolution of the Si IV content in the Universe from the epoch of reionization to cosmic noon
论文作者
论文摘要
我们通过分析在147个类星体的高和中间分辨率光谱中检测到的近600个SIIV吸收系线的样品，研究了高红移间培养基和圆周与半乳酸培养基中金属的丰度和分布。 SIIV线的数量密度，柱密度分布函数和宇宙质量密度的演变以红移间隔为1.7 <= Z <= 6.2，对于log n（siiv）> = 12.5。所有数量均显示Z〜6和Z <5之间的迅速增加，然后与已经观察到的CIV吸收线已经观察到的Z〜2几乎恒定的行为。对于数值模拟，目前的结果是具有挑战性的：当模拟重现我们的SIIV结果时，它们倾向于低估CIV的性质，并且当复制CIV的性能时，强大的SIIV线的数量（log n（siiv）> 14）被过多预测。
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 SiIV absorption lines detected in high and intermediate resolution spectra of 147 quasars. The evolution of the number density of SiIV lines, the column density distribution function and the cosmic mass density are studied in the redshift interval 1.7 <= z <= 6.2 and for log N(SiIV) >= 12.5. All quantities show a rapid increase between z~6 and z< 5 and then an almost constant behaviour to z~2 in very good agreement with what is already observed for CIV absorption lines. The present results are challenging for numerical simulations: when simulations reproduce our SiIV results, they tend to underpredict the properties of CIV, and when the properties of CIV are reproduced, the number of strong SiIV lines (log N(SiIV) > 14) is overpredicted.
