论文标题
探测使用金属吸收与类星体相关的大规模紫外线背景不均匀性
Probing Large-scale UV Background Inhomogeneity Associated with Quasars using Metal Absorption
论文作者
论文摘要
我们研究了与高红移时观察到的类星体种群相关的三维中的大规模紫外线背景不均匀性。我们通过通过类星体吸收频谱堆叠来测量金属吸收作为与SDSS-IV/eBoss最接近的近距离级别的巨型鳞片量表的功能距离。我们研究了OVI，C IV和SI IV和SI III中的层间培养基吸收剂和混合伴生的培养基吸收剂和探针吸收剂。总体而言，更强大的高电离物种吸收距离价格更接近类星体，价格为$ 2.4 <z <3.1 $。 O VI的吸收显示出特别强烈的变化，在某些情况下在C IV中的影响，在SI III和SI IV中的边际影响更大。我们进一步研究$ 2.05 <z <2.4 $（随着时间的推移而增加同质性的迹象较弱），并探索金属吸收作为综合SDSS-R带磁通通量的函数的函数（产生一致但不太重要的结果）。虽然金属吸收确实显示出对大规模3D类星体接近性的敏感性，但当前的不完全的类星体样品限制了详细解释。然而，这项工作确实表明，在几个10s的com comovers com com com com com com com的范围内存在紫外线背景不均匀性，并且可以通过在乳半型培养基中检查金属吸收来精确测量它们。
We study large-scale UV background inhomogeneity in three-dimensions associated with the observed quasar populations at high redshift. We do this by measuring metal absorption through quasar absorption spectrum stacking as a function distance to closest quasar in SDSS-IV/eBOSS on 10s of comoving megaparsec scales. We study both intergalactic medium absorbers and mixed circumgalactic medium absorbers and probe absorption in O VI, C IV, and Si IV, and Si III. Overall stronger high ionization species absorption is seen closer to quasars at $2.4<z<3.1$. O VI absorption shows a particularly strong change, with effects in C IV evident in some cases, and more marginal effects in Si III and Si IV. We further study $2.05<z<2.4$ (with weak signs of increasing homogeneity with time) and explore the study of metal absorption as a function of integrated SDSS-r band flux quasar flux (yielding consistent but less significant results). While the metal absorption does show sensitivity to large-scale 3D quasar proximity, the current incomplete quasar samples limit detailed interpretation. This work does, however, demonstrate that UV background inhomogeneities exist on scales of several 10s of comoving megaparsecs associated with quasars and that they can be measured with precision by examining metal absorption in the intergalactic medium.
