论文标题
沿主序列的高红移类星体
High-redshift quasars along the Main Sequence
论文作者
论文摘要
我们旨在评估我们22个高红移（2.2 <z <3.7）和高发光度（47.39 <lbol <48.36）Quasars在4维征值1的背景下。我们的方法涉及通过uV和光学发射量诊断的光谱探索量词物理学研究量子物理学。我们正在使用ISAAC/VLT的新观测值，主要是从SDSS来覆盖光学和UV REST框架。发射线的表征是通过线轮廓的定量参数化，以及使用多组分拟合例程分解发射线轮廓。我们为HB+[O III]以及SI IV+O IV]，C IV+HE II和1900 Blend提供分光光度特性和线轮廓测量。在22个对象中，有6个在HB曲线上呈现出明显的蓝光成分，在14/22情况下，检测到与[O III]相关的HB流出成分。大多数[O III]发射线轮廓显示出大于250 km S^-1的蓝光速度。 [O III]和C IV Blueshifts显示出很高的振幅和高度的相关性。 [O III]和C IV的线宽度和移位均相关，这表明流出气体产生的发射正对这两种线提供了很大的扩展。否则，发现C IV质心速度在一半强度（C（1/2）），Eddington比率（L/LEDD）和降压仪之间的联系与以前的高亮度类星体的研究一致。我们的分析表明，整个主序列沿着主要序列的高光度的类星体的行为受到涉及各种空间尺度的强大外流的强烈影响。即使观察到系统宽度的系统增加，主序列相关性在高红移和高光度下仍然有效。基于UV AL III和HB排放线的缩放定律是MBH的同样可靠的估计量。
We aim to evaluate the behaviour of our 22 high-redshift (2.2 < z < 3.7) and high-luminosity (47.39 < Lbol < 48.36) quasars in the context of the 4-Dimensional Eigenvector 1. Our approach involves studying quasar physics through spectroscopic exploration of UV and optical emission line diagnostics. We are using new observations from ISAAC/VLT and mainly from the SDSS to cover the optical and the UV rest-frames, respectively. Emission lines are characterised both through a quantitative parametrisation of the line profiles, and by decomposing the emission line profiles using multicomponent fitting routines. We provide spectrophotometric properties and line profile measurements for Hb+[O iii], as well as for Si iv+O iv], C iv+He ii and the 1900 blend. Six out of the 22 objects present a significant blueshifted component on the Hb profile, and in 14/22 cases an Hb outflowing component associated to [O iii] is detected. The majority of [O iii] emission line profiles show blueshifted velocities larger than 250 km s^-1. [O iii] and C iv blueshifts show very high amplitudes and a high degree of correlation. Line width and shift are correlated for both [O iii] and C iv, suggesting that emission from outflowing gas is providing a substantial broadening to both lines. Otherwise, the links between C iv centroid velocity at half intensity (c(1/2)), Eddington ratio (L/LEdd), and bolometric luminosity are found to be in agreement with previous studies of high-luminosity quasars. Our analysis suggests that the behaviour of quasars of very high luminosity all along the main sequence is strongly affected by powerful outflows involving a broad range of spatial scales. The main sequence correlations remain valid at high redshift and high luminosity even if a systematic increase in line width is observed. Scaling laws based on UV Al iii and Hb emission lines are equally reliable estimators of MBH.
