Title: LBT IR observations of candidate super-Eddington quasars Show Chinese title

Title: 候选超爱丁顿类星体的LBT红外观测

Abstract: Quasars accreting at very high rates are believed to be prime movers of galactic evolution because of their high radiative and mechanical output. The study presented in this paper investigates a sample of six highly accreting quasars at redshifts \( z = 2-3 \) using near-infrared observations from the LUCI spectrograph at the Large Binocular Telescope (LBT). The aim is obtain a precise measure of the quasar systemic redshift and accretion parameters (black hole mass and Eddington ratio) primarily from the \hb\ line, \ and on second stance from other intermediate and low ionization lines. Outflow dynamical parameters (mass rate of outflowing gas, its kinetic power and momentum rate) were estimated from the \civ\ emission line that is perhaps the most easily accessible tracer of high-ionization winds from the accretion disk, obtained from the Sloan Digital Sky Survey. In addition, the joint analysis of the rest-frame optical and UV spectra allowed us to estimate the chemical composition of the broad line emitting gas. The high metal content of the outflowing gas ($Z \gtrsim 10 Z_\odot$) and the high values of thrust and kinetic power may induce a chemical feedback effect in the quasar host, in addition to mechanical feedback. Show Chinese abstract

Abstract: 被认为推动星系演化的首要因素是那些以非常高的速率吸积的类星体，因为它们具有很高的辐射和机械输出。 本文介绍的研究调查了六个红移为\( z = 2-3 \)的高度吸积的类星体样本，使用的是大型双筒望远镜 (LBT) 上 LUCI 光谱仪的近红外观测数据。 目标是主要通过\hb 谱线精确测量类星体的系统红移和吸积参数（黑洞质量和爱丁顿比），其次通过其他中间和低电离谱线。 从斯隆数字巡天获得的可能最容易探测到来自吸积盘高电离风的示踪剂——\civ 发射线，估计了外流动力学参数（外流气体的质量流率、动能功率和动量流率）。 此外，对静止框架下的光学和紫外光谱的联合分析使我们能够估算出宽线发射气体的化学成分。 外流气体（$Z \gtrsim 10 Z_\odot$）的高金属含量以及推力和动能功率的高值，除了机械反馈之外，还可能在类星体宿主星系中引发化学反馈效应。