论文标题
盯着古星系的阴影：降低了$α$和金属吸收器，向年轻的$ z \ sim 6 $ feek-line quasar
Staring at the Shadows of Archaic Galaxies: Damped Ly$α$ and Metal Absorbers toward a Young $z \sim 6$ Weak-line Quasar
论文作者
论文摘要
我们将使用Gemini/gnirs，Magellan/Fire和VLT/Muse Data的数据表征了PSO J083+11的Ly $α$ HALO和吸收系统，这是一个独特的$ z = 6.3401 $ feal-Line quasar。在频谱中发现了氢和多种金属线（例如CII，MGII和OI）的强吸收，这表明存在：（i）$ Z = 6.314 $ $ z = 6.314 $ and（ii）$ z = 2.22305 $的$ z = 6.314 $ y $ z = 6.314 $ y $ z = 6.314 $ th in $ z = 6.314 $ py y $α$（sub-dla）系统。为了描述观察到的阻尼机翼信号，我们将$α$吸收与sub-dla的结合与中性氢柱密度结合使用，为$ \ log n_ \ mathrm {hi} = 20.03 \ pm 0.30 $ 0.30 $ cm $ $^{ - 2} $，从中性培养物中与中性菌株相比，含有较高的介质。对PSO J083+11的sub-dla的丰度比为[C/O] $ = -0.04 \ pm 0.33 $，金属度为[O/H] $ = -2.19 \ PM 0.44 $，类似于低红色的金属贫民状数Dlas。这些测量结果表明，Sub-DLA可能会截断PSO J083+11的接近区域大小并使类星体寿命测量复杂化。 However, this quasar shows no sign of a Ly$α$ halo in the MUSE data cube, where the estimated $1σ$ limit of surface brightness is $2.76 \times 10^{-18}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$ at aperture size of 1 arcsecond, or equivalent to a Ly$α$ luminosity $ \ leq 43.46 $ erg s $^{ - 1} $。这种非检索本身仅是弱独立证据，但至少与年轻的类星体场景一致，这对于具有短积分时间尺度的类星体所期望的。
We characterize the Ly$α$ halo and absorption systems toward PSO J083+11, a unique $z=6.3401$ weak-line quasar, using Gemini/GNIRS, Magellan/FIRE, and VLT/MUSE data. Strong absorptions by hydrogen and several metal lines (e.g., CII, MgII, and OI) are discovered in the spectrum, which indicates the presence of: (i) a proximate sub-damped Ly$α$ (sub-DLA) system at $z=6.314$ and (ii) a MgII absorber at $z=2.2305$. To describe the observed damping wing signal, we model the Ly$α$ absorption with a combination of a sub-DLA with the neutral hydrogen column density of $\log N_\mathrm{HI} = 20.03 \pm 0.30$ cm$^{-2}$ and absorption from the intergalactic medium with a neutral fraction of around 10 percent. The sub-DLA toward PSO J083+11 has an abundance ratio of [C/O] $=-0.04 \pm 0.33$ and metallicity of [O/H] $=-2.19 \pm 0.44$, similar to those of low-redshift metal-poor DLAs. These measurements suggest that the sub-DLA might truncate PSO J083+11's proximity zone size and complicate the quasar lifetime measurement. However, this quasar shows no sign of a Ly$α$ halo in the MUSE data cube, where the estimated $1σ$ limit of surface brightness is $2.76 \times 10^{-18}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$ at aperture size of 1 arcsecond, or equivalent to a Ly$α$ luminosity of $\leq 43.46$ erg s$^{-1}$. This non-detection, while being only weak independent evidence on its own, is at least consistent with a young quasar scenario, as expected for a quasar with a short accretion timescale.
