论文标题
在z $ \ sim $ 3 $ \ sim $ 3的sdss sdss j011852+040644的发现$ \ sim $ 3时发现了一个阻尼的$α$星系
Discovery of a damped Ly$α$ galaxy at z $\sim$ 3 towards the quasar SDSS J011852+040644
论文作者
论文摘要
我们报告了带有log n（hi）$ [\ rm cm^{ - 2}] $ = $ 21.0 \ pm 0.10 $ 0.10 $ at $ z \ z \ 3.0091 $的log n（hi）$ [hi）$ [hi）$ [hi）$ [hi）$ [hi）$ [hi）$ [hi）$ [hi）$α$系统的检测了（P200）望远镜。我们以3.3 $σ$的置信度在DLA槽的黑暗核心中检测到Ly $α$的排放，Ly $α$ luminosity $ l _ {\ rmlyα} $ $ $ \ rm =（3.8 \ pm 0.8 \ pm 0.8）\ times times times 10^{42}} {42}} \ erg \ erg \ s^$ 1} \ rm m _ {\ odot} \ yr^{ - 1} $（考虑到Ly $α$逃脱分数的下限$ f_ {ens c}^{lyα} \ sim 2 \％2 \％$）是这些Redshifts的Lyman Breakaxies典型的。相对于从金属吸收线衍生出的全身红移$ 281 \ pm 43 $ km/s的系统红移。相关的星系在非常小的冲击参数中的$ \ lyssim 12 \ rm \ kpc $来自背景类星体，这与光谱搜索中观察到的柱密度与影响参数之间观察到的反相关性一致，这些搜索追踪了DLA宿主星系的大规模环境。
We report the detection of the host galaxy of a damped Ly$α$ system (DLA) with log N(HI) $ [\rm cm^{-2}]$ = $21.0 \pm 0.10$ at $z \approx 3.0091$ towards the background quasar SDSS J011852+040644 using the Palomar Cosmic Web Imager (PCWI) at the Hale (P200) telescope. We detect Ly$α$ emission in the dark core of the DLA trough at a 3.3$σ$ confidence level, with Ly$α$ luminosity of $L_{\rm Lyα}$ $\rm = (3.8 \pm 0.8) \times 10^{42}\ erg\ s^{-1}$, corresponding to a star formation rate of $\gtrsim 2\ \rm M_{\odot}\ yr^{-1}$ (considering a lower limit on Ly$α$ escape fraction $f_{esc}^{Lyα} \sim 2\%$) as typical for Lyman break galaxies at these redshifts. The Ly$α$ emission is blueshifted with respect to the systemic redshift derived from metal absorption lines by $281 \pm 43$ km/s. The associated galaxy is at very small impact parameter of $\lesssim 12 \rm\ kpc$ from the background quasar, which is in line with the observed anticorrelation between column density and impact parameter in spectroscopic searches tracing the large-scale environments of DLA host galaxies.
