论文标题
与Lyman $α$ Forest吸收星系的互相关
The cross-correlation of galaxies in absorption with the Lyman $α$ forest
论文作者
论文摘要
我们通过测量其与Lyman $α$ forest的互相关来介绍了强混合Lyman $α$(SBLA)吸收系统的第一个聚类测量。 SBLA是在Lyman $α$森林中发现的新吸收商。我们发现$ 2.329 \ pm0.057 $的偏见与阻尼的Lyman $α$吸收器(DLAS)一致。对于DLA,我们收回了$ 2.331 \ pm0.057 $的偏见,比以前报道的大(Pérez-ràfols等人,2018b)。我们还发现红移空间失真参数$β= 0.417 \ pm0.010 $,也与DLA的恢复值一致($β= 0.416 \ pm0.010 $)。这与SBLA和DLA系统一致,这些系统追踪了广泛的星系群体的环境培养基的不同部分。鉴于这些常见的聚类特性,我们将它们组合在一起,以吸收星系的互相关,以吸收ly $α$森林。我们发现,这种新测量值的BAO量表不确定性为$ 1.75 \ times $ $α$自动相关的$ $α$ $ 1.6 \ times $ $ $ ly $α$ forest。我们注意到,当前的首选金属污染模型用于拟合相关函数相对于Ly $α$森林的相关函数对于SBLA系统而言是不够现实的,这可能是由于其状态是高金属富集的高红移精度位点。需要包括SBLA系统及其相关金属吸收的模拟光谱才能充分了解该样品。我们得出的结论是,SBLA有可能在未来的调查中补充标准的$α$宇宙学分析。
We present the first clustering measurement of Strong Blended Lyman $α$ (SBLA) absorption systems by measuring their cross-correlation with the Lyman $α$ forest. SBLAs are a new population of absorbers detected within the Lyman $α$ forest. We find a bias of $2.329\pm0.057$, consistent with that of Damped Lyman $α$ absorbers (DLAs). For DLAs, we recover a bias of $2.331\pm0.057$ larger than previously reported (Pérez-Ràfols et al. 2018b). We also find a redshift space distortion parameter $β=0.417\pm0.010$, also consistent with the recovered value for DLAs ($β=0.416\pm0.010$). This is consistent with SBLA and DLA systems tracing different portions of the circumgalactic medium of a broadly common population of galaxies. Given these common clustering properties, we combined them to perform a cross-correlation of galaxies in absorption with the Ly$α$ forest. We find that the BAO scale uncertainty of this new measurement is $1.75\times$ that of Ly$α$ auto-correlation and $1.6\times$ that of the quasar cross-correlation with the Ly$α$ forest. We note that the current preferred metal contamination model for fitting the correlation functions with respect to the Ly$α$ forest is not realistic enough for SBLA systems, likely due to their status as high redshift precision sites of high metal enrichment. Mock spectra including SBLA systems and their associated metal absorption are required to understand this sample fully. We conclude that SBLAs have the potential to complement the standard Ly$α$ cosmological analyses in future surveys.