MAMMOTH-Subaru IV. z=2.2-2.3处Lyα发射体与Lyα巨团的尺度结构和成团性分析
MAMMOTH-Subaru IV. Large Scale Structure and Clustering Analysis of Ly$α$ Emitters and Ly$α$ Blobs at $z=2.2-2.3$
AI总结：
本文利用Subaru/HSC数据研究z=2.2-2.3处LAEs和LABs的大尺度结构与成团性，发现LABs倾向位于过密区且亮LABs成团性更强，对应更大质量暗物质晕。
摘要：
我们报告了在z=2.2-2.3处Lyα发射体（LAEs）和Lyα巨团（LABs）的大尺度结构与成团性分析。利用昴星团望远镜/超广角主焦点相机（Subaru/Hyper Suprime-Cam）选出的3,341个LAEs、117个LABs和58个亮（Lyα光度L_Lyα>10^43.4 erg s^-1）LABs，我们计算了LAE过密度以研究z=2处的大尺度结构。我们表明79%的LABs和83%的亮LABs位于过密区域，这与先前研究发现LABs通常位于过密区域的趋势一致。我们发现我们8个天区中一个被称为J1349的天区包含我们LABs的39/117≈33%和亮LABs的22/58≈38%。一个独特的过密的24'×12'（40×20共动Mpc^2）区域（J1347原星系团）拥有12个LABs（8个亮LABs）。通过与SSA22（先前研究发现的最过密的LAB区域之一）比较，我们表明J1347原星系团区域比SSA22原星系团区域具有更高的亮LAB密度，显著性为1σ。我们计算了独特J1349天区中LAEs和LABs的角相关函数（ACFs），并用幂律函数拟合ACFs以测量斜率。亮LABs显示出大5σ的斜率，表明亮LABs比暗LAEs更加成团。我们的LABs具有约5-7的大星系偏袒因子，这表明LABs通常居住在比暗LAEs更大质量的暗物质晕（晕质量M≳10^13 M_⊙）中。
英文摘要：
We report the large scale structure and clustering analysis of Ly$α$ emitters (LAEs) and Ly$α$ blobs (LABs) at $z=2.2-2.3$. Using 3,341 LAEs, 117 LABs, and 58 bright (Ly$α$ luminosity $L_{\rm Lyα}>10^{43.4}$ erg s$^{-1}$) LABs at $z=2.2-2.3$ selected with Subaru/Hyper Suprime-Cam, we calculate the LAE overdensity to investigate the large scale structure at $z=2$. We show that $79\%$ LABs and $83\%$ bright LABs locate in overdense regions, which is consistent with the trend found by previous studies that LABs generally locate in overdense regions. We find that one of our 8 fields dubbed J1349 contains $39/117\approx33\%$ of our LABs and $22/58\approx38\%$ of our bright LABs. A unique and overdense $24'\times12'$ ($40\times20$ comoving Mpc$^2$) region (J1347 protocluster) has 12 LABs (8 bright LABs). By comparing to SSA22 that is one of the most overdense LAB regions found by previous studies, we show that the J1347 protocluster region has a higher bright LAB density than the SSA22 protocluster region with a $1σ$ significance. We calculate the angular correlation functions (ACFs) of LAEs and LABs in the unique J1349 field and fit the ACFs with a power-law function to measure the slopes. The bright LABs show a $5σ$ larger slope suggesting that bright LABs are more clustered than faint LAEs. Our LABs have a large galaxy bias of $\sim 5-7$, which suggests that LABs generally reside in more massive dark matter halos (halo masses $M \gtrsim 10^{13}$ M$_{\odot}$) than faint LAEs.
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