标题： 明亮莱曼断裂星系在$\mathbf{3 \lesssim z \lesssim 5}$的角相关函数 显示英文标题

标题： Angular correlation functions of bright Lyman-break galaxies at $\mathbf{3 \lesssim z \lesssim 5}$

摘要： 我们通过测量角两两点相关函数，研究了在COSMOS区域中红移3到$\lesssim z \lesssim$5范围内的Lyman-break星系的聚类情况。 我们的稳健样本包含$\sim$60,000个明亮的($m_{\rm UV}\lesssim 27$) Lyman-break星系，这些星系是基于跨越光学和近红外波长的14个光度带的光谱能量分布拟合选择的。 我们在最大分离距离为300角秒的情况下，限定了1-和2晕项，发现对应于$<20$ kpc尺度的相关函数存在过量，这与同一星系中的团块或该尺度上的相互作用有关。 然后我们对相关函数进行了贝叶斯模型拟合，以推断晕占有分布参数、恒星形成占空比和三个红移区间的星系偏置。 我们检查了多种不同参数组合变化的情况，表明我们的数据可以限制卫星占有函数的斜率，而之前的研究已经固定了该斜率。 对于一个$M_{\rm{UV}}$限制的子样本，我们发现星系偏移值为$b_g=3.18^{+0.14}_{-0.14}$在$z\simeq3$，$b_g=3.58^{+0.27}_{-0.29}$在$z\simeq4$，$b_g=4.27^{+0.25}_{-0.26}$在$z\simeq5$。 占空比值分别为$0.62^{+0.25}_{-0.26}$, $0.40^{+0.34}_{-0.22}$, 和 $0.39^{+0.31}_{-0.20}$。 这些结果表明，当红移增加时，在固定的静止框架紫外光度阈值下，宿主暗物质晕的质量略有减少，明亮星系中的恒星形成时间尺度也变短。 显示英文摘要

摘要： We investigate the clustering of Lyman-break galaxies at redshifts of 3 $\lesssim z \lesssim$ 5 within the COSMOS field by measuring the angular two-point correlation function. Our robust sample of $\sim$60,000 bright ($m_{\rm UV}\lesssim 27$) Lyman-break galaxies was selected based on spectral energy distribution fitting across 14 photometric bands spanning optical and near-infrared wavelengths. We constrained both the 1- and 2-halo terms at separations up to 300 arcsec, finding an excess in the correlation function at scales corresponding to $<20$ kpc, consistent with enhancement due to clumps in the same galaxy or interactions on this scale. We then performed Bayesian model fits on the correlation functions to infer the Halo Occupation Distribution parameters, star formation duty cycle, and galaxy bias in three redshift bins. We examined several cases where different combinations of parameters were varied, showing that our data can constrain the slope of the satellite occupation function, which previous studies have fixed. For an $M_{\rm{UV}}$-limited sub-sample, we found galaxy bias values of $b_g=3.18^{+0.14}_{-0.14}$ at $z\simeq3$, $b_g=3.58^{+0.27}_{-0.29}$ at $z\simeq4$, $b_g=4.27^{+0.25}_{-0.26}$ at $z\simeq5$. The duty cycle values are $0.62^{+0.25}_{-0.26}$, $0.40^{+0.34}_{-0.22}$, and $0.39^{+0.31}_{-0.20}$, respectively. These results suggest that, as the redshift increases, there is a slight decrease in the host halo masses and a shorter timescale for star formation in bright galaxies, at a fixed rest-frame UV luminosity threshold.