Clowes-Campusano大型类星体群巡天：I. GALEX选择的z $\sim$ 1处的LBG样本
The Clowes-Campusano Large Quasar Group Survey: I. GALEX selected sample of LBGs at z$\sim$1
摘要：
大尺度星系结构的本质是当前星系形成模型的一个关键观测预测。SDSS和2dF星系巡天观测揭示了许多在40-150 h^-1 Mpc尺度上的低红移结构，有些甚至更大。为了限制高红移下大结构中的星系数密度、光度和恒星星族，我们研究了两个星系的片状结构，它们分别位于z=0.8和1.3，共动距离为150 h^-1 Mpc，嵌入在至少超过200 h^-1 Mpc的大型类星体群中。我们提出的第一个结果，这些片状结构使用两个连续的1度GALEX领域（FUV和NUV）交叉相关的光学数据从斯隆数字巡天（SDSS）的分析。我们得到一个样本的462莱曼Break星系（LBG）的候选人符合表。利用GALEX和SDSS数据，我们发现在静止坐标系波长范围内，LBG星系在z~1处的总平均光谱能量分布是平坦的（f_lambda），这意味着LBG中恒星的演化。从光度函数，我们得到的指示overdensities在两个LQG相比，他们的前景区域。从2点关联函数的计算中得出类似的结论，在1.6至4.8 Mpc的尺度上，z~0.8 LQG中的LBG显示出2 σ超密度，表明我们的LBG样品与z~3对应物具有类似的关联尺度。
英文摘要：
The nature of galaxy structures on large scales is a key observational prediction for current models of galaxy formation. The SDSS and 2dF galaxy surveys have revealed a number of structures on 40-150 h^-1 Mpc scales at low redshifts, and some even larger ones. To constrain galaxy number densities, luminosities, and stellar populations in large structures at higher redshift, we have investigated two sheet-like structures of galaxies at z=0.8 and 1.3 spanning 150 h^-1 comoving Mpc embedded in large quasar groups extending over at least 200 h^-1 Mpc. We present first results of an analysis of these sheet--like structures using two contiguous 1deg GALEX fields (FUV and NUV) cross-correlated with optical data from the Sloan Digital Sky Survey (SDSS). We derive a sample of 462 Lyman Break Galaxy (LBG) candidates coincident with the sheets. Using the GALEX and SDSS data, we show that the overall average spectral energy distribution of a LBG galaxy at z~1 is flat (in f_lambda) in the rest frame wavelength range from 1500A, to 4000A, implying evolved populations of stars in the LBGs. From the luminosity functions we get indications for overdensities in the two LQGs compared to their foreground regions. Similar conclusions come from the calculation of the 2-point correlation function, showing a 2sigma overdensity for the LBGs in the z~0.8 LQG on scales of 1.6 to 4.8 Mpc, indicating similar correlation scales for our LBG sample as their z~3 counterparts.
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