z~5时QSO周围Lyman Break Galerkin和Lyman α辐射源的生境分离
The Habitat Segregation between Lyman Break Galaxies and Lyman alpha Emitters around a QSO at z~5
摘要：
我们对Z=4.87的类星体SDSS J 0211 -0009周围的莱曼破裂星系（LBG）和莱曼α发射体（LAEs）进行了目标巡天。深宽宽带和窄带成像同时揭示了这两个高z群体的透视结构。没有Ly-alpha辐射的LBG形成了一个包含类星体的平行结构，而LAE则分布在类星体周围，但在~4.5Mpc的距离内避开类星体。另一方面，我们意外地发现了一个原星系团，具有显著浓度的LBG和LAEs，其中没有强紫外电离源，如类星体或射电星系已知存在。在这个簇场中，两个种群在空间上相互交叉相关。LAEs与LBG的相对空间分布在类星体和星团场之间形成了鲜明的对比。我们还发现了一个微弱的趋势，表明在类星体场中LAEs的Ly-alpha和UV连续通量的计数略低于在集群场中，而LBG的计数几乎是一致的。LAE避开了类星体周围的附近区域，在那里，当地的紫外背景辐射可能比该时期的平均辐射强100倍。在类星体场中看到的LBG和LAEs之间的聚集分离可能是由于在过密环境中增强的早期星系形成导致所有LAEs演化为LBG，或者由于来自类星体的强紫外辐射有效地导致低质量星系（如LAEs）的不足而导致的局部光电离。
英文摘要：
We carried out a target survey for Lyman break galaxies (LBGs) and Lyman alpha emitters (LAEs) around QSO SDSS J0211-0009 at z=4.87. The deep and wide broadband and narrowband imaging simultaneously revealed the perspective structure of these two high-z populations. The LBGs without Ly-alpha emission form a filamentary structure including the QSO, while the LAEs are distributed around the QSO but avoid it within a distance of ~4.5Mpc. On the other hand, we serendipitously discovered a protocluster with a significant concentration of LBGs and LAEs where no strongly UV ionizing source such as a QSO or radio galaxy is known to exist. In this cluster field, two populations are spatially cross-correlated with each other. The relative spatial distribution of LAEs to LBGs is in stark contrast between the QSO and the cluster fields. We also found a weak trend showing that the number counts based on Ly-alpha and UV continuum fluxes of LAEs in the QSO field are slightly lower than in the cluster field, whereas the number counts of LBGs are almost consistent with each other. The LAEs avoid the nearby region around the QSO where the local UV background radiation could be ~100 times stronger than the average for the epoch. The clustering segregation between LBGs and LAEs seen in the QSO field could be due to either enhanced early galaxy formation in an overdense environment having caused all the LAEs to evolve into LBGs, or local photoionization due to the strong UV radiation from the QSO effectively causing a deficit in low-mass galaxies like LAEs.
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