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We propose to obtain deep WFC3-UVIS FQ937N narrow band imaging of a sample of six quasars at zvirgul6.7 with extant high resolution ALMA sub-mm observations and deep optical-to-infrared spectra. These quasar fields will also be observed with deep JWST-NIRCam imaging in rest-frame UV (F115W and F200W) and optical (F356W) as well as slitless spectroscopy at 3-4 um to detect the Hbeta+CORCHETE_OPENOIIICORCHETE_CLOSE lines of galaxies in the quasar fields. The proposed HST observations will detect the Lyman alpha emission in zvirgul6.7 galaxies comma and together with the JWST observations and deep optical dropout band imaging comma will enable us to measure the distribution and the clustering of Lyman alpha emitters (LAEs) in the quasar vicinity and thus measure the dark matter halo mass of these earliest supermassive black holes (SMBHs). Compared with the distribution and clustering of more massive Hbeta+CORCHETE_OPENOIIICORCHETE_CLOSE emitters in quasar vicinity comma we will gain insights on how the strong quasar UV radiation affects the formation of galaxies at different masses. The HST narrow band observations will detect close companion galaxies and the extended Lyman alpha halos around the quasars to pinpoint whether the fast black hole growth are triggered by galaxy merger or cold stream accretion. The combination of the HST narrow band observations and JWST observations will also provide unparalleled measurements of the Lyman alpha emitting galaxy fraction and the distribution of the Lyman alpha line equivalent width and luminosity in the highly ionized quasar vicinity and constrain the reionization topology by comparing with such measurements in blank fields without strong ionization radiation from quasar and-or overdensity of galaxies.

我们计划对6个红移约为6.7（z≈6.7）的类星体样本开展深度WFC3-UVIS FQ937N窄带成像观测，这些样本已具备高分辨率ALMA亚毫米观测数据及深光学-红外光谱。这些类星体视场还将通过JWST-NIRCam进行静止帧紫外（F115W和F200W）及光学（F356W）深度成像，以及3-4微米的无狭缝光谱观测，以探测视场内星系的Hβ+[OIII]发射线。拟议的HST观测将捕捉z≈6.7星系的莱曼α（Lyman α）发射信号，结合JWST观测与深光学dropout带成像，可测量类星体周边莱曼α发射体（LAEs）的分布与聚类特征，进而推算这些早期超大质量黑洞（SMBHs）的暗物质晕质量。通过对比类星体周边质量更大的Hβ+[OIII]发射体的分布及聚类规律，我们将揭示强类星体紫外辐射对不同质量星系形成过程的影响机制。HST窄带观测还能探测类星体的近邻伴星系及延伸莱曼α晕，明确黑洞快速增长的触发机制（星系并合或冷流吸积）。HST窄带观测与JWST观测的结合，将为高电离类星体周边区域的莱曼α发射星系占比、莱曼α线等效宽度及光度分布提供前所未有的测量结果；通过与无强类星体电离辐射和/或星系过密的空白场区域的同类测量数据对比，可进一步约束再电离拓扑结构。