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Studies of post-starburst galaxies that combine deep imaging and high-quality spectroscopy have led to an increased understanding of the relationship between merging comma structural transformation comma and quenching. Imaging allows for detailed structural studies of galaxies comma while optical spectra enable precise timing of the cessation of star formation the combination can distinguish between quenching mechanisms. However comma at z>1 comma when quenching of massive galaxies was much more common comma we still lack comprehensive datasets that provide both for the rare but crucial PSB population. We propose to create that data set with a WFC3-F110W SNAPSHOT program targeting virgul100 z>1 PSBs selected from the DESI Survey Validation sample of Luminous Red Galaxies. We will measure sizes comma identify merger rates comma and ultimately study the evolution of the population of recently quenched galaxies as a function of the time since quenching comma as derived from the spectra. Only by combining the resolution of HST with the deep spectra we have in hand can we reveal the conditions that led to quenching in these massive galaxies.

结合深度成像与高质量光谱学的后星暴星系（post-starburst galaxies）研究，已深化了对星系并合、结构转变与星形成猝灭（quenching）之间关系的理解。成像技术可用于星系的精细结构研究，而光学光谱能对星形成停止的时间进行精确测定——二者结合可区分不同的猝灭机制。然而，在z>1的红移区间（此时大质量星系的猝灭更为普遍），我们仍缺乏同时涵盖稀有但关键的后星暴星系（PSB，post-starburst galaxies）群体的综合数据集。我们计划通过WFC3-F110W快照（SNAPSHOT）项目构建该数据集，目标是从暗能量光谱仪（DESI）亮红星系（Luminous Red Galaxies）巡天验证样本中筛选出的约100个z>1的后星暴星系。我们将测量其尺寸、确定并合率，并最终研究近期猝灭星系群体的演化规律——该演化规律以光谱推导得出的猝灭时间为函数。唯有结合哈勃空间望远镜（HST）的分辨率与我们已掌握的深度光谱数据，方能揭示导致这些大质量星系猝灭的条件。