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<p>Recent advances in astronomical observations have ushered in an era of remarkable discoveries. We now probe the universe through multi-messenger signals, image the sky with unprecedented depth and resolution, and investigate individual sources using powerful large-aperture telescopes. Yet, a critical gap persists: the lack of wide-field, highly multiplexed spectroscopic capabilities needed to fully exploit the wealth of imaging data from current and upcoming surveys. In this review, we trace the historical development of large optical telescopes and spectroscopic surveys, assess the capabilities of ongoing and near-future facilities, and motivate the need for next-generation Stage-V spectroscopic experiments. As a representative example, we present the multiplexed survey telescope (MUST)—the first Stage-V spectroscopic facility currently under construction. MUST is a 6.5-m telescope designed to obtain optical spectra for over 20000 targets simultaneously within a ∼5 deg<sup>2</sup> field, using a modular focal plane populated with 6.2-mm pitch fiber-positioning robots. Over an 8-year survey in the 2030s, MUST aims to build the most comprehensive 3D spectroscopic map of the universe to date, measuring redshifts for over 100 million galaxies and quasars and opening new windows into cosmology, Galactic structure, and time-domain astrophysics.</p>

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From large telescopes to the multiplexed survey telescope (MUST)

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Zheng Cai,
  • Song Huang,
  • Yu Liu,
  • Cheng Zhao,
  • Lei Huang

摘要

Recent advances in astronomical observations have ushered in an era of remarkable discoveries. We now probe the universe through multi-messenger signals, image the sky with unprecedented depth and resolution, and investigate individual sources using powerful large-aperture telescopes. Yet, a critical gap persists: the lack of wide-field, highly multiplexed spectroscopic capabilities needed to fully exploit the wealth of imaging data from current and upcoming surveys. In this review, we trace the historical development of large optical telescopes and spectroscopic surveys, assess the capabilities of ongoing and near-future facilities, and motivate the need for next-generation Stage-V spectroscopic experiments. As a representative example, we present the multiplexed survey telescope (MUST)—the first Stage-V spectroscopic facility currently under construction. MUST is a 6.5-m telescope designed to obtain optical spectra for over 20000 targets simultaneously within a ∼5 deg2 field, using a modular focal plane populated with 6.2-mm pitch fiber-positioning robots. Over an 8-year survey in the 2030s, MUST aims to build the most comprehensive 3D spectroscopic map of the universe to date, measuring redshifts for over 100 million galaxies and quasars and opening new windows into cosmology, Galactic structure, and time-domain astrophysics.