## Prof. Andrew Cooper and his group celebrate the first release of data from the Dark Energy Spectroscopic Instrument (Photo credits/ 圖片來源 : DESI Legacy Imaging Survey, D. Lang (Perimeter Institute) / NTHU)

The Dark Energy Spectroscopic Instrument (DESI) collaboration have made their first 2 million observations of stars and galaxies freely available for every astronomer in the world to explore. Led by the Lawrence Berkeley National Lab (LBNL) and funded by the US Department of Energy’s Office of Science, DESI is the most ambitious project yet undertaken to measure the scale of the universe.

In the DESI project, IoA Assistant Professor Andrew Cooper was one of the two leaders of the “DESI Milky Way Survey”. This team is analyzing DESI’s spectra of stars in the Milky Way galaxy to study galaxy evolution and the nature of dark matter. The first release of the DESI data includes approximately 500,000 stars, and the research findings of the Milky Way team have been published in the Astrophysical Journal.

The NTHU “Galactic Archaeology Team” led by Dr. Cooper has been involved in the DESI project for four years. The team working on DESI includes two doctoral students from the Institute of Astronomy, Namitha Kizhuprakkat from India and Li-wen Liao (廖俐雯), as well as Sy-yun Pu (蒲思云), an undergraduate in the Department of Physics.

Another research group in Taiwan led by Assistant Professor Ting-Wen Lan at NTU is also part of the DESI collaboration. More about Dr. Lan’s work on DESI can be found here: https://www.tingwenlan.com/news/desi-2023-edr-news

Full NTHU press release: https://www.nthu.edu.tw/hotNews/content/1134

More about DESI: https://www.desi.lbl.gov/

DESI Data Release: https://data.desi.lbl.gov

Milky Way Survey Overview: https://iopscience.iop.org/article/10.3847/1538-4357/acb3c0

暗能量光譜儀計畫DESI（Dark Energy Spectroscopic Instrument），14日與國際同步公布自2021年觀測至今的第一批共200萬筆天體光譜，免費提供全球天文學家使用與探索。這項史上最大的星系光譜觀測計畫由美國勞倫斯柏克萊國家實驗室（LBNL）主導，並由美國能源部科學辦公室資助，預計2025年將能觀測到超過4千萬個星系、1千萬顆恆星，包含銀河系中的恆星、遙遠的星系、及超大質量黑洞，繪製出有史以來最大、最詳盡的宇宙3D地圖。

在這項大型的跨國天文計畫中，古柏教授是其中「銀河系巡天計畫」（DESI Milky Way）團隊的兩位負責人之一，該團隊由30多位跨國天文學家組成，主要分析銀河系的恆星光譜。團隊這次公開了約50萬顆恆星的資料，研究成果也發表在《天文物理期刊》（Astrophysical Journal）。

由古柏教授領軍的本校「銀河系考古團隊」投入暗能量光譜儀計畫約4年，團隊成員包括印度籍的天文所博士生娜玫達（Namitha），以及博士生廖俐雯和物理系大三生蒲思云。

台灣參加國際暗能量光譜儀計畫的研究團隊除了本校的古柏教授，還包括另一位玉山青年學者──臺大天文物理研究所助理教授藍鼎文，更多關於藍鼎文教授的研究內容詳見：https://www.tingwenlan.com/news/desi-2023-edr-news

清華大學新聞: https://www.nthu.edu.tw/hotNews/content/1134

DESI計畫介紹: https://www.desi.lbl.gov/

暗能量光譜儀計畫(DESI)公開數據詳見：https://data.desi.lbl.gov/doc/

Milky Way Survey Overview: https://iopscience.iop.org/article/10.3847/1538-4357/acb3c0