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arxiv: 2304.11188 · v1 · pith:5BOGGLDUnew · submitted 2023-04-21 · 🌌 astro-ph.HE · astro-ph.GA· astro-ph.IM

Key Science Goals for the Next-Generation Event Horizon Telescope

Michael D. Johnson , Kazunori Akiyama , Lindy Blackburn , Katherine L. Bouman , Avery E. Broderick , Vitor Cardoso , R. P. Fender , Christian M. Fromm
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Peter Galison Jos\'e L. G\'omez Daryl Haggard Matthew L. Lister Andrei P. Lobanov Sera Markoff Ramesh Narayan Priyamvada Natarajan Tiffany Nichols Dominic W. Pesce Ziri Younsi Andrew Chael Koushik Chatterjee Ryan Chaves Juliusz Doboszewski Richard Dodson Sheperd S. Doeleman Jamee Elder Garret Fitzpatrick Kari Haworth Janice Houston Sara Issaoun Yuri Y. Kovalev Aviad Levis Rocco Lico Alexandru Marcoci Niels C.M. Martens Neil M. Nagar Aaron Oppenheimer Daniel C. M. Palumbo Angelo Ricarte Mar\'ia J. Rioja Freek Roelofs Ann C. Thresher Paul Tiede Jonathan Weintroub Maciek Wielgus
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classification 🌌 astro-ph.HE astro-ph.GAastro-ph.IM
keywords blackscienceeventgoalsholehorizonnext-generationngeht
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The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way. Proposed upgrades to this array through the next-generation EHT (ngEHT) program would sharply improve the angular resolution, dynamic range, and temporal coverage of the existing EHT observations. These improvements will uniquely enable a wealth of transformative new discoveries related to black hole science, extending from event-horizon-scale studies of strong gravity to studies of explosive transients to the cosmological growth and influence of supermassive black holes. Here, we present the key science goals for the ngEHT and their associated instrument requirements, both of which have been formulated through a multi-year international effort involving hundreds of scientists worldwide.

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