Cosmic Dawn and Reionization: Astrophysics in the Final Frontier

The cosmic dawn and epoch of reionization mark the time period in the universe when stars, galaxies, and blackhole seeds first formed and the intergalactic medium changed from neutral to an ionized one. Despite substantial progress with multi-wavelength observations, astrophysical process during this time period remain some of the least understood with large uncertainties on our existing models of galaxy, blackhole, and structure formation. This white paper outlines the current state of knowledge and anticipated scientific outcomes with ground and space-based astronomical facilities in the 2020s. We then propose a number of scientific goals and objectives for new facilities in late 2020s to mid 2030s that will lead to definitive measurements of key astrophysical processes in the epoch of reionization and cosmic dawn.

Matias Zaldarriaga | Jordan Mirocha | Aparna Venkatesan | Asantha Cooray | Hooshang Nayyeri | Matt Bradford | James Aguirre | Alexandra Pope | Hy Trac | Kiyoshi Masui | Jean-Gabriel Cuby | Lee Armus | Brant Robertson | Claudia Scarlata | Duncan Farrah | Stephen Serjeant | Roser Pello | Volker Bromm | Yacine Ali-Haimoud | Joanne Cohn | Steven Furlanetto | Bryna Hazelton | Ely Kovetz | Yin-Zhe Ma | Yi Mao | Matthew McQuinn | Benjamin Saliwanchik | Eli Visbal | Michael Zemcov | Marcelo Alvarez | Ruben Salvaterra | Jason Rhodes | Steven Finkelstein | Jingzhe Ma | James Rhoads | Anne Hutter | Mario G. Santos | Jack Burns | Pasquale Temi | Olivier Le Fevre | Andrea Ferrara | Caroline Heneka | Leon Koopmans | Adrian Liu | Tzu-Ching Chang | J. Rhodes | O. Fèvre | J. Cuby | C. Conselice | R. Pelló | S. Serjeant | Zheng Zheng | J. Bock | H. Trac | L. Koopmans | B. Robertson | D. Riechers | S. Finkelstein | J. Rhoads | S. Malhotra | M. Zaldarriaga | L. Armus | R. Chary | H. Chiang | D. Mortlock | E. Murphy | C. Scarlata | D. Marrone | F. Davies | O. Doré | M. Zemcov | R. Salvaterra | J. Aguirre | J. Bowman | S. Furlanetto | B. Hazelton | D. Jacobs | Adrian Liu | A. Parsons | D. Farrah | M. Bradford | A. Cooray | H. Nayyeri | A. Pope | E. Switzer | B. Saliwanchik | Jingzhe Ma | R. Bowler | P. Temi | P. Natarajan | V. Bromm | Yin-Zhe Ma | K. Masui | Tzu-Ching Chang | M. McQuinn | E. Kovetz | M. Alvarez | P. Breysse | A. Ferrara | Mario G Santos | E. Visbal | K. Caputi | J. Burns | M. Castellano | Y. Mao | A. Hutter | P. Dayal | G. Becker | P. Appleton | Zheng Zheng | Y. Ali-Haimoud | J. Cohn | J. Mirocha | Marta B. Silva | C. Heneka | Phil Appleton | George Becker | Jamie Bock | Rebecca Bowler | Judd Bowman | Patrick Breysse | Karina Caputi | Marco Castellano | Ranga Chary | Hsin Chiang | Chris Conselice | Frederick Davies | Pratika Dayal | Olivier Dore | Daniel Jacobs | Paul La Piante | Sangeeta Malhotra | Dan Marrone | Daniel Mortlock | Eric Murphy | Priya Natarajan | Thyagarajan Nithyanandan | Aaron Parsons | Dominik Riechers | Rafffaella Schneider | Marta Silva | Martin Sahl'en | Eric Switzer | A. Venkatesan | M. Sahl'en | Thyagarajan Nithyanandan | R. Schneider

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