Paper: COSMOS-Web: An Overview of the JWST Cosmic Origins Survey
Authors: Caitlin M. Casey, Jeyhan S. Kartaltepe, Nicole E. Drakos, Maximilien Franco, Santosh Harish, Louise Paquereau, Olivier Ilbert, Caitlin Rose, Isabella G. Cox, James W. Nightingale, Brant E. Robertson, John D. Silverman, Anton M. Koekemoer, Richard Massey, Henry Joy McCracken, Jason Rhodes, Hollis B. Akins, Natalie Allen, Aristeidis Amvrosiadis, Rafael C. Arango-Toro, Micaela B. Bagley, Angela Bongiorno, Peter L. Capak, Jaclyn B. Champagne, Nima Chartab, Óscar A. Chávez Ortiz, Katherine Chworowsky, Kevin C. Cooke, Olivia R. Cooper, Behnam Darvish, Xuheng Ding, Andreas L. Faisst, Steven L. Finkelstein, Seiji Fujimoto, Fabrizio Gentile, Steven Gillman, Katriona M. L. Gould, Ghassem Gozaliasl, Christopher C. Hayward, Qiuhan He, Shoubaneh Hemmati, Michaela Hirschmann, Knud Jahnke, Shuowen Jin, Ali Ahmad Khostovan, Vasily Kokorev, Erini Lambrides, Clotilde Laigle, Rebecca L. Larson, Gene C. K. Leung, Daizhong Liu, Tobias Liaudat, Arianna S. Long, Georgios Magdis, Guillaume Mahler, Vincenzo Mainieri, Sinclaire M. Manning, Claudia Maraston, Crystal L. Martin, Jacqueline E. McCleary, Jed McKinney, Conor J. R. McPartland, Bahram Mobasher, Rohan Pattnaik, Alvio Renzini, R. Michael Rich, David B. Sanders, Zahra Sattari, Diana Scognamiglio, Nick Scoville, Kartik Sheth, Marko Shuntov, Martin Sparre, Tomoko L. Suzuki, Margherita Talia, Sune Toft, Benny Trakhtenbrot, C. Megan Urry, Francesco Valentino, Brittany N. Vanderhoof, Eleni Vardoulaki, John R. Weaver, Katherine E. Whitaker, Stephen M. Wilkins, Lilan Yang, Jorge A. Zavala
Figure caption: At left are two snapshots of a cosmological n-body simulation performed using GADGET-2 (Springel 2005) spanning a (100 h−1 Mpc)3 volume (not the real COSMOS survey field). The cube is projected here from one side and has a thickness equivalent to δ z = 0.5 at z = 7 and δ z = 0.7 at z = 9. The underlying dark matter distribution is shown in blue (void indicated by darker blue), and the distribution of ionized hydrogen gas (H+) is shown in pink, whereas regions of neutral IGM have the underlying blue dark matter distribution visible. Galaxies that are detectable in COSMOS-Web are shown as white points (having F150W < 27.5). Larger points represent more luminous (with F150W < 26.5) galaxies. At right, we show the recovered galaxy density maps inferred from the same simulation snapshots using the observational limits of our survey. The recovered maps use an adaptive kernel smoothing on a global 5 Mpc kernel scale (Darvish et al. 2015) and include a modeling of sources’ incompleteness and photometric redshift uncertainties, demonstrating our ability to recover large-scale structure at these redshifts. The galaxies responsible for reionization may be expected to be strongly clustered on 30–100 cMpc (10′–40′) scales, much larger than all existing contiguous NIR Hubble deep surveys and other planned Cycle 1 JWST surveys. COSMOS-Web will span an area the size of the white box, about (46′)2, and will cover a mix of 4–16 independent reionization bubbles or neutral gas regions per dz = 0.3 slice across 12 independent slices. With ∼5000 sources detectable across 6 < z < 8 and ∼600 sources at 8 < z < 10, COSMOS-Web will be uniquely situated to gathering statistical samples of EoR density environments. Further follow-up observations in Lyα may then reveal the relationship between mass overdensities and ionized bubbles.