The One-hundred-deg<sup>2</sup> DECam Imaging in Narrowbands (ODIN): Survey Design and Science Goals
Kyoung-Soo Lee, Eric Gawiser, Changbom Park, Yujin Yang, F. Valdés, Dustin Lang, Vandana Ramakrishnan, Byeongha Moon, Nicole Firestone, Stephen Appleby, M. Celeste Artale, Moira Andrews, F. E. Bauer, Barbara Benda, Adam Broussard, Yi-Kuan Chiang, Robin Ciardullo, Arjun Dey, Rameen Farooq, C. Gronwall, L. Guaita, Yun Huang, Ho Seong Hwang, Sang Hyeok Im, Woong-Seob Jeong, Shreya Karthikeyan, Hwihyun Kim, S.-L. Kim, Ankit Kumar, Gautam Nagaraj, Julie Nantais, Nelson Padilla, Jaehong Park, Alexandra Pope, Roxana Popescu, David J. Schlegel, Eunsuk Seo, Akriti Singh, Hyunmi Song, P. Troncoso, A. K. Vivas, Ann I. Zabludoff, A. Zenteno
Abstract
Abstract We describe the survey design and science goals for One-hundred-deg 2 DECam Imaging in Narrowbands (ODIN), a NOIRLab survey using the Dark Energy Camera (DECam) to obtain deep (AB ∼ 25.7) narrowband images over an unprecedented area of sky. The three custom-built narrowband filters, N 419, N 501, and N 673, have central wavelengths of 419, 501, and 673 nm and respective FWHM of 7.5, 7.6, and 10.0 nm, corresponding to Ly α at z = 2.4, 3.1, and 4.5 and cosmic times of 2.8, 2.1, and 1.4 Gyr, respectively. When combined with even deeper, public broadband data from the Hyper Suprime-Cam, DECam, and in the future, the Legacy Survey of Space and Time, the ODIN narrowband images will enable the selection of over 100,000 Ly α -emitting (LAE) galaxies at these epochs. ODIN-selected LAEs will identify protoclusters as galaxy overdensities, and the deep narrowband images enable detection of highly extended Ly α blobs (LABs). Primary science goals include measuring the clustering strength and dark matter halo connection of LAEs, LABs, and protoclusters, and their respective relationship to filaments in the cosmic web. The three epochs allow for the redshift evolution of these properties to be determined during the period known as Cosmic Noon, where star formation was at its peak. The narrowband filter wavelengths are designed to enable interloper rejection and further scientific studies by revealing [O ii ] and [O iii ] at z = 0.34, Ly α and He ii 1640 at z = 3.1, and Lyman continuum plus Ly α at z = 4.5. Ancillary science includes similar studies of the lower-redshift emission-line galaxy samples and investigations of nearby star-forming galaxies resolved into numerous [O iii ] and [S ii ] emitting regions.