Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
Vandana Ramakrishnan
Byeongha Moon
Sang Hyeok Im
Rameen Farooq
Kyoung-Soo Lee
Eric Gawiser
Yujin Yang
Changbom Park
Ho Seong Hwang
Francisco Valdes
Maria Celeste Artale
Robin Ciardullo
Arjun Dey
Caryl Gronwall
Lucia Guaita
Woong-Seob Jeong
Nelson Padilla
Akriti Singh
Ann Zabludoff
Abstract： While many Lyman-alpha Blobs (LABs) are found in and around several well-known protoclusters at high redshift, how they trace the underlying large-scale structure is still poorly understood. In this work, we utilize 5,352 Lyman-alpha emitters (LAEs) and 129 LABs at z=3.1 identified over a $\sim$ 9.5 sq. degree area in early data from the ongoing One-hundred-deg$^2$ DECam Imaging in Narrowbands (ODIN) survey to investigate this question. Using LAEs as tracers of the underlying matter distribution, we identify overdense structures as galaxy groups, protoclusters, and filaments of the cosmic web. We find that LABs preferentially reside in regions of higher-than-average density and are located in closer proximity to overdense structures, which represent the sites of protoclusters and their substructures. Moreover, protoclusters hosting one or more LABs tend to have a higher descendant mass than those which do not. Blobs are also strongly associated with filaments of the cosmic web, with $\sim$ 70% of the population being within a projected distance of 2.4 pMpc from a filament. We show that the proximity of LABs to protoclusters is naturally explained by their association with filaments as large cosmic structures are where many filaments converge. The contiguous wide-field coverage of the ODIN survey allows us for the first time to firmly establish a connection between LABs as a population and their environment.
Peer Review Status:
Awaiting Review
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