{"paper":{"title":"New $z > 7$ Lyman-alpha Emitters in EGS: Evidence of an Extended Ionized Structure at $z \\sim 7.7$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(10) Univ. of Illinois, (11) LBNL/UC Berkeley, (12) CAB CSIC-INTA, (13) Univ. of Massachusetts, (14) Univ. of Cambridge, (15) MMT/Steward Observatory, (16) Steward Observatory, (17) NAOJ), (2) UT Austin, (3) NASA GSFC, (4) INAF - Osservatorio Astronomico di Roma, (5) Texas A&M Univ., (6) UC Irvine, (7) NSF's NOIARL, (8) Univ. of Louisville, (9) RIT, Amber N. Straughn (3), Anton M. Koekemoer (1), Benjamin J. Weiner (15), Benne W. Holwerda (8), Casey Papovich (5), Christopher N. A. Willmer (16), Henry C. Ferguson (1), Hyunbae Park (11), Intae Jung (1), Jeyhan S. Kartaltepe (9), Jorge A. Zavala (17) ((1) STScI, Laura Pentericci (4), Marco Castellano (4), Mark Dickinson (7), M. C. Cooper (6), Micaela B. Bagley (2), Mimi Song (13), Nikko J. Cleri (5), Pablo G. Perez-Gonzalez (12), Rebecca L. Larson (2), Sandro Tacchella (14), Seonwoo Kim (10), Steven L. Finkelstein (2), Taylor A. Hutchison (3)","submitted_at":"2022-12-19T20:46:51Z","abstract_excerpt":"We perform a ground-based near-infrared spectroscopic survey using the Keck/MOSFIRE spectrograph to target Ly$\\alpha$ emission at $7.0<z<8.2$ from 61 galaxies to trace the ionization state of the intergalactic medium (IGM). We cover a total effective sky area of $\\sim10^\\prime\\times10^\\prime$ in the Extended Groth Strip field of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. From our observations, we detect Ly$\\alpha$ emission at a $>$4$\\sigma$ level in eight $z>7$ galaxies, which include additional members of the known $z\\sim7.7$ Ly$\\alpha$-emitter (LAE) cluster (Tilvi et"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2212.09850","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2212.09850/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}