A SPectroscopic Survey of Biased Halos In the Reionization Era (ASPIRE): JWST Supports Earlier Reionization around [O III] Emitters
Journal
Date Issued
2024
Author(s)
Jin, Xiangyu
•
Yang, Jinyi
•
Fan, Xiaohui
•
Wang, Feige
•
Kakiichi, Koki
•
Meyer, Romain A.
•
Becker, George D.
•
Zou, Siwei
•
Bañados, Eduardo
•
Champagne, Jaclyn B.
•
•
Yue, Minghao
•
Bosman, Sarah E. I.
•
Cai, Zheng
•
Eilers, Anna-Christina
•
Hennawi, Joseph F.
•
Jun, Hyunsung D.
•
Li, Mingyu
•
Li, Zihao
•
Liu, Weizhe
•
Pudoka, Maria
•
Satyavolu, Sindhu
•
Sun, Fengwu
•
Tee, Wei Leong
•
Wu, Yunjing
Abstract
Understanding when and how reionization happened is crucial for studying the early structure formation and the properties of the first galaxies in the Universe. At z > 5.5, the observed intergalactic medium (IGM) optical depth shows a significant scatter, indicating an inhomogeneous reionization process. However, the nature of the inhomogeneous reionization remains debated. A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE) is a JWST Cycle 1 program that has spectroscopically identified >400 [O III] emitters in 25 quasar fields at z > 6.5. Combined with deep ground-based optical spectroscopy of ASPIRE quasars, the ASPIRE program provides the current largest sample for IGM-galaxy connection studies during cosmic reionization. We present the first results of IGM effective optical depth measurements around [O III] emitters using 14 ASPIRE quasar fields. We find the IGM transmission is tightly related to reionization era galaxies to the extent that a significant excess of Lyα transmission exists around [O III] emitters. We measure the stacked IGM effective optical depth of IGM patches associated with [O III] emitters and find they reach the same IGM effective optical depth at least d z ∼ 0.1 ahead of those IGM patches where no [O III] emitters are detected, supporting earlier reionization around [O III] emitters. Our results indicate an enhancement in IGM Lyα transmission around [O III] emitters at scales beyond 25 h ‑1 cMpc, consistent with the predicted topology of reionization from fluctuating UV background models.
Volume
976
Issue
1
Start page
93
Issn Identifier
0004-637X
Ads BibCode
2024ApJ...976...93J
Rights
open.access
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