Probing the He ii re-Ionization ERa via Absorbing C iv Historical Yield (HIERACHY). II. Project Design, Current Status, and Examples of Initial Data Products
Article Swipe
Jiangtao Li
,
Xiaodi Yu
,
Huiyang Mao
,
Hanxiao Chen
,
Tiancheng Yang
,
Zhijie Qu
,
Fuyan Bian
,
Joel N. Bregman
,
Zheng Cai
,
Xiaohui Fan
,
Taotao Fang
,
Ji Li
,
Zhiyuan Ji
,
Sean D. Johnson
,
Guoliang Li
,
Weizhe Liu
,
Ying-Yi Song
,
Feige Wang
,
Tao Wang
,
Xin Wang
,
Christina Williams
,
Mingxuan Xu
,
Jinyi Yang
,
Yang Yang
,
Xianzhong Zheng
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/adc89d
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/adc89d
The He ii reionization epoch is expected to take place at z ∼ 3–5. In this stage, the helium and metals in the intergalactic medium are further ionized with additional contributions from harder nonstellar sources, and some large-scale gravitationally bound systems approach virialization. The Probing the He ii re-Ionization ERa via Absorbing C iv Historical Yield (HIERACHY) program utilizes high- and medium-resolution spectra of bright background quasars at z ≈ 3.9–5.2 to investigate Ly α , C iv , and other metal absorption lines during this epoch. Additionally, we employ narrowband imaging to search for Ly α emitters associated with C iv absorbers, alongside multiwavelength observations to identify and study particularly intriguing cases. In this paper, we present the design of the HIERACHY program, its current status, major scientific goals, and examples of initial data products from completed Magellan/MIKE, MagE spectroscopy, and MDM imaging observations. We also provide a brief outlook on future multiwavelength observations that may significantly impact the related science.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3847/1538-4357/adc89d
- OA Status
- gold
- Cited By
- 2
- References
- 172
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4410497663
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4410497663Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3847/1538-4357/adc89dDigital Object Identifier
- Title
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Probing the He
ii re-Ionization ERa via Absorbing Civ Historical Yield (HIERACHY). II. Project Design, Current Status, and Examples of Initial Data ProductsWork title - Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-05-15Full publication date if available
- Authors
-
Jiangtao Li, Xiaodi Yu, Huiyang Mao, Hanxiao Chen, Tiancheng Yang, Zhijie Qu, Fuyan Bian, Joel N. Bregman, Zheng Cai, Xiaohui Fan, Taotao Fang, Ji Li, Zhiyuan Ji, Sean D. Johnson, Guoliang Li, Weizhe Liu, Ying-Yi Song, Feige Wang, Tao Wang, Xin Wang, Christina Williams, Mingxuan Xu, Jinyi Yang, Yang Yang, Xianzhong ZhengList of authors in order
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https://doi.org/10.3847/1538-4357/adc89dPublisher landing page
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.3847/1538-4357/adc89dDirect OA link when available
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Physics, Yield (engineering), Ionization, Current (fluid), Ion, Thermodynamics, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
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2Total citation count in OpenAlex
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2025: 2Per-year citation counts (last 5 years)
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172Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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