The JWST/PASSAGE Survey: Testing Reionization Histories with JWST’s First Unbiased Survey for Lyα Emitters at Redshifts 7.5–9.5 Article Swipe
Axel Runnholm
,
Matthew Hayes
,
Vihang Mehta
,
Matthew A. Malkan
,
Claudia Scarlata
,
K. Nedkova
,
Marc Rafelski
,
Benedetta Vulcani
,
Mason Huberty
,
E. C. Herenz
,
Anne Hutter
,
S Bruton
,
Ayan Acharyya
,
Hakim Atek
,
Ivano Baronchelli
,
Andrew Battisti
,
Maruša Bradač
,
Andrew J. Bunker
,
Y. Sophia Dai
,
Clea Hannahs
,
Farhanul Hasan
,
Keunho Kim
,
Nicha Leethochawalit
,
Yu-Heng Lin
,
Michael J. Rutkowski
,
Alberto Saldana-Lopez
,
Zahra Sattari
,
Xin Wang
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/adc008
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/adc008
Ly α emission is one of a few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To accomplish this, we need an efficient way to survey for Ly α emitters (LAEs) at redshifts beyond 7, requiring unbiased emission-line observations that are both sufficiently deep and wide to cover enough volume to detect them. Here we present results from PASSAGE—a pure-parallel JWST/NIRISS slitless spectroscopic survey to detect LAEs deep into the EoR, without the bias of photometric preselection. We identify four LAEs at 7.5 ≤ z ≤ 9.5 in four surveyed pointings and estimate the luminosity function (LF). We find that the LF does show a marked decrease compared to post-reionization measurements, but the change is a factor of ≲10, which is less than expected from theoretical calculations and simulations, as well as observational expectations from the pre-JWST literature. Modeling of the intergalactic medium and expected Ly α profiles implies that these galaxies reside in ionized bubbles of ⪆2 physical Mpc. We also report that in the four fields we detect {3, 1, 0, 0} LAEs, which could indicate strong field-to-field variation in the LAE distribution, consistent with a patchy H i distribution at z ∼ 8. We compare the recovered LAE number counts with expectations from simulations and discuss the potential implications for reionization and its morphology.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3847/1538-4357/adc008
- OA Status
- gold
- Cited By
- 4
- References
- 114
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4409976283
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4409976283Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3847/1538-4357/adc008Digital Object Identifier
- Title
-
The JWST/PASSAGE Survey: Testing Reionization Histories with JWST’s First Unbiased Survey for Lyα Emitters at Redshifts 7.5–9.5Work title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
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2025Year of publication
- Publication date
-
2025-04-30Full publication date if available
- Authors
-
Axel Runnholm, Matthew Hayes, Vihang Mehta, Matthew A. Malkan, Claudia Scarlata, K. Nedkova, Marc Rafelski, Benedetta Vulcani, Mason Huberty, E. C. Herenz, Anne Hutter, S Bruton, Ayan Acharyya, Hakim Atek, Ivano Baronchelli, Andrew Battisti, Maruša Bradač, Andrew J. Bunker, Y. Sophia Dai, Clea Hannahs, Farhanul Hasan, Keunho Kim, Nicha Leethochawalit, Yu-Heng Lin, Michael J. Rutkowski, Alberto Saldana-Lopez, Zahra Sattari, Xin WangList of authors in order
- Landing page
-
https://doi.org/10.3847/1538-4357/adc008Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
goldOpen access status per OpenAlex
- OA URL
-
https://doi.org/10.3847/1538-4357/adc008Direct OA link when available
- Concepts
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Physics, Reionization, Redshift, Astrophysics, James Webb Space Telescope, Astronomy, GalaxyTop concepts (fields/topics) attached by OpenAlex
- Cited by
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4Total citation count in OpenAlex
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2025: 4Per-year citation counts (last 5 years)
- References (count)
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114Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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