Publications
First Author Works
Selected first-author talks, proposals, and papers with full publication details.
Lyman-break Galaxies in the Megaparsec-scale Environments around Three z ∼ 7.5 Quasars with JWST Imaging
Pudoka, M., Wang, F., Fan, X., Yang, J., Champagne, J. et al.
The Astrophysical Journal • 2025-07
We study the megaparsec-scale environments of the three highest-redshift luminous quasars at z ≥ 7.5 (J031343.84-180636.40, J134208.11+092838.61, and J100758.27+211529.21) to understand their connection to large-scale structure. Cosmological simulati...
Large-scale Overdensity of Lyman Break Galaxies around the z = 6.3 Ultraluminous Quasar J0100 + 2802
Pudoka, M., Wang, F., Fan, X., Yang, J., Champagne, J. et al.
The Astrophysical Journal • 2024-06
We study the environment of the z = 6.33 ultraluminous quasar SDSS J010013.02+280225.8 (J0100) to understand its association with large-scale structure. Theoretical models propose high-redshift quasars as markers of galaxy overdensities residing in t...
Mapping Cosmic Structure Evolution: Characterizing Two Massive Galaxy Protoclusters Anchored by z>7.5 Luminous Quasars
Pudoka, M., Wang, F., Banados, E., Cai, Z., Champagne, J. et al.
JWST Proposal. Cycle 3 • 2024-02
Structure formation models predict that the earliest billion-M_sun supermassive black holes must form in the most massive dark matter halos and can therefore be anchors of protoclusters in the Epoch of Reionization. We propose to study the environmen...
Large Scale Overdensity of Lyman Break Galaxies Around the z=6.3 Ultraluminous Quasar J0100+2802
Pudoka, M., Wang, F., Fan, X., Yang, J., Champagne, J. et al.
American Astronomical Society Meeting Abstracts #243 • 2024-02
We study the environment of the z = 6.33 ultraluminous quasar SDSS J010013.02+280225.8 (J0100) to understand its association with large-scale structure. Theoretical models propose high-redshift quasars as markers of galaxy overdensities residing in t...
Evaluating Stellar Ages from Single-Epoch High-Resolution Spectroscopy
Pudoka, M., Terndrup, D., An, D. et al.
American Astronomical Society Meeting Abstracts #237 • 2021-01
We present new measurements of projected rotation rates (v sin i) derived from high-resolution spectra of unevolved G and K field dwarfs (Kim et al. 2010) and previously unpublished spectra of low mass dwarfs in the Alpha Persei open cluster. These s...
Other Publications
Extreme galaxy-scale outflows are frequent among luminous early quasars
Liu, W., Fan, X., Li, H., Green, R., Yang, J. et al.
Nature • 2026-05
The existence of abundant post-starburst and quiescent galaxies just about 1─2 Gyr after the Big Bang challenges our current model of galaxy evolution1, 2─3. Cosmological simulations suggest that quasar feedback is likely the most promisin...
Shedding the envelope: JWST reveals a kiloparsec-scale [O III]-weak Balmer shell around a z = 7.64 quasar
Wolf, J., Bañados, E., Fan, X., Dumont, A., Davies, J. et al.
Astronomy and Astrophysics • 2026-03
Luminous quasars at the redshift frontier z > 7 serve as stringent probes of super-massive black hole (SMBH) formation and they are thought to undergo much of their growth obscured by dense gas and dust in their host galaxies. Fully characterizing...
Clustering of z~6.6 Quasars and [O III] Emitters Constrains Host Halo Masses and Duty Cycles in 25 ASPIRE Fields
Huang, J., Hennawi, J., Pizzati, E., Wang, F., Yang, J. et al.
arXiv e-prints • 2026-02
We use data from the JWST ASPIRE Wide Field Slitless Spectroscopy (WFSS) program to measure the auto-correlation function of [O,{\sc iii}] emitters at 5.3$<z<$7.0 and the quasar--[O,{\sc iii}] emitter cross-correlation around 25 ASPIRE quasars ...
ASPIRE: The Environments and Dark Matter Halos of Luminous Quasars in the Epoch of Reionization
Wang, F., Champagne, J., Huang, J., Yang, J., Hennawi, J. et al.
arXiv e-prints • 2026-02
We present a systematic study of the environments of 25 luminous quasars at $z > 6.5$ from the ASPIRE program. Using JWST/NIRCam WFSS data, we identified 487 galaxies at $5.3 \lesssim z \lesssim 7.0$ exhibiting [OIII] emission. Among these, 122 [O...
The Luminosity Function and Clustering of Hα Emitting Galaxies at z ≍ 4−6 from a Complete NIRCam Grism Redshift Survey
Lin, X., Egami, E., Sun, F., Zhang, H., Fan, X. et al.
The Astrophysical Journal • 2026-02
We study the luminosity function (LF) and clustering properties of 888 Hα emitters (HAEs) at 3.75 < z < 6 in the GOODS-N field. The sample, built from JWST CONGRESS and FRESCO NIRCam grism surveys using a novel redshift assignment algorithm, sp...
The Discovery of Little Red Dots in the Local Universe: Signatures of Cool Gas Envelopes
Lin, X., Fan, X., Cai, Z., Bian, F., Liu, H. et al.
The Astrophysical Journal • 2026-02
JWST observations have revealed a population of high-redshift "little red dots" (LRDs) that challenge conventional active galactic nucleus (AGN) models. We report the discovery of three local LRDs at z = 0.1─0.2, initially selected from the Sloan Dig...
A Deep Chandra X-Ray Survey of a Luminous Quasar Sample at z ∼ 7
Jin, X., Wang, F., Yang, J., Fan, X., Bian, F. et al.
The Astrophysical Journal • 2026-01
We present new Chandra observations of seven luminous quasars at z > 6.5. Combined with archival Chandra observations of all other known quasars, they form nearly complete X-ray observations of all currently known z ∼ 7 quasars with M1450
The Large-scale Environments of Low-luminosity AGNs at 3.9 < z < 6 and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey
Lin, X., Fan, X., Sun, F., Zhang, J., Egami, E. et al.
The Astrophysical Journal • 2026-01
We study the large-scale environments and clustering properties of 28 low-luminosity active galactic nuclei (AGNs) at z = 3.9─6 in the GOODS-N field. Our sample, identified from the JWST NIRCam Imaging and WFSS data in Complete NIRCam Grism Redshift ...
Quasar Radiative Feedback May Suppress Galaxy Growth on Intergalactic Scales at z = 6.3
Zhu, Y., Egami, E., Fan, X., Sun, F., Becker, G. et al.
The Astrophysical Journal • 2025-12
We present observational evidence that intense ionizing radiation from a luminous quasar suppresses nebular emission in nearby galaxies on intergalactic scales at z = 6.3. Using JWST/NIRCam grism spectroscopy from the Slitless Areal Pure-Parallel Hig...
A JWST/NIRSpec Integral Field Unit Survey of Luminous Quasars at z ~ 5-6 (Q-IFU): Rest-frame Optical Nuclear Properties and Extended Nebulae
Liu, W., Fan, X., Li, H., Green, R., Champagne, J. et al.
arXiv e-prints • 2025-11
It remains debatable how billion-solar-mass supermassive black holes (SMBHs) form and evolve within the first billion years. We report results from a James Webb Space Telescope (JWST)/NIRSpec integral field unit (IFU) survey of 27 luminous quasars at...
Insights on metal enrichment and environmental effects at z ≈ 5─7 with JWST ASPIRE/EIGER and the chemical evolution model
Li, Z., Kakiichi, K., Christensen, L., Cai, Z., Dekel, A. et al.
Astronomy and Astrophysics • 2025-11
We present the mass─metallicity relation (MZR) for a parent sample of 604 galaxies at z = 5.34 − 6.94 with [O III] doublets detected that was obtained from the deep JWST/NIRCam wide field slitless spectroscopic (WFSS) observations in 26 quasar fields...
JWST COSMOS-3D: Spectroscopic Census and Luminosity Function of [O III] Emitters at 6.75<z<9.05 in COSMOS
Meyer, R., Wang, F., Kakiichi, K., Brammer, G., Champagne, J. et al.
arXiv e-prints • 2025-10
We present a spectroscopically-selected [OIII]+Hb emitters catalogue at 6.75<z<9.05 and the resulting [OIII] 5008 ÅLuminosity Function (LF) in the COSMOS field. We leverage the 0.3 deg$^{2}$ covered to date by COSMOS-3D using NIRCam/WFSS F444W ...
Enhanced Merger Fractions in a Reionization-era Protocluster
Marcelin, L., Champagne, J., Wang, F., Fan, X., Pudoka, M. et al.
Research Notes of the American Astronomical Society • 2025-06
Mergers play a critical role in galaxy evolution, but their relationship to their surrounding environments is unexplored at high redshift. We investigate the galaxy merger rate among 124 [O III] emitters at 5.3 < z < 6.9 as a function of local ...
A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. II. An Environmental Analysis of Galaxy Properties in an Overdense Structure
Champagne, J., Wang, F., Yang, J., Fan, X., Hennawi, J. et al.
The Astrophysical Journal • 2025-03
We present in this paper (Paper II of the series) a 35 arcmin2 JWST/NIRCam imaging and wide-field slitless spectroscopy mosaic centered on J0305─3150, a luminous quasar at z = 6.61. The F356W grism data reveal 124 [O III]+Hβ emitters at 5....
A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O III] Emitters in a 10 Mpc Overdensity Structure
Champagne, J., Wang, F., Zhang, H., Yang, J., Fan, X. et al.
The Astrophysical Journal • 2025-03
A SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy survey primarily using JWST to target a sample of 25 z > 6 quasars with NIRCam slitless spectroscopy and imaging. The first study in this series found evidence of a ...
DIVER: Deep Insights into UV Spectroscopy at the Epoch of Reionization
Lin, X., Bunker, A., Cai, Z., Carniani, S., Charlot, S. et al.
JWST Proposal. Cycle 4 • 2025-03
JWST has ushered in a new era for spectroscopic studies of galaxies at the Epoch of Reionization (EoR). Early observations have revealed hard radiation fields and bursty star formation, sometimes accompanied by extreme interstellar medium (ISM) condi...
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): Spectroscopically Complete Census of Obscured Cosmic Star Formation Rate Density at z = 4─6
Sun, F., Wang, F., Yang, J., Champagne, J., Decarli, R. et al.
The Astrophysical Journal • 2025-02
We present a stringent measurement of the dust-obscured star formation rate density (SFRD) at z = 4─6 from the ASPIRE JWST Cycle-1 medium and ALMA Cycle-9 large program. We obtained JWST/NIRCam grism spectroscopy and ALMA 1.2 mm continuum map along 2...
A SPectroscopic Survey of Biased Halos In the Reionization Era (ASPIRE): JWST Supports Earlier Reionization around [O III] Emitters
Jin, X., Yang, J., Fan, X., Wang, F., Kakiichi, K. et al.
The Astrophysical Journal • 2024-11
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 ...
Fast Outflow in the Host Galaxy of the Luminous z = 7.5 Quasar J1007+2115
Liu, W., Fan, X., Yang, J., Bañados, E., Wang, F. et al.
The Astrophysical Journal • 2024-11
The James Webb Space Telescope opens a new window to directly probe luminous quasars powered by billion solar mass black holes in the Epoch of Reionization and their coevolution with massive galaxies with unprecedented details. In this paper, we repo...
A SPectroscopic Survey of Biased Halos In the Reionization Era (ASPIRE): Broad-line AGN at z = 4−5 Revealed by JWST/NIRCam WFSS
Lin, X., Wang, F., Fan, X., Cai, Z., Champagne, J. et al.
The Astrophysical Journal • 2024-10
Low-luminosity active galactic nuclei (AGNs) with low-mass black holes (BHs) in the early universe are fundamental to understanding the BH growth and their coevolution with the host galaxies. Utilizing JWST NIRCam Wide Field Slitless Spectroscopy, we...
A quasar-galaxy merger at z ∼ 6.2: Rapid host growth via the accretion of two massive satellite galaxies
Decarli, R., Loiacono, F., Farina, E., Dotti, M., Lupi, A. et al.
Astronomy and Astrophysics • 2024-09
We present JWST/NIRSpec integral field spectroscopy in the rest-frame optical bands of the system PJ308─21, a quasar at z = 6.2342 caught as its host galaxy interacts with companion galaxies. We detect the spatially extended emission of several emiss...
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Discovers an Overdensity around a Metal Absorption-selected Galaxy at z 5.5
Wu, Y., Wang, F., Cai, Z., Fan, X., Finlator, K. et al.
The Astrophysical Journal • 2023-10
The launch of JWST opens a new window for studying the connection between metal-line absorbers and galaxies at the end of the Epoch of Reionization. Previous studies have detected absorber-galaxy pairs in limited quantities through ground-based obser...
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z = 6.61 Quasar
Wang, F., Yang, J., Hennawi, J., Fan, X., Sun, F. et al.
The Astrophysical Journal • 2023-07
We present the first results from the JWST program A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE). This program represents an imaging and spectroscopic survey of 25 reionization-era quasars and their environments by utilizing...