Xiaohui Fan

COSMOS-3D: Diverse Environments and Hot-dust Signatures among Dusty Star-forming Galaxies at $z$ = 4.9-7.2

Siwei Zou, Manuel Aravena, Shaoze Geng +20

Dusty star-forming galaxies (DSFGs) are expected to trace early massive-halo assembly, but the connection between dust-obscured star formation, morphology, hot dust, and environmen…

A $z \sim$ 6.2 Quasar on the Local M $_{BH}$ - $σ_{*}$ Relation Quenching Its Host Galaxy from the Aether Survey

Weizhe Liu, Emanuele Paolo Farina, Xiaohui Fan +19

We report JWST/NIRSpec integral field unit (IFU) observations of the quasar J1512 $+$ 4422 at $z \sim 6.2$ from the Aether survey. At $\sim$ 900 Myr after the Big Bang, this object al…

First-star imprints in a metal-poor galaxy overdensity near the end of reionization

Zihao Li, Koki Kakiichi, Lise Christensen +24

The first generation of stars, known as Population III (Pop III), formed from primordial gas consisting solely of hydrogen and helium and is believed to have emerged only a few hun…

A Steep-Extinction Quasi-stellar Object at z=4.6: JWST Evidence for Abundant Small Dust Grains

Mingyu Li, Zheng Cai, Roberto Maiolino +9

The rapid accumulation of massive dust reservoirs in the early Universe remains a major challenge in astrophysics. While core-collapse supernovae can inject large dust grains ($a \…

astro-ph.GA2026★ 3 cited

Shedding the envelope: JWST reveals a kiloparsec-scale [OIII]-weak Balmer shell around a z=7.64 quasar

Julien Wolf, Eduardo Bañados, Xiaohui Fan +25

Luminous quasars at the redshift frontier z>7 serve as stringent probes of super-massive black hole formation and they are thought to undergo much of their growth obscured by dense…

ALMA and JWST Identification of Faint Dusty Star-Forming Galaxies up to z~8

Jorge A. Zavala, Andreas L. Faisst, Manuel Aravena +44

We exploit a new sample of around 400 bright dusty galaxies from the ALMA CHAMPS Large Program, together with the rich JWST multi-band data products in the COSMOS field, to explore…

astro-ph.CO2025★ 7 cited

Updated dark pixel fraction constraints on reionization's end from the Lyman-series forests of XQR-30

Frederick B. Davies, Sarah E. I. Bosman, Valentina D'Odorico +16

The fraction of "dark pixels" in the Ly $α$ and other Lyman-series forests at $z \sim 5 - 6$ provides a powerful constraint on the end of the reionization process. Any spectral region…

astro-ph.GA2025★ 15 cited

JWST COSMOS-3D: Spectroscopic Census and Luminosity Function of [O III] Emitters at 6.75<z<9.05 in COSMOS

Romain A. Meyer, Feige Wang, Koki Kakiichi +38

We present a catalogue of spectroscopically selected [OIII]+Hb emitters at 6.75<z<9.05 and the resulting [OIII] 5008 ÅLuminosity Function (LF) in the COSMOS field. We leverage the…

A Metal-Free Galaxy at $z = 3.19$ ? Evidence of Late Population III Star Formation at Cosmic Noon

Sijia Cai, Mingyu Li, Zheng Cai +10

Star formation from metal-free gas, the hallmark of the first generation of Population III stars, was long assumed to occur only in the very early Universe. We report the discovery…

astro-ph.GA2025★ 4 cited

The Discovery of Little Red Dots in the Local Universe: Signatures of Cool Gas Envelopes

Xiaojing Lin, Xiaohui Fan, Zheng Cai +25

JWST observations have revealed a population of high-redshift "little red dots" (LRDs) that challenge conventional AGN models. We report the discovery of three local LRDs at $z = 0…

A 13-Billion-Year View of Galaxy Growth: Metallicity Gradient Evolution from the Local Universe to $z = 9$ with JWST and Archival Surveys

Zihao Li, Zheng Cai, Xin Wang +25

The galaxy gas-phase metallicity gradients have been extensively studied over the past four decades, both in the local and high-redshift universe, as they trace the baryon cycle an…

Enhanced Merger Fractions in a Reionization-Era Protocluster

Lorraine C. Marcelin, Jaclyn B. Champagne, Feige Wang +4

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 amo…

Lyman-Break Galaxies in the Mpc-Scale Environments Around Three $z \sim 7.5$ Quasars With JWST Imaging

Maria Pudoka, Feige Wang, Xiaohui Fan +16

We study the Mpc-scale environments of the three highest redshift luminous quasars at $z \geq 7.5$ (J031343.84-180636.40, J134208.11+092838.61, and J100758.27+211529.21) to understa…

astro-ph.GA2025★ 7 cited

Insights on Metal Enrichment and Environmental Effect at $z \approx 5 - 7$ with JWST ASPIRE/EIGER and Chemical Evolution Model

Zihao Li, Koki Kakiichi, Lise Christensen +15

We present the mass-metallicity relation (MZR) for a parent sample of 604 galaxies at $z = 5.34 - 6.94$ with \OIII\ doublets detected, using the deep JWST/NIRCam wide field slitless sp…

astro-ph.GA2024★ 4 cited

A unique window into the Epoch of Reionisation: A double-peaked Lyman- $α$ emitter in the proximity zone of a quasar at $z \sim 6.6$

Klaudia Protušová, Sarah E. I. Bosman, Feige Wang +12

We present a study of a double-peaked Ly $α$ emitter, named LAE-11, found in the proximity zone of QSO J0910-0414 at $z \sim 6.6$ . We use a combination of deep photometric data from S…

A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Spectroscopically Complete Census of Obscured Cosmic Star Formation Rate Density at $z = 4 - 6$

Fengwu Sun, Feige Wang, Jinyi Yang +25

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 obtaine…

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

Jiang-Tao Li, Xiaodi Yu, Huiyang Mao +22

The He II reionization epoch is expected to take place at $z \sim 3 - 5$ . In this stage, the helium and metals in the inter-galactic medium (IGM) are further ionized with additional co…

Constraining the excitation of molecular gas in Two Quasar-Starburst Systems at $z \sim 6$

Fuxiang Xu, Ran Wang, Jianan Li +15

We present NOrthern Extended Millimeter Array observations of CO(8-7), (9-8), and (10-9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J205…

astro-ph.CO2024★ 1 cited

A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Supports Earlier Reionization around [OIII] Emitters

Xiangyu Jin, Jinyi Yang, Xiaohui Fan +22

Understanding when and how reionization happened is crucial for studying the early structure formation and the properties of first galaxies in the Universe. At $z > 5.5$ , the observe…

A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: II. An Environmental Analysis of Galaxy Properties in an Overdense Structure

Jaclyn B. Champagne, Feige Wang, Jinyi Yang +21

We present paper II comprising a 35 arcmin $^{2}$ \textit{JWST}/NIRCam imaging and wide-field slitless spectroscopy mosaic centered on J0305 $-$ 3150, a luminous quasar at $z = 6.61$ . The…

astro-ph.GA2024★ 13 cited

A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: I. Properties of [OIII] Emitters in a 10 Mpc Overdensity Structure

Jaclyn B. Champagne, Feige Wang, Haowen Zhang +25

ASPIRE (A SPectroscopic survey of bIased halos in the Reionization Era) is a quasar legacy survey primarily using \textit{JWST} to target a sample of 25 $z > 6$ quasars with NIRCam s…

Large Scale Overdensity of Lyman Break Galaxies Around the z=6.3 Ultraluminous Quasar J0100+2802

Maria Pudoka, Feige Wang, Xiaohui Fan +8

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 hi…

Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg $^{2}$ Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI

Yongming Liang, Masami Ouchi, Dongsheng Sun +27

We report the identification of a quasar overdensity in the BOSSJ0210 field, dubbed Cosmic Himalayas, consisting of 11 quasars at $z = 2.16 - 2.20$ , the densest overdensity of quasars…