A population of ultraviolet-dim protoclusters detected in absorption

Abstract

Galaxy protoclusters, which will eventually grow into the massive clusters we see in the local universe, are usually traced by locating overdensities of galaxies. Large spectroscopic surveys of distant galaxies now exist, but their sensitivity depends mainly on a galaxy's star formation activity and dust content rather than its mass. Tracers of massive protoclusters that do not rely on their galaxy constituents are therefore needed. Here we report observations of Lyman-$\alpha$ absorption in the spectra of a dense grid of background galaxies, which we use to locate a substantial number of candidate protoclusters at redshifts 2.2-2.8 via their intergalactic gas. We find that the structures producing the most absorption, most of which were previously unknown, contain surprisingly few galaxies compared to the dark matter content of their analogs in cosmological simulations. Nearly all are expected to be protoclusters, and we infer that half of their expected galaxy members are missing from our survey because they are unusually dim at rest-frame ultraviolet wavelengths. We attribute this to an unexpectedly strong and early influence of the protocluster environment on the evolution of these galaxies that reduced their star formation or increased their dust content.

arXiv commentPublished in Nature. The version of record is available at https://www.nature.com/articles/s41586-022-04681-6 or view-only at https://rdcu.be/cPIIX

References in corpus (51)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• The Atlas3D project - XX. Mass-size and mass-sigma distributions of early-type galaxies: bulge fraction drives kinematics, mass-to-light ratio, molecular gas fraction and stellar initial mass function
• Physical properties and environments of nearby galaxies
• On the evolution of the HI column density distribution in cosmological simulations
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS): The Role of Environment and Self-Regulation in Galaxy Evolution at z ~ 1
• The realm of the galaxy protoclusters
• A dominant population of optically invisible massive galaxies in the early Universe
• Discovery of a galaxy cluster with a violently starbursting core at z=2.506
• The ESO UVES Advanced Data Products Quasar Sample - II. Cosmological Evolution of the Neutral Gas Mass Density
• A massive, distant proto-cluster at z=2.47 caught in a phase of rapid formation?
• The Ubiquity of Coeval Starbursts in Massive Galaxy Cluster Progenitors
• Do submillimeter galaxies really trace the most massive dark matter halos? Discovery of a high-z cluster in a highly active phase of evolution
• The halo masses and galaxy environments of hyperluminous QSOs at z~2.7 in the Keck Baryonic Structure Survey
• The progeny of a Cosmic Titan: a massive multi-component proto-supercluster in formation at z=2.45 in VUDS
• First Data Release of the COSMOS Lyman-Alpha Mapping And Tomography Observations: 3D Lyman-$\alpha$ Forest Tomography at 2.05 < z < 2.55
• MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at $z=2.32$
• The Clustering, Number Counts and Morphology of Extremely Red (R-K>5) Galaxies to K=21
• Discovery of a rich proto-cluster at z=2.9 and associated diffuse cold gas in the VIMOS Ultra-Deep Survey (VUDS)
• Spectroscopic Confirmation of a Protocluster at $z=3.37$ with a High Fraction of Quiescent Galaxies
• Inversion of the Lyman-$\alpha$ forest: 3D investigation of the intergalactic medium
• Reproducing the Kinematics of Damped Lyman-alpha Systems
• Surveying Galaxy Proto-clusters in Emission: A Large-scale Structure at z=2.44 and the Outlook for HETDEX
• Evidence for strong evolution in galaxy environmental quenching efficiency between z = 1.6 and z = 0.9
• Discovery of a large number of candidate proto-clusters traced by ~15 Mpc-scale galaxy overdensities in COSMOS
• Shadow of a Colossus: A z=2.45 Galaxy Protocluster Detected in 3D Ly-a Forest Tomographic Mapping of the COSMOS Field
• MApping the Most Massive Overdensities Through Hydrogen (MAMMOTH) I: Methodology
• VIMOS Ultra-Deep Survey (VUDS): Witnessing the Assembly of a Massive Cluster at z~3.3
• Mean-flux Regulated PCA Continuum Fitting of SDSS Lyman-alpha Forest Spectra
• Observational Requirements for Lyman-alpha Forest Tomographic Mapping of Large-Scale Structure at z ~ 2
• A proto-cluster at z=2.45
• LATIS: The Ly$\alpha$ Tomography IMACS Survey
• Spectroscopic Confirmation of a Protocluster at z=3.786
• Large scale structure around a z=2.1 cluster
• On the Gas Content, Star Formation Efficiency, and Environmental Quenching of Massive Galaxies in Proto-Clusters at z~2.0-2.5
• Calibrating Galaxy Redshifts Using Absorption by the Surrounding Intergalactic Medium
• Protocluster Discovery in Tomographic Ly$\alpha$ Forest Flux Maps
• Galaxy evolution in protoclusters
• How Do Galaxies trace a large scale structure?: A case study around a massive protocluster at $z=3.13$
• Semi-Analytic Model Predictions of the Galaxy Population in Proto-clusters
• The Galaxy--Halo Connection in High-Redshift Universe: Details and Evolution of Stellar-to-Halo Mass Ratios of Lyman Break Galaxies on CFHTLS Deep Fields
• Revealing the z~2.5 Cosmic Web With 3D Lyman-Alpha Forest Tomography: A Deformation Tensor Approach
• The VIMOS Ultra Deep Survey. Luminosity and stellar mass dependence of galaxy clustering at z~3
• A census of optically dark massive galaxies in the early Universe from magnification by lensing galaxy clusters
• Spectroscopic Confirmation of two Extremely Massive Protoclusters BOSS1244 and BOSS1542 at $z=2.24$
• Characterizing Protoclusters and Protogroups at z $\sim$ 2.5 Using Ly$\alpha$ Tomography
• Detecting preheating in proto-clusters with Lyman-$\alpha$ Forest Tomography
• Searching for the shadows of giants II: the effect of local ionisation on the Lyman-$\alpha$ absorption signatures of protoclusters at redshift $z\sim 2.4$

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• Second Data Release of the COSMOS Lyman-alpha Mapping and Tomographic Observation: The First 3D Maps of the Detailed Cosmic Web at 2.05<z<2.55
• Observational Evidence for Large-Scale Gas Heating in a Galaxy Protocluster at z=2.30
• NOEMA formIng Cluster survEy (NICE): Characterizing eight massive galaxy groups at $1.5<z<4$ in the COSMOS field
• Discovering Large-Scale Structure at $2<z<5$ in the C3VO Survey
• The COSMOS-Web deep galaxy group catalog up to $z=3.7$
• Connecting the growth of galaxies to the large-scale environment in a massive node of the Cosmic Web at z~3
• Boosting Line Intensity Map Signal-to-Noise with the Ly-$\alpha$ Forest Cross-Correlation
• Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly$\alpha$ emitters and IGM transmission in the COSMOS field at $z\sim 5$
• LATIS: A Sample of IGM-selected Protoclusters and Protogroups at $z\sim 2.5$
• Introducing cosmosTNG: simulating galaxy formation with constrained realizations of the COSMOS field
• Prospects for studying the mass and gas in protoclusters with future CMB observations
• LATIS: Comparing Galaxy and IGM Tomography Maps as Tracers of Large-scale Structure and Protoclusters at $z\sim 2.5$
• The HST-Hyperion Survey: Companion Fraction and Overdensity in a z ~ 2.5 Proto-supercluster
• LATIS Data Release: $\sim 4200$ Spectra of $z\sim 2-3$ Galaxies, Redshifts, and Intergalactic Medium Tomography Maps