Observational Evidence for Large-Scale Gas Heating in a Galaxy Protocluster at z=2.30

Abstract

We report a $z=2.30$ galaxy protocluster (COSTCO-I) in the COSMOS field, where the Lyman-$\alpha$ forest as seen in the CLAMATO IGM tomography survey does not show significant absorption. This departs from the transmission-density relationship (often dubbed the fluctuating Gunn-Peterson approximation; FGPA) usually expected to hold at this epoch, which would lead one to predict strong Ly$\alpha$ absorption at the overdensity. For comparison, we generate mock Lyman-$\alpha$ forest maps by applying FGPA to constrained simulations of the COSMOS density field, and create mocks that incorporate the effects of finite sightline sampling, pixel noise, and Wiener filtering. Averaged over $r=15h^{-1}\mathrm{Mpc}$ around the protocluster, the observed Lyman-$\alpha$ forest is consistently more transparent in the real data than in the mocks, indicating a rejection of the null hypothesis that the gas in COSTCO-I follows FGPA ($p=0.0026$, or $2.79\sigma$ significance). It suggests that the large-scale gas associated with COSTCO-I is being heated above the expectations of FGPA, which might be due to either large-scale AGN jet feedback or early gravitational shock heating. COSTCO-I is the first known large-scale region of the IGM that is observed to be transitioning from the optically-thin photoionized regime at Cosmic Noon, to eventually coalesce into an intra-cluster medium (ICM) by $z=0$. Future observations of similar structures will shed light on the growth of the ICM and allow constraints on AGN feedback mechanisms.

arXiv comment12 pages, 5 figures (including one interactive figure at https://member.ipmu.jp/chenze.dong/materials/COSTCO-I/). Accepted by ApJL

References in corpus (56)

• Simulating Galaxy Formation with the IllustrisTNG Model
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• Equation of State of the Photoionized Intergalactic Medium
• The Baryon Census in a Multiphase Intergalactic Medium: 30% of the Baryons May Still Be Missing
• The MOSFIRE Deep Evolution Field (MOSDEF) Survey: Rest-Frame Optical Spectroscopy for ~1500 H-Selected Galaxies at 1.37 < z < 3.8
• Where Are the Baryons? II: Feedback Effects
• Optical Mass Estimates of Galaxy Clusters
• Ancient Light from Young Cosmic Cities: Physical and Observational Signatures of Galaxy Proto-Clusters
• The VIMOS Ultra-Deep Survey: ~10,000 galaxies with spectroscopic redshifts to study galaxy assembly at early epochs 2<z<~6
• The realm of the galaxy protoclusters
• The case for AGN feedback in galaxy groups
• Discovery of a galaxy cluster with a violently starbursting core at z=2.506
• Galaxy Protoclusters as Drivers of Cosmic Star-Formation History in the First 2 Gyr
• The Thermal Memory of Reionization History
• Simulations of AGN feedback in galaxy clusters and groups: impact on gas fractions and the Lx-T scaling relation
• A Refined Measurement of the Mean Transmitted Flux in the Ly-alpha Forest over 2 < z < 5 Using Composite Quasar Spectra
• Probing the missing baryons with the Sunyaev-Zel'dovich effect from filaments
• Imprint of Inhomogeneous Hydrogen Reionization on the Temperature Distribution of the Intergalactic Medium
• 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
• Lyman-alpha Forest Tomography from Background Galaxies: The First Megaparsec-Resolution Large-Scale Structure Map at z>2
• IGM Constraints from the SDSS-III/BOSS DR9 Ly-alpha Forest Flux Probability Distribution Function
• Shadow of a Colossus: A z=2.45 Galaxy Protocluster Detected in 3D Ly-a Forest Tomographic Mapping of the COSMOS Field
• ZFIRE: A KECK/MOSFIRE Spectroscopic Survey of Galaxies in Rich Environments at z~2
• MApping the Most Massive Overdensities Through Hydrogen (MAMMOTH) I: Methodology
• A New Measurement of the Temperature Density Relation of the IGM From Voigt Profile Fitting
• LATIS: The Ly$\alpha$ Tomography IMACS Survey
• Protocluster Discovery in Tomographic Ly$\alpha$ Forest Flux Maps
• COSMIC BIRTH: Efficient Bayesian Inference of the Evolving Cosmic Web from Galaxy Surveys
• The discovery of a radio galaxy of at least 5 Mpc
• A new Measurement of the Intergalactic Temperature at $z\sim 2.55-2.95$
• MIGHTEE: Are giant radio galaxies more common than we thought?
• Comprehensive Gas Characterization of a $z=2.5$ Protocluster: A Cluster Core Caught in the Beginning of Virialization?
• The impact of AGN feedback on the 1D power spectra from the Ly$\alpha$ forest using the Horizon-AGN suite of simulations
• Spectroscopic Confirmation of a Coma Cluster Progenitor at z ~ 2.2
• LyMAS: Predicting Large-Scale Lyman-alpha Forest Statistics from the Dark Matter Density Field
• 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
• Modeling the Lyman-alpha Forest in Collisionless Simulations
• A tomographic map of the large-scale matter distribution using the eBOSS Stripe 82 Ly-$\alpha$ forest
• Predicted future fate of COSMOS galaxy protoclusters over 11 Gyr with constrained simulations
• Voids in Lyα Forest Tomographic Maps
• BIRTH of the COSMOS Field: Primordial and Evolved Density Reconstructions During Cosmic High Noon
• Systematic Continuum Errors in the Lyman-Alpha Forest and The Measured Temperature-Density Relation
• Mapping quasar light echoes in 3D with Lyα forest tomography
• A population of ultraviolet-dim protoclusters detected in absorption
• Characterizing Protoclusters and Protogroups at z $\sim$ 2.5 Using Ly$\alpha$ Tomography
• TARDIS Paper II: Synergistic Density Reconstruction from Lyman-alpha Forest and Spectroscopic Galaxy Surveys with Applications to Protoclusters and the Cosmic Web
• On the Search for Quasar Light Echoes
• The evolution of a pre-heated Intergalactic Medium
• Measuring alignments between galaxies and the cosmic web at $z\sim 2-3$ using IGM tomography
• Constraining the Fluctuating Gunn-Peterson Approximation Using Lyman-$\alpha$ Forest Tomography at $z=2$
• 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 $z\sim 2.4$
• The Dependence of Galaxy Properties on the Underlying 3D Matter Density Field at 2.0 < z < 2.5

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