Starbursts with suppressed velocity dispersion revealed in a forming cluster at z=2.51

Abstract

One of the most prominent features of galaxy clusters is the presence of a dominant population of massive ellipticals in their cores. Stellar archaeology suggests that these gigantic beasts assembled most of their stars in the early Universe via starbursts. However, the role of dense environments and their detailed physical mechanisms in triggering starburst activities remain unknown. Here we report spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) observations of the CO $J=3-2$ emission line, with a resolution of about 2.5 kiloparsecs, toward a forming galaxy cluster core with starburst galaxies at $z=2.51$. In contrast to starburst galaxies in the field often associated with galaxy mergers or highly turbulent gaseous disks, our observations show that the two starbursts in the cluster exhibit dynamically cold (rotation-dominated) gas-rich disks. Their gas disks have extremely low velocity dispersion (${\sigma }_0\sim 20-30$ km s${}^{-1}$), which is three times lower than their field counterparts at similar redshifts. The high gas fraction and suppressed velocity dispersion yield gravitationally unstable gas disks, which enables highly efficient star formation. The suppressed velocity dispersion, likely induced by the accretion of corotating and coplanar cold gas, might serve as an essential avenue to trigger starbursts in massive halos at high redshifts.

arXiv comment19 pages, 14 figures, 3 tables. Accepted for publication in A&A

References in corpus (107)

• Galactic Stellar and Substellar Initial Mass Function
• On the variation of the Initial Mass Function
• Cosmic Star Formation History
• Star Formation in the Milky Way and Nearby Galaxies
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• [O III]/[N II] as an Abundance Indicator at High Redshift
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
• CIGALE: a python Code Investigating GALaxy Emission
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• Analysis of galaxy SEDs from far-UV to far-IR with CIGALE: Studying a SINGS test sample
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• First Results from the TNG50 Simulation: The evolution of stellar and gaseous disks across cosmic time
• The Molecular Interstellar Medium in Ultraluminous Infrared Galaxies
• Molecular Gas at High Redshift
• Formation of Galaxy Clusters
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• Radiation Pressure Supported Starburst Disks and AGN Fueling
• Submillimeter Galaxies at z~2: Evidence for Major Mergers & Constraints on Lifetimes, IMF and CO-H2 Conversion Factor
• Gas-to-Dust mass ratios in local galaxies over a 2 dex metallicity range
• HERACLES: The HERA CO-Line Extragalactic Survey
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• The CO-to-H2 Conversion Factor From Infrared Dust Emission Across the Local Group
• Revisiting the Infrared Spectra of Active Galactic Nuclei with a New Torus Emission Model
• The Evolving Interstellar Medium of Star Forming Galaxies Since z=2 as Probed by Their Infrared Spectral Energy Distributions
• How Do Disks Survive Mergers?
• Star Formation and Dust Attenuation Properties in Galaxies from a Statistical UV-to-FIR Analysis
• A Merger-Driven Scenario for Cosmological Disk Galaxy Formation
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• A survey of molecular gas in luminous sub-millimetre galaxies
• Andromeda's Dust
• A Public Ks-selected Catalog in the COSMOS/UltraVISTA Field: Photometry, Photometric Redshifts and Stellar Population Parameters
• The Kiloparsec-Scale Kinematics of High-Redshift Star-Forming Galaxies
• Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
• A Unified Model for Galactic Discs: Star Formation, Turbulence Driving, and Mass Transport
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• Evolution of the dust emission of massive galaxies up to z=4 and constraints on their dominant mode of star formation
• The SINS survey: modeling the dynamics of z~2 galaxies and the high-z Tully-Fisher relation
• Clustering of Submillimeter-Selected Galaxies
• CO excitation of normal star forming galaxies out to z=1.5 as regulated by the properties of their interstellar medium
• Hydrodynamics of high-redshift galaxy collisions: From gas-rich disks to dispersion-dominated mergers and compact spheroids
• The ISM in distant star-forming galaxies: Turbulent pressure, fragmentation and cloud scaling relations in a dense gas disk at z=2.3
• Discovery of a galaxy cluster with a violently starbursting core at z=2.506
• Star-Forming Galaxies at Cosmic Noon
• A massive core for a cluster of galaxies at a redshift of 4.3
• Evidence for a clumpy, rotating gas disk in a submillimeter galaxy at z=4
• An extreme proto-cluster of luminous dusty starbursts in the early Universe
• Evidence for strong dynamical evolution in disk galaxies through the last 11 Gyr. GHASP VIII: A local reference sample of rotating disk galaxies for high redshift studies
• A dynamically cold disk galaxy in the early Universe
• Is Turbulence in the Interstellar Medium Driven by Feedback or Gravity? An Observational Test
• The Evolution and Origin of Ionized Gas Velocity Dispersion from $z\sim 2.6$ to $z\sim 0.6$ with KMOS${}^{3D}$
• MASSIV: Mass Assembly Survey with SINFONI in VVDS - II. Kinematics and close environment classification
• Starbursts in and out of the star-formation main sequence
• A massive, distant proto-cluster at z=2.47 caught in a phase of rapid formation?
• Dynamical properties of AMAZE and LSD galaxies from gas kinematics and the Tully-Fisher relation at z~3
• An excess of dusty starbursts related to the Spiderweb galaxy
• GOODS-Herschel~: Gas-to-dust mass ratios and CO-to-H_2 conversion factors in normal and starbursting galaxies at high-z
• Dynamical properties of z $\sim 4.5$ dusty star-forming galaxies and their connection with local early type galaxies
• The KMOS^3D Survey: data release and final survey paper
• Co-planar streams, pancakes, and angular-momentum exchange in high-z disc galaxies
• DYNAMO I: A Sample of Ha-Luminous Galaxies with Resolved Kinematics
• GalPak3D: A Bayesian parametric tool for extracting morpho-kinematics of galaxies from 3D data
• Automated Mining of the ALMA Archive in the COSMOS Field (A3COSMOS): II. Cold Molecular Gas Evolution out to Redshift 6
• The Ubiquity of Coeval Starbursts in Massive Galaxy Cluster Progenitors
• Resolving the ISM at the peak of cosmic star formation with ALMA - The distribution of CO and dust continuum in z~2.5 sub-millimetre galaxies
• High-redshift major mergers weakly enhance star formation
• A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang
• The progeny of a Cosmic Titan: a massive multi-component proto-supercluster in formation at z=2.45 in VUDS
• The ALMA Spectroscopic Survey in the HUDF: CO Excitation and Atomic Carbon in Star-Forming Galaxies at $z=1-3$
• The KMOS Deep Survey (KDS) I: dynamical measurements of typical star-forming galaxies at z $\simeq$ 3.5
• Cold Molecular Gas in Merger Remnants: I. Formation of Molecular Gas Disks
• The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies
• Flat rotation curves and low velocity dispersions in KMOS star-forming galaxies at z~1
• Fast rotating and low-turbulence discs at $z\simeq 4.5$: Dynamical evidence of their evolution into local early-type galaxies
• GOODS-ALMA 2.0: Source catalog, number counts, and prevailing compact sizes in 1.1 mm galaxies
• Angular momentum evolution of galaxies over the past 10-Gyr: A MUSE and KMOS dynamical survey of 400 star-forming galaxies from z=0.3-1.7
• The implications of the surprising existence of a large, massive CO disk in a distant protocluster
• Rotating starburst cores in massive galaxies at z=2.5
• CO(1-0) line imaging of massive star-forming disc galaxies at z=1.5-2.2
• A Total Molecular Gas Mass Census in z~2-3 Star-forming Galaxies: Low-J CO Excitation Probes of Galaxies' Evolutionary States
• VLA-ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (VLASPECS): Total Cold Gas Masses and CO Line Ratios for z=2-3 "Main Sequence" Galaxies
• The Main Sequence at $z\sim 1.3$ contains a sizable fraction of galaxies with compact star formation sizes: a new population of early post-starbursts?
• High-resolution spectroscopic imaging of CO in a z=4.05 proto-cluster
• A mass threshold for galactic gas discs by spin flips
• Total Molecular Gas Masses of z~3 Lyman-Break Galaxies: CO(1-0) Emission in MS1512-cB58 and the Cosmic Eye
• Confirming Herschel candidate protoclusters from ALMA/VLA CO observations
• Revealing environmental dependence of molecular gas content in a distant X-ray cluster at z=2.51
• CO emission in distant galaxies on and above the main sequence
• Kinematic Downsizing at z~2
• Velocity dispersion in the interstellar medium of early galaxies
• ALMA Lensing Cluster Survey: Bright [CII] 158 $\mu$m Lines from a Multiply Imaged Sub-$L^{\star }$ Galaxy at $z=6.0719$
• Spatially resolved kinematics in the central 1 kpc of a compact star-forming galaxy at z=2.3 from ALMA CO observations
• VLA Mapping of the CO(1-0) Line in SMM J14011+0252
• Total Molecular Gas Masses of Planck - Herschel Selected Strongly Lensed Hyper Luminous Infrared Galaxies
• Comprehensive Gas Characterization of a $z=2.5$ Protocluster: A Cluster Core Caught in the Beginning of Virialization?
• GOODS-ALMA 2.0: Starbursts in the main sequence reveal compact star formation regulating galaxy evolution prequenching
• Sub-millimetre compactness as a critical dimension to understand the Main Sequence of star-forming galaxies
• Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5
• CNO emission of an unlensed submillimeter galaxy at z=4.3
• Rapid Filamentary Accretion as the Origin of Extended Thin Discs
• Radio selection of the most distant galaxy clusters
• The PUMA project. III. Incidence and properties of ionised gas disks in ULIRGs, associated velocity dispersion and its dependence on starburstiness
• Evaluating Galaxy Dynamical Masses From Kinematics and Jeans Equilibrium in Simulations
• Discovery of a protocluster core associated with an enormous Ly$\alpha$ Nebula at $z=2.3$

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• The ALMA-ALPAKA survey I: high-resolution CO and [CI] kinematics of star-forming galaxies at z = 0.5-3.5
• Cold gas disks in main-sequence galaxies at cosmic noon: Low turbulence, flat rotation curves, and disk-halo degeneracy
• VLA Legacy Survey of Molecular Gas in Massive Star-forming Galaxies at High Redshift
• JWST's first glimpse of a z > 2 forming cluster reveals a top-heavy stellar mass function
• Accelerated structural evolution of galaxies in a starbursting cluster at z=2.51
• Unveiling dust, molecular gas, and high star formation efficiency in extremely UV bright star-forming galaxies at $z\sim 2.1-3.6$
• Observational biases on rotation curves from IFU data at cosmic noon
• Ram-pressure stripping caught in action in a young cluster at $z=2.51$