Submillimetre galaxies in two massive protoclusters at z = 2.24: witnessing the enrichment of extreme starbursts in the outskirts of HAE density peaks

Abstract

Submillimetre galaxies represent a rapid growth phase of both star formation and massive galaxies. Mapping SMGs in galaxy protoclusters provides key insights into where and how these extreme starbursts take place in connections with the assembly of the large-scale structure in the early Universe. We search for SMGs at 850$\mu m$ using JCMT/SCUBA-2 in two massive protoclusters at $z=2.24$, BOSS1244 and BOSS1542, and detect 43 and 54 sources with $S_{850}>4$mJy at the $4\sigma$ level within an effective area of 264arcmin${}^2$, respectively. We construct the intrinsic number counts and find that the abundance of SMGs is $2.0\pm 0.3$ and $2.1\pm 0.2$ times that of the general fields, confirming that BOSS1244 and BOSS1542 contain a higher fraction of dusty galaxies with strongly enhanced star formation. The volume densities of the SMGs are estimated to be $\sim 15-$30 times the average, significantly higher than the overdensity factor ($\sim 6$) traced by H$\alpha$ emission-line galaxies (HAEs). More importantly, we discover a prominent offset between the spatial distributions of the two populations in these two protoclusters -- SMGs are mostly located around the high-density regions of HAEs, and few are seen inside these regions. This finding may have revealed for the first time the occurrence of violent star formation enhancement in the outskirts of the HAE density peaks, likely driven by the boosting of gas supplies and/or starburst triggering events. Meanwhile, the lack of SMGs inside the most overdense regions at $z\sim 2$ implies a transition to the environment disfavouring extreme starbursts.

arXiv comment16pages, 11figures, accepted for publication in MNRAS

References in corpus (106)

• On the variation of the Initial Mass Function
• Cosmic Star Formation History
• On the normalisation of the cosmic star formation history
• The hierarchical formation of the brightest cluster galaxies
• Physical Models of Galaxy Formation in a Cosmological Framework
• Unveiling Dust-enshrouded Star Formation in the Early Universe: a Sub-mm Survey of the Hubble Deep Field
• A Deep Sub-millimeter Survey of Lensing Clusters: A New Window on Galaxy Formation and Evolution
• A Redshift Survey of the Submillimeter Galaxy Population
• Submillimeter Galaxies at z~2: Evidence for Major Mergers & Constraints on Lifetimes, IMF and CO-H2 Conversion Factor
• Dusty star forming galaxies at high redshift
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• 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
• The nature of faint submm-selected galaxies
• Ancient Light from Young Cosmic Cities: Physical and Observational Signatures of Galaxy Proto-Clusters
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: The Redshift Distribution and Evolution of Submillimeter Galaxies
• An ALMA survey of submillimeter galaxies in the Extended Chandra Deep Field South: Source catalog and multiplicity
• The realm of the galaxy protoclusters
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• Sub-millimeter galaxies as progenitors of compact quiescent galaxies
• Clustering of Submillimeter-Selected Galaxies
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts
• An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the rest-frame far-infrared emission of sub-millimeter galaxies
• The LABOCA survey of the Extended Chandra Deep Field South: A photometric redshift survey of submillimetre galaxies
• The Hydrangea simulations: galaxy formation in and around massive clusters
• High-redshift star formation in the ALMA era
• Compact starbursts in z~3-6 submillimeter galaxies revealed by ALMA
• What are Protoclusters? -- Defining High Redshift Galaxy Clusters and Protoclusters
• The Formation of Submillimetre-Bright Galaxies from Gas Infall over a Billion Years
• The LABOCA Survey of the Extended Chandra Deep Field South: Clustering of submillimetre galaxies
• The impact of clustering and angular resolution on far-infrared and millimeter continuum observations
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• The stellar masses and specific star-formation rates of submillimetre galaxies
• GOODS-Herschel and CANDELS: The Morphologies of Ultraluminous Infrared Galaxies at z~2
• An excess of dusty starbursts related to the Spiderweb galaxy
• The rapid assembly of an elliptical galaxy of 400 billion solar masses at a redshift of 2.3
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: Spectroscopic redshifts
• Millimeter imaging of submillimeter galaxies in the COSMOS field: Redshift distribution
• ALMA Deep Field in SSA22: A concentration of dusty starbursts in a z=3.09 protocluster core
• Do submillimeter galaxies really trace the most massive dark matter halos? Discovery of a high-z cluster in a highly active phase of evolution
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular gas reservoirs in high-redshift galaxies
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: The AGN Fraction and X-ray Properties of Submillimeter Galaxies
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation
• Evolution of the Cool Gas in the Circumgalactic Medium (CGM) of Massive Halos -- A Keck Cosmic Web Imager (KCWI) Survey of Ly$\alpha$ Emission around QSOs at $z\approx 2$
• MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at $z=2.32$
• A Hubble Space Telescope NICMOS and ACS Morphological Study of z~2 Submillimetre Galaxies
• Spatial correlation between submillimetre and Lyman-alpha galaxies in the SSA 22 protocluster
• The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees
• The SCUBA-2 Cosmology Legacy Survey: the nature of bright submm galaxies from 2 deg2 of 850-um imaging
• A spatially resolved study of cold dust, molecular gas, HII regions, and stars in the $z=2.12$ submillimeter galaxy ALESS67.1
• The Nature of Sub-millimetre Galaxies in Cosmological Hydrodynamic Simulations
• An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: number counts of submillimeter galaxies
• The SCUBA-2 Cosmology Legacy Survey: The clustering of submillimetre galaxies in the UKIDSS UDS field
• HerMES: Clusters of Dusty Galaxies Uncovered by Herschel and Planck
• Resolving the Cosmic Far-Infrared Background at 450 and 850 Microns with SCUBA-2
• SMAObservations of GOODS 850-11 and GOODS 850-13 - First Examples of Multiple Submillimeter Sources Resolved by an Interferometer
• The LABOCA survey of the Extended Chandra Deep Field South - radio and mid-infrared counterparts to submillimetre galaxies
• Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance
• The evolving far-IR galaxy luminosity function and dust-obscured star-formation rate density out to z~5
• A Submillimeter Perspective on the GOODS Fields (SUPER GOODS) - I. An Ultradeep SCUBA-2 Survey of the GOODS-N
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• MAHALO Deep Cluster Survey I. Accelerated and enhanced galaxy formation in the densest regions of a protocluster at z=2.5
• Evolution of cosmic star formation in the SCUBA-2 Cosmology Legacy Survey
• MApping the Most Massive Overdensities Through Hydrogen (MAMMOTH) I: Methodology
• The nature of sub-millimeter and highly star-forming galaxies in the EAGLE simulation
• MAHALO Deep Cluster Survey II. Characterizing massive forming galaxies in the Spiderweb protocluster at z=2.2
• An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
• The SCUBA-2 Cosmology Legacy Survey: Multi-wavelengths counterparts to 10${}^3$ submillimeter galaxies in the UKIDSS-UDS field
• Reproducing sub-millimetre galaxy number counts with cosmological hydrodynamic simulations
• Molecular gas on large circumgalactic scales at z=3.47
• The DIANOGA simulations of galaxy clusters: characterizing star formation in proto-clusters
• A Decade of SCUBA-2: A Comprehensive Guide to Calibrating 450 $\mu$m and 850 $\mu$m Continuum Data at the JCMT
• Searching for large-scale structures around high-redshift radio galaxies with Herschel
• Characterising and Identifying Galaxy Protoclusters
• SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-End Counts at 450 um
• The ThreeHundred: the structure and properties of cosmic filaments in the outskirts of galaxy clusters
• AzTEC/ASTE 1.1 mm survey of SSA22: Counterpart identification and photometric redshift survey of submillimeter galaxies
• Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA
• Rapid early coeval star formation and assembly of the most massive galaxies in the universe
• Herschel protocluster survey: A search for dusty star-forming galaxies in protoclusters at z=2-3
• Observational constraints on the co-evolution of supermassive black holes and galaxies
• A large-scale galaxy structure at z = 2.02 associated with the radio galaxy MRC0156-252
• Submillimetre galaxies in cosmological hydrodynamical simulations -- an opportunity for constraining feedback models
• Two sub-millimetre bright protoclusters bounding the epoch of peak star-formation activity
• Is there enough star formation in simulated protoclusters?
• High-resolution SMA imaging of bright submillimetre sources from the SCUBA-2 Cosmology Legacy Survey
• Overdensity of submillimeter galaxies around the $z\simeq 2.3$ MAMMOTH-1 nebula
• A machine-learning method for identifying multi-wavelength counterparts of submillimeter galaxies: training and testing using AS2UDS and ALESS
• AzTEC 1.1 mm observations of high-z protocluster environments: SMG overdensities and misalignment between AGN jets and SMG distribution
• From large-scale environment to CGM angular momentum to star forming activities -- I: star-forming galaxies
• Observational constraints on the physical nature of submillimetre source multiplicity: chance projections are common
• Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS
• Overdensities of SMGs around WISE-selected, ultra-luminous, high-redshift AGN
• A detailed study of massive galaxies in a protocluster at z=3.13
• Spectroscopic Confirmation of two Extremely Massive Protoclusters BOSS1244 and BOSS1542 at $z=2.24$
• MAMMOTH: Confirmation of Two Massive Galaxy Overdensities at $z=2.24$ with H$\alpha$ Emitters
• AzTEC 1.1 mm images of 16 radio galaxies at 0.5<z<5.2 and a quasar at z=6.3
• The submillimetre view of massive clusters at z~0.8-1.6
• A complete distribution of redshifts for sub-millimetre galaxies in the SCUBA-2 Cosmology Legacy Survey UDS field
• A Multiwavelength Study of ELAN Environments (AMUSE${}^2$): Ubiquitous dusty star-forming galaxies associated with enormous Ly$\alpha$ nebulae on megaparsec scales
• A SCUBA-2 850$\mu$m Survey of Heavily Reddened Quasars at z~2

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• The Young and the Wild: What happens to Protoclusters forming at z = 4?
• Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16
• The JCMT SCUBA-2 Survey of the James Webb Space Telescope North Ecliptic Pole Time-Domain Field
• Environmental dependence of the mass-metallicity relation in cosmological hydrodynamical simulations
• ASW${}^2$DF: Census of the obscured star formation in a galaxy cluster in formation at $z=2.2$
• ALMACAL. XI. Over-densities as signposts to proto-clusters? A cautionary tale
• COALAS III: The ATCA CO(1-0) look at the growth and death of H$\alpha$ emitters in the Spiderweb protocluster at z=2.16
• Deep Submillimetre and Radio Observations in the SSA22 Field. II. Sub-millimetre source catalogue and number counts
• Modeling submillimeter galaxies in cosmological simulations: Contribution to the cosmic star formation density and predictions for future surveys
• JWST reveals extended stellar disks for ALMA-bright dusty star-forming galaxies in the Spiderweb protocluster
• Probing the influence of the protocluster environment on galaxy morphology at z = 2.23