A non-corotating gas component in an extreme starburst at z=4.3

Abstract

We report the detection of a non-corotating gas component in a bright unlensed submillimeter galaxy at z=4.3, COSMOS-AzTEC-1, hosting a compact starburst. ALMA 0.17 and 0.09 arcsec resolution observations of [CII] emission clearly demonstrate that the gas kinematics is characterized by an ordered rotation. After subtracting the best-fit model of a rotating disk, we kinematically identify two residual components in the channel maps. Both observing simulations and analysis of dirty images confirm that these two subcomponents are not artificially created by noise fluctuations and beam deconvolution. One of the two has a velocity offset of 200 km/s and a physical separation of 2 kpc from the primary disk and is located along the kinematic minor axis of disk rotation. We conclude that this gas component is falling into the galaxy from a direction perpendicular to the disk rotation. The accretion of such small non-corotating gas components could stimulate violent disk instability, driving radial gas inflows into the center of galaxies and leading to formation of in-situ clumps such as identified in dust continuum and CO. We require more theoretical studies on high gas fraction mergers with mass ratio of 1:>10 to verify this process.

arXiv comment10 pages, 8 figures. Accepted for publication in ApJ. GIF images of [CII] line emission are available at https://alma-intweb.mtk.nao.ac.jp/~tadaki/tadaki+20/Tadaki+20_Figure3.gif

References in corpus (66)

• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field
• Dusty Star-Forming Galaxies at High Redshift
• Submillimeter Galaxies at z~2: Evidence for Major Mergers & Constraints on Lifetimes, IMF and CO-H2 Conversion Factor
• The SINS survey of z~2 galaxy kinematics: properties of the giant star forming clumps
• Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
• A Merger-Driven Scenario for Cosmological Disk Galaxy Formation
• The Resolved Properties of Extragalactic Giant Molecular Clouds
• Multi-Scale CLEAN deconvolution of radio synthesis images
• Wet Disc Contraction to Galactic Blue Nuggets and Quenching to Red Nuggets
• Two bright submillimeter galaxies in a z=4.05 proto-cluster in GOODS-North, and accurate radio-infrared photometric redshifts
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• Forming Compact Massive Galaxies
• Sub-millimeter galaxies as progenitors of compact quiescent galaxies
• A massive proto-cluster of galaxies at a redshift of z {\approx} 5.3
• Multiple minor mergers: formation of elliptical galaxies and constraints for the growth of spiral disks
• The Deep2 Galaxy Redshift Survey: Evolution of Close Galaxy Pairs and Major-Merger Rates Up to z ~ 1.2
• Stellar Populations in Ten Clump-Cluster Galaxies of the Ultra Deep Field
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the rest-frame far-infrared emission of sub-millimeter galaxies
• Extremely compact massive galaxies at z~1.4
• History of Galaxy Interactions and their Impact on Star Formation over the Last 7 Gyr from GEMS
• 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
• Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
• ALMA Imaging of Gas and Dust in a Galaxy Protocluster at Redshift 5.3: [CII] Emission in "Typical" Galaxies and Dusty Starbursts ~1 Billion Years after the Big Bang
• Compact starbursts in z~3-6 submillimeter galaxies revealed by ALMA
• An extreme proto-cluster of luminous dusty starbursts in the early Universe
• Herschel-ATLAS: a binary HyLIRG pinpointing a cluster of starbursting proto-ellipticals
• Red Nuggets at High Redshift: Structural Evolution of Quiescent Galaxies Over 10 Gyr of Cosmic History
• The role of minor mergers in the recent star formation history of early-type galaxies
• ALMA reveals potential evidence for spiral arms, bars, and rings in high-redshift submillimeter galaxies
• GalPak3D: A Bayesian parametric tool for extracting morpho-kinematics of galaxies from 3D data
• ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8
• High-redshift major mergers weakly enhance star formation
• The Physical Scale of the Far-Infrared Emission in the Most Luminous Submillimeter Galaxies
• Cold Molecular Gas in Merger Remnants: I. Formation of Molecular Gas Disks
• Gas-rich mergers and feedback are ubiqitous amongst starbursting radio galaxies, as revealed by JVLA, IRAM PdBI and Herschel
• Non-linear violent disc instability with high Toomre's Q in high-redshift clumpy disc galaxies
• Morphology and Molecular Gas Fractions of Local Luminous Infrared Galaxies as a Function of Infrared Luminosity and Merger Stage
• A gravitationally unstable gas disk of a starburst galaxy 12 billion years ago
• Shocked Superwinds from the z~2 Clumpy Star-forming Galaxy, ZC406690
• The significant contribution of minor mergers to the cosmic star formation budget
• The dust and [CII] morphologies of redshift ~4.5 sub-millimeter galaxies at ~200pc resolution: The absence of large clumps in the interstellar medium of high-redshift galaxies
• ALMA maps the Star-Forming Regions in a Dense Gas Disk at z~3
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• Hidden in plain sight: a massive, dusty starburst in a galaxy protocluster at z=5.7 in the COSMOS field
• Physical Characterization of an Unlensed Dusty Star-Forming Galaxy at $z=5.85$
• ALMA 200-parsec Resolution Imaging of Smooth Cold Dusty Disks in Typical $z\sim 3$ Star-Forming Galaxies
• Early- and late-stage mergers among main sequence and starburst galaxies at 0.2<z<2
• CO(1-0) line imaging of massive star-forming disc galaxies at z=1.5-2.2
• Strong FUV fields drive the [CII]/FIR deficit in z~3 dusty, star-forming galaxies
• High-resolution spectroscopic imaging of CO in a z=4.05 proto-cluster
• ALMA 26 Arcmin${}^2$ Survey of GOODS-S at One-millimeter (ASAGAO): Average Morphology of High-$z$ Dusty Star-Forming Galaxies is an Exponential-Disk ($n\simeq 1$)
• Spatially Resolved [CII] Emission in SPT0346-52: A Hyper-Starburst Galaxy Merger at z~5.7
• Connecting Clump Sizes in Turbulent Disk Galaxies to Instability Theory
• A model-based approach to the spatial and spectral calibration of NIRSpec onboard JWST
• Clumpy and Extended Starbursts in the Brightest Unlensed Submillimeter Galaxies
• A Survey of Merger Remnants III: Are Merger Remnants Supported by Rotation or Anisotropy
• CNO emission of an unlensed submillimeter galaxy at z=4.3
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies III. Environments
• An ALMA survey of CO in submillimetre galaxies: companions, triggering, and the environment in blended sources
• Merger induced clump formation in distant infrared luminous starburst galaxies
• Dark influences II: gas and star formation in minor mergers of dwarf galaxies with dark satellites

Cited by in corpus (16)

• Dynamical properties of z $\sim 4.5$ dusty star-forming galaxies and their connection with local early type galaxies
• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• A kiloparsec view of a typical star-forming galaxy when the Universe was ~1 Gyr old. Part I. Outflow, halo, and interstellar medium properties
• Structural evolution in massive galaxies at z~2
• The ALPINE-ALMA [CII] Survey: Kinematic Diversity & Rotation in Massive Star Forming Galaxies at z~4.4-5.9
• Regular rotation and low turbulence in a diverse sample of z ~ 4.5 galaxies observed with ALMA
• The ALMA-CRISTAL survey: Widespread dust-obscured star formation in typical star-forming galaxies at z=4-6
• The PUMA project. III. Incidence and properties of ionised gas disks in ULIRGs, associated velocity dispersion and its dependence on starburstiness
• Rise of the Titans: Gas Excitation and Feedback in a Binary Hyper-Luminous Dusty Starburst Galaxy at z~6
• Resolving Disks & Mergers in $z\sim 2$ Heavily Reddened Quasars and their Companion Galaxies with ALMA
• JWST/MIRI unveils the stellar component of the GN20 dusty galaxy overdensity at $z$=4.05
• Central concentration of warm and dense molecular gas in a strongly lensed submillimeter galaxy at z=6
• Formation of Substructure in Luminous Submillimeter Galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies
• Deep Observations of CO and Free-Free Emission in Ultraluminous Infrared QSO IRAS F07599+6508
• Investigating the role of turbulence in the interstellar medium in $z\sim 3$ dusty star-forming galaxies using kpc-resolution ALMA dust and gas maps
• AGN Feedback: The impact of galactic-scale radio jets on the interstellar medium in starbursting obscured AGN