Formation of the Hub-Filament System G33.92+0.11: Local Interplay between Gravity, Velocity, and Magnetic Field

Abstract

The formation of filaments in molecular clouds is an important process in star formation. Hub-filament systems (HFSs) are a transition stage connecting parsec-scale filaments and proto-clusters. Understanding the origin of HFSs is crucial to reveal how star formation proceeds from clouds to cores. Here, we report JCMT POL-2 850 $\mu$m polarization and IRAM 30-m C${}^{18}$O (2-1) line observations toward the massive HFS G33.92+0.11. The 850 $\mu$m continuum map reveals four major filaments converging to the center of G33.92+0.11 with numerous short filaments connecting to the major filaments at local intensity peaks. We estimate the local orientations of filaments, magnetic field, gravity, and velocity gradients from observations, and we examine their correlations based on their local properties. In the high-density areas, our analysis shows that the filaments tend to align with the magnetic field and local gravity. In the low-density areas, we find that the local velocity gradients tend to be perpendicular to both the magnetic field and local gravity, although the filaments still tend to align with local gravity. A global virial analysis suggests that the gravitational energy overall dominates the magnetic and kinematic energy. Combining local and global aspects, we conclude that the formation of G33.92+0.11 is predominantly driven by gravity, dragging and aligning the major filaments and magnetic field on the way to the inner dense center. Traced by local velocity gradients in the outer diffuse areas, ambient gas might be accreted onto the major filaments directly or via the short filaments.

arXiv comment32 pages, 23 figures, accepted for publication in ApJ

References in corpus (76)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Embedded Clusters in Molecular Clouds
• Theory of Star Formation
• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• The Formation of Massive Stars from Turbulent Cores
• Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
• Characterizing interstellar filaments with Herschel in IC5146
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• Re-examining Larson's Scaling Relationships in Galactic Molecular Clouds
• Herschel view of the Taurus B211/3 filament and striations: Evidence of filamentary growth?
• Dissipation in Compressible MHD Turbulence
• Filamentary structure of star-forming complexes
• Large-Scale Structure of the Molecular Gas in Taurus Revealed by High Linear Dynamic Range Spectral Line Mapping
• Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
• Cluster-formation in the Rosette molecular cloud at the junctions of filaments
• Filamentary Accretion Flows in the Embedded Serpens South Protocluster
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• Low Virial Parameters in Molecular Clouds: Implications for High Mass Star Formation and Magnetic Fields
• SCUBA-2: on-sky calibration using submillimetre standard sources
• The Turbulent Shock Origin of Proto--Stellar Cores
• SCUBA Polarization Measurements of the Magnetic Field Strengths in the L183, L1544, and L43 Prestellar Cores
• Dispersion of Magnetic Fields in Molecular Clouds. II
• SDC13 infrared dark clouds: Longitudinally collapsing filaments?
• An ALMA study of the Orion Integral Filament: I. Evidence for narrow fibers in a massive cloud
• Characterizing the properties of nearby molecular filaments observed with Herschel
• Magnetically Regulated Star Formation in 3D: The Case of Taurus Molecular Cloud Complex
• On the universality of interstellar filaments: theory meets simulations and observations
• Filaments in Simulations of Molecular Cloud Formation
• Theoretical Models of Polarized Dust Emission from Protostellar Cores
• Helical Fields and Filamentary Molecular Clouds II - Axisymmetric Stability and Fragmentation
• Physical properties of interstellar filaments
• Formation and evolution of interstellar filaments; Hints from velocity dispersion measurements
• The Pipe Nebula as seen with Herschel: Formation of filamentary structures by large-scale compression ?
• First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould Belt
• Revealing the physical properties of molecular gas in Orion with a large scale survey in J=2-1 lines of 12CO, 13CO and C18O
• Gravity drives the evolution of infrared dark hubs: JVLA observations of SDC13
• Dynamics of cluster-forming hub-filament systems: The case of the high-mass star-forming complex Monoceros R2
• Near-Infrared Imaging Polarimetry Toward Serpens South: Revealing the Importance of the Magnetic Field
• Formation of Magnetized Prestellar Cores with Ambipolar Diffusion and Turbulence
• CARMA Large Area Star Formation Survey: Observational Analysis of Filaments in the Serpens South Molecular Cloud
• Dense core formation in supersonic turbulent converging flows
• Gravitational Infall onto Molecular Filaments
• ALMA resolves the spiraling accretion flow in the luminous OB cluster forming region G33.92+0.11
• Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
• Magnetic Field Strength Maps for Molecular Clouds: A New Method Based on a Polarization - Intensity Gradient Relation
• Gravity, Magnetic Field, and Turbulence: Relative Importance and Impact on Fragmentation in the Infrared Dark Cloud G34.43+00.24
• Cluster Formation Triggered by Filament Collisions in Serpens South
• Probing accretion of ambient cloud material into the Taurus B211/B213 filament
• Abundant cyanopolyynes as a probe of infall in the Serpens South cluster-forming region
• MUSCLE W49 : A Multi-Scale Continuum and Line Exploration of the Most Luminous Star Formation Region in the Milky Way. I. Data and The Mass Structure of the Giant Molecular Cloud
• Anisotropic Formation of Magnetized Cores in Turbulent Clouds
• The CARMA-NRO Orion Survey: The filamentary structure as seen in C${}^{18}$O emission
• A First Look at BISTRO Observations of The $\rho$ Oph-A core
• Fragmentation and OB Star Formation in High-Mass Molecular Hub-Filament System
• JCMT BISTRO survey: Magnetic Fields within the Hub-Filament Structure in IC 5146
• ALMA imaging of the nascent planetary nebula IRAS 15103-5754
• The Importance of the Magnetic Field from an SMA-CSO-Combined Sample of Star-Forming Regions
• Velocity-coherent Filaments in NGC 1333: Evidence for Accretion Flow?
• The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
• Core and filament formation in magnetized, self-gravitating isothermal layers
• Self-gravitating Filament Formation from Shocked Flows: Velocity Gradients across Filaments
• The Origin of OB Clusters: From 10 pc to 0.1 pc
• Magnetized interstellar molecular clouds: II. The Large-Scale Structure and Dynamics of Filamentary Molecular Clouds
• Colliding Filaments and a Massive Dense Core in the Cygnus OB 7 Molecular Cloud
• Magnetically Dominated Parallel Interstellar Filaments at the Infrared Dark Cloud G14.225-0.506
• Quantifying the Significance of the Magnetic Field from Large-Scale Cloud to Collapsing Core: Self-Similarity, Mass-to-Flux Ratio and Star Formation Efficiency
• Gravitational Infall onto Molecular Filaments II. Externally Pressurized Cylinders
• Multi-scale dynamics in star-forming regions: the interplay between gravity and turbulence
• Investigating fragmentation of gas structures in OB cluster-forming molecular clump G33.92+0.11 with 1000 AU resolution observations of ALMA
• Interpreting the Role of the Magnetic Field from Dust Polarization Maps
• Edge collapse and subsequent longitudinal accretion in Filament S242
• Formation of dense structures induced by filament collisions. Correlation of density, kinematics and magnetic field in the Pipe nebula
• Multicomponent kinematics in a massive filamentary IRDC

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• Dust polarized emission observations of NGC 6334; BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network
• Does the magnetic field suppress fragmentation in massive dense cores?
• Magnetic fields in star formation: a complete compilation of all the DCF estimations
• The strength and structure of the magnetic field in the galactic outflow of M82
• B-fields in Star-Forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
• A cold accretion flow onto one component of a multiple protostellar system
• The core population and kinematics of a massive clump at early stages: an ALMA view
• The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
• Simultaneous evidence of edge collapse and hub-filament configurations: A rare case study of a Giant Molecular Filament G45.3+0.1
• Rotating filament in Orion B: Do cores inherit their angular momentum from their parent filament?
• Formation of the SDC13 Hub-Filament System: A Cloud-Cloud Collision Imprinted on The Multiscale Magnetic Field
• Tracing the Milky Way's Vestigial Nuclear Jet
• A Multi-Scale Picture of Magnetic Field and Gravity from Large-Scale Filamentary Envelope to Core-Accreting Dust Lanes in the High-Mass Star-Forming Region W51
• Evolution of the Hub-filament Structures in IC 5146 in the Context of the Energy Balance of Gravity, Turbulence, and Magnetic Field
• Kinematics and star formation of hub-filament systems in W49A
• IC 5146 dark Streamer: is a first reliable candidate of edge collapse, hub-filament systems, and intertwined sub-filaments?
• Spiral Structure and Massive Star formation in the Hub-Filament-System G326.27-0.49
• Emergence of high-mass stars in complex fiber networks (EMERGE) V. From filaments to spheroids: the origin of the hub-filament systems
• Evolution of magnetized hub-filament systems: Comparing the observed properties of W3(OH), W3 Main, and S 106
• Random gas motions inside sub-parsec scale supercritical filaments
• Kronberger 55: A Candidate for End-dominated Collapse Scenario
• The influence of magnetic fields in Cloud-Cloud Collisions
• Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cepheus A
• A Core Mass Function Indistinguishable from the Salpeter Stellar Initial Mass Function Using 1000 au Resolution ALMA Observations
• Evolution of compressed clouds formed by filament coalescence. I. Oblique collisions
• Interstellar filament detection and characterization: methods and implications for studies of magnetized interstellar medium