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

Abstract

[Abridged] Filaments and hubs have received special attention recently thanks to studies showing their role in star formation. While the column density and velocity structures of both filaments and hubs have been studied, their magnetic fields (B-field) are not yet characterized. We aim to understand the role of the B-field in the dynamical evolution of the NGC 6334 hub-filament network. We present new observations of the dust polarized emission at 850$\mu$m towards NGC 6334 obtained with the JCMT/POL-2. We study the distribution and dispersion of the polarized intensity ($PI$), the polarization fraction ($PF$), and the B-field angle (${\theta }_B$). We derive the power spectrum of the intensity and ${\theta }_B$ along the ridge crest. Our analyses show a complex B-field structure when observed over the whole region ($\sim 10$ pc), however, at smaller scales ($\sim 1$ pc), ${\theta }_B$ varies coherently along the filaments. The observed power spectrum of ${\theta }_B$ can be well represented with a power law function with a slope $-1.33\pm 0.23$, which is $\sim 20\%$ shallower than that of $I$. This result is compatible with the properties of simulated filaments and may indicate the processes at play in the formation of filaments. ${\theta }_B$ rotates from being mostly perpendicular to the filament crests to mostly parallel as they merge with the hubs. This variation of ${\theta }_B$ may be tracing local velocity flows of matter in-falling onto the hubs. Our analysis suggests a variation of the energy balance along the crests of these filaments, from magnetically critical/supercritical at their far ends to magnetically subcritical near the hubs. We detect an increase of $PF$ towards the high-column density star cluster-forming hubs that may result from the increase of grain alignment efficiency due to stellar radiation from the newborn stars.

arXiv commentAccepted for publication in Astronomy & Astrophysics

References in corpus (100)

• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• Characterizing interstellar filaments with Herschel in IC5146
• The persistent cosmic web and its filamentary structure I: Theory and implementation
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Herschel view of the Taurus B211/3 filament and striations: Evidence of filamentary growth?
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• Filamentary structure of star-forming complexes
• Radiative torques: Analytical Model and Basic Properties
• Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust
• Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
• Cores, filaments, and bundles: hierarchical core formation in the L1495/B213 Taurus region
• Tracing Magnetic Fields with Aligned Grains
• Global collapse of molecular clouds as a formation mechanism for the most massive stars
• Dynamic star formation in the massive DR21 filament
• Cluster-formation in the Rosette molecular cloud at the junctions of filaments
• Helical Fields and Filamentary Molecular Clouds
• Filamentary Accretion Flows in the Embedded Serpens South Protocluster
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• SCUBA-2: on-sky calibration using submillimetre standard sources
• The persistent cosmic web and its filamentary structure II: Illustrations
• An Imprint of Molecular Cloud Magnetization in the Morphology of the Dust Polarized Emission
• SCUBA Polarization Measurements of the Magnetic Field Strengths in the L183, L1544, and L43 Prestellar Cores
• Filaments and ridges in Vela C revealed by Herschel: from low-mass to high-mass star-forming sites
• SDC13 infrared dark clouds: Longitudinally collapsing filaments?
• An ALMA study of the Orion Integral Filament: I. Evidence for narrow fibers in a massive cloud
• Formation of Massive Molecular Cloud Cores by Cloud-cloud Collision
• The spine of the swan: A Herschel study of the DR21 ridge and filaments in Cygnus X
• Characterizing the properties of nearby molecular filaments observed with Herschel
• Magnetic Fields and Massive Star Formation
• Placing Confidence Limits on Polarization Measurements
• Studies of regular and random magnetic fields in the ISM: statistics of polarization vectors and the Chandrasekhar-Fermi technique
• A census of dense cores in the Aquila cloud complex: SPIRE/PACS observations from the Herschel Gould Belt survey
• Magnetic Field Diagnostics Based on Far-Infrared Polarimetry: Tests Using Numerical Simulations
• MALT90: The Millimetre Astronomy Legacy Team 90 GHz Survey
• The Efficiency of Grain Alignment in Dense Interstellar Clouds: A Reassessment of Constraints from Near Infrared Polarization
• Unifying low and high mass star formation through density amplified hubs of filaments
• Chains of dense cores in the Taurus L1495/B213 complex
• Physical properties of interstellar filaments
• Large-scale filaments associated with Milky Way spiral arms
• Formation and evolution of interstellar filaments; Hints from velocity dispersion measurements
• A unified model of grain alignment: radiative alignment of interstellar grains with magnetic inclusions
• First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould Belt
• A novel estimator of the polarization amplitude from normally distributed Stokes parameters
• The Herschel and JCMT Gould Belt Surveys: Constraining Dust Properties in the Perseus B1 Clump with PACS, SPIRE, and SCUBA-2
• Self-similar Fragmentation Regulated by Magnetic Fields in a Massive Star Forming Filament
• Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
• Grain Alignment by Radiative Torques in Special Conditions and Implications
• Gravity drives the evolution of infrared dark hubs: JVLA observations of SDC13
• On the efficiency of grain alignment in dark clouds
• First results from the Herschel Gould Belt Survey in Taurus
• Near-Infrared Imaging Polarimetry Toward Serpens South: Revealing the Importance of the Magnetic Field
• Rotational Disruption of Dust Grains by Radiative Torques in Strong Radiation Fields
• Planck intermediate results. XXXIII. Signature of the magnetic field geometry of interstellar filaments in dust polarization maps
• Grain Alignment by Radiation in Dark Clouds and Cores
• Characterizing filaments in regions of high-mass star formation: High-resolution submilimeter imaging of the massive star-forming complex NGC 6334 with ArTéMiS
• Filamentary Accretion Flows in the Infrared Dark Cloud G14.225-0.506 Revealed by ALMA
• Resolving the fragmentation of high line-mass filaments with ALMA: the integral shaped filament in Orion A
• The earliest phases of high-mass star formation, as seen in NGC 6334 by \emph{Herschel}
• Magnetized filamentary gas flows feeding the young embedded cluster in Serpens South
• Grain Alignment in Starless Cores
• The role of molecular filaments in the origin of the prestellar core mass function and stellar initial mass function
• Magnetic fields towards Ophiuchus-B derived from SCUBA-2 polarization measurements
• Results of SPARO 2003: Mapping Magnetic Fields in Giant Molecular Clouds
• Magnetohydrostatic Equilibrium Structure and Mass of Filamentary Isothermal Cloud Threaded by Lateral Magnetic Field
• Planck intermediate results. XXXII. The relative orientation between the magnetic field and structures traced by interstellar dust
• A First Look at BISTRO Observations of The $\rho$ Oph-A core
• Evolution of Magnetic Fields in High Mass Star Formation: SMA dust polarization image of the UCHII region G5.89-0.39
• JCMT BISTRO survey: Magnetic Fields within the Hub-Filament Structure in IC 5146
• ALMA imaging of the nascent planetary nebula IRAS 15103-5754
• The magnetic field structure in molecular cloud filaments
• JCMT BISTRO Survey observations of the Ophiuchus Molecular Cloud: Dust grain alignment properties inferred using a Ricean noise model
• Helical Magnetic Fields in Molecular Clouds? A New Method to Determine the Line-of-Sight Magnetic Field Structure in Molecular Clouds
• The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-Forming Region
• The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333
• Molecular filament formation and filament-cloud interaction: Hints from Nobeyama 45m telescope observations
• Magnetic field morphology in nearby molecular clouds as revealed by starlight and submillimetre polarization
• Probing fragmentation and velocity sub-structure in the massive NGC 6334 filament with ALMA
• A possible link between the power spectrum of interstellar filaments and the origin of the prestellar core mass function
• Physical Model of Dust Polarization by Radiative Torque Alignment and Disruption and Implications for Grain Internal Structures
• Formation of the Musca filament: Evidence for asymmetries in the accretion flow due to a cloud-cloud collision
• Massive Clumps in the NGC 6334 Star Forming Region
• Polarization Properties and Magnetic Field Structures in the High-Mass Star-Forming Region W51 Observed with ALMA
• Interstellar extinction and interstellar polarization: old and new models
• Formation of the Hub-Filament System G33.92+0.11: Local Interplay between Gravity, Velocity, and Magnetic Field
• A statistical analysis of dust polarization properties in ALMA observations of Class 0 protostellar cores
• Molecular clouds in the NGC 6334 and NGC 6357 region; Evidence for a 100 pc-scale cloud-cloud collision triggering the Galactic mini-starbursts
• Physical Properties of the star-forming clusters in NGC 6334
• Planck intermediate results. XXXIV. The magnetic field structure in the Rosette Nebula
• KFPA Examinations of Young STellar Object Natal Environments (KEYSTONE): Hierarchical Ammonia Structures in Galactic Giant Molecular Clouds
• Magnetized converging flows towards the hot core in the intermediate/high-mass star-forming region NGC 6334 V
• The role of Galactic HII regions in the formation of filaments. High-resolution submilimeter imaging of RCW 120 with ArTéMiS
• APEX CO (9-8) Mapping of an Extremely High-Velocity and Jet-like Outflow in a High-Mass Star-Forming Region
• The Responses of Magnetically Sub-Critical Cores to Shocks
• An Origin for the Angular Momentum of Molecular Cloud Cores: a Prediction from Filament Fragmentation
• Planck intermediate results. XLIV. The structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap
• The Magnetized Environment of the W3(H2O) Protostars
• Bow Magnetic Morphology Surrounding Filamentary Molecular Clouds? 3D Magnetic Field Structure of Orion-A
• Quantifying the interplay between gravity and magnetic field in molecular clouds - a possible multi-scale energy equipartition in NGC6334

Cited by in corpus (48)

• Does the magnetic field suppress fragmentation in massive dense cores?
• Magnetic fields in star formation: a complete compilation of all the DCF estimations
• Filament coalescence and hub structure in MonR2: Implications to massive star and cluster formation
• 3D magnetic field morphology of the Perseus molecular cloud
• The JCMT BISTRO Survey: The Distribution of Magnetic Field Strengths towards the OMC-1 Region
• A cold accretion flow onto one component of a multiple protostellar system
• B-fields in Star-Forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
• Magnetic Fields in Massive Star-Forming Regions (MagMaR) II. Tomography Through Dust and Molecular Line Polarization in NGC 6334I(N)
• The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
• The JCMT BISTRO-2 Survey: Magnetic Fields of the Massive DR21 Filament
• Multi-scale physical properties of NGC 6334 as revealed by local relative orientations between magnetic fields, density gradients, velocity gradients, and gravity
• Velocity structure of the 50 pc-long NGC 6334 filamentary cloud: Hints of multiple compressions and their impact on the cloud properties?
• JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334
• The SOFIA FEEDBACK Legacy Survey: Dynamics and mass ejection in the bipolar HII region RCW 36
• B-fields And dust in interstelLar fiLAments using Dust POLarization (BALLAD-POL): I. The massive filament G11.11-0.12 observed by SOFIA/HAWC+
• SOFIA observations of 30 Doradus: I -- Far-Infrared dust polarization and implications for grain alignment and disruption by radiative torques
• The Magnetic Field in the Milky Way Filamentary Bone G47
• 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
• The widths of magnetised filaments in molecular clouds
• The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333
• Evolution of the Angular Momentum of Molecular Cloud Cores Formed from Filament Fragmentation
• The JCMT BISTRO Survey: Studying the Complex Magnetic Field of L43
• AFGL 5180 and AFGL 6366S: sites of hub-filament systems at the opposite edges of a filamentary cloud
• Evolution of the Hub-filament Structures in IC 5146 in the Context of the Energy Balance of Gravity, Turbulence, and Magnetic Field
• Three-dimensional magnetic fields of molecular clouds
• Magnetic Fields and Fragmentation of Filaments in the Hub of California-X
• The Role of Magnetic Fields in the Stability and Fragmentation of Filamentary Molecular Clouds: Two Case Studies at OMC-3 and OMC-4
• IC 5146 dark Streamer: is a first reliable candidate of edge collapse, hub-filament systems, and intertwined sub-filaments?
• Magnetic fields and outflows in the large Bok globule CB 54
• Emergence of high-mass stars in complex fiber networks (EMERGE) V. From filaments to spheroids: the origin of the hub-filament systems
• The Role of Magnetic Fields in the Formation of the Filamentary Infrared Dark Cloud G11.11-0.12
• Relative alignment between gas structures and magnetic field in Orion A at different scales using different molecular gas tracers
• Simulation of Head-on Collisions Between Filamentary Molecular Clouds Threaded by a Lateral Magnetic Field and Subsequent Evolution
• A Tale of Three: Magnetic Fields along the Orion Integral-Shaped Filament as Revealed by JCMT BISTRO survey
• Ionising feedback from an O star formed in a shock-compressed layer
• Deviation from a Continuous and Universal Turbulence Cascade in NGC 6334 due to Massive Star Formation Activity
• Different molecular filament widths as tracers of accretion onto filaments
• Line emission from filaments in molecular clouds
• A systematic bias in fitting the surface-density profiles of interstellar filaments
• The Formation of Filaments and Dense cores in the Cocoon Nebula (IC~5146)
• Evolution of magnetized hub-filament systems: Comparing the observed properties of W3(OH), W3 Main, and S 106
• A multi-scale view of the magnetic field morphology in the hot molecular core G31.41+0.31
• Dust destruction by the supernova remnant forward shock in a turbulent interstellar medium
• The Impact of Expanding HII Regions on Filament G37:Curved Magnetic Field and Multiple Direction Material Flows
• Evolution of compressed clouds formed by filament coalescence. I. Oblique collisions
• Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cepheus A
• The influence of magnetic fields in Cloud-Cloud Collisions
• A complete survey of filaments in Cygnus X