Magnetic field of a ring-like shape molecular cloud
arXiv:2507.19281 · doi:10.3847/1538-3881/adec9f
Abstract
We present a detailed study of the magnetic field structure in the G111 molecular cloud, a ring-like filamentary cloud within the NGC 7538 region. We utilized interstellar dust polarization from the Planck telescope to trace large-scale field orientations, starlight extinction polarization from the Kanata telescope to probe the cloud's magnetic field after foreground subtraction, and velocity gradients derived from CO isotopologues, observed with the IRAP 30m telescope, to examine dense regions. Our results reveal a coherent yet spatially varying magnetic field within G111. We correct the significant foreground dust contamination through careful subtraction. We observe a global alignment of the magnetic field with density structures suggesting that the field is dynamically important in shaping the cloud. The curved magnetic field along the dense regions, coinciding with mid-infrared emission in WISE data, indicates shock compression, likely driven by stellar feedback or supernova remnants. Our findings support a scenario where G111's morphology results from turbulent shock-driven compression. The interplay between magnetic fields and external forces is crucial in shaping and maintaining the structure of the molecular cloud. Future high-resolution observations will be essential to further constrain the magnetic field's role in cloud evolution.
19 pages, 14 figures, Accepted to AJ
References in corpus (48)
- Astropy: A Community Python Package for Astronomy
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Reconnection in a Weakly Stochastic Field
- Physical Conditions in Regions of Star Formation
- Dissipation in Compressible MHD Turbulence
- Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
- Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust
- Velocity Modification of HI Power Spectrum
- The Turbulent Shock Origin of Proto--Stellar Cores
- Formation of Massive Molecular Cloud Cores by Cloud-cloud Collision
- Trigonometric Parallaxes of Massive Star Forming Regions: II. Cep A & NGC 7538
- Magnetically Regulated Star Formation in 3D: The Case of Taurus Molecular Cloud Complex
- On the universality of interstellar filaments: theory meets simulations and observations
- On the origin of non self-gravitating filaments in the ISM
- Formation of Turbulent and Magnetized Molecular Clouds via Accretion Flows of HI Clouds
- Magnetic Nanoparticles in the Interstellar Medium: Emission Spectrum and Polarization
- Velocity Gradients as a Tracer for Magnetic Fields
- Tracing magnetic fields with spectroscopic channel maps
- Planck intermediate results. XXXIII. Signature of the magnetic field geometry of interstellar filaments in dust polarization maps
- Subsonic Mechanical Alignment of Irregular Grains
- Gravitational Infall onto Molecular Filaments
- Tracing interstellar magnetic field using velocity gradient technique: Application to Atomic Hydrogen data
- Alignment of Irregular Grains by Mechanical Torques
- Star Formation triggered by cloud-cloud collisions
- Magnetic Field Morphology in Interstellar Clouds with the Velocity Gradient Technique
- On the formation of density filaments in the turbulent interstellar medium
- The TOP-SCOPE survey of Planck Galactic Cold Clumps: Survey overview and results of an exemplar source, PGCC G26.53+0.17
- Polarization measurements analysis I. Impact of the full covariance matrix on polarization fraction and angle measurements
- Classification of Filament Formation Mechanisms in Magnetized Molecular Clouds
- Formation of HI Clouds in Shock-compressed Interstellar Medium: Physical Origin of Angular Correlation Between Filamentary Structure and Magnetic Field
- Improving the Accuracy of Magnetic Field Tracing by Velocity Gradients: Principal Component Analysis
- The Link between Magnetic Fields and Cloud/Star Formation
- Magnetic Fields in Massive Star-Forming Regions (MagMaR) I. Linear Polarized Imaging of the UCHII Region G5.89-0.39
- Cloud-cloud Collision in the Galactic Center 50 km s Molecular Cloud
- Statistical analysis of the interplay between magnetic fields and filaments hosting Planck Galactic Cold Clumps
- Herschel Reveals Massive Cold Clumps in NGC 7538
- Tracing magnetic field morphology using the Velocity Gradient Technique in the presence of CO self-absorption
- Magnetic Field Orientation in Self-Gravitating Turbulent Molecular Clouds
- Physical Characteristics of a Dark Cloud in an Early Stage of Star Formation toward NGC 7538: an Outer Galaxy Infrared Dark Cloud?
- MHD Stability of ISM Phase Transition Layers I: Magnetic Field Orthogonal to Front
- Large-scale magnetic field in the Monoceros OB-1 East molecular cloud
- Polarized Emission from Interstellar Dust
- The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
- Relative Alignment Between Magnetic Fields and Molecular Gas Structure in Molecular Clouds
- Performance of the polarization leakage correction in the PILOT data