Anisotropic Turbulence in Position-Position-Velocity Space: Probing Three-Dimensional Magnetic Fields
arXiv:2104.02842 · doi:10.3847/1538-4357/ac00ab
Abstract
Direct measurements of three-dimensional magnetic fields in the interstellar medium (ISM) are not achievable. However, the anisotropic nature of magnetohydrodynamic (MHD) turbulence provides a novel way of tracing the magnetic fields. Guided by the advanced understanding of turbulence's anisotropy in the Position-Position-Velocity (PPV) space, we extend the Structure-Function Analysis (SFA) to measure both the three-dimensional magnetic field orientation and Alfven Mach number , which provides the information on magnetic field strength. Following the theoretical framework developed in Kandel et al. (2016), we find that the anisotropy in a given velocity channel is affected by the inclination angle between the 3D magnetic field direction and the line-of-sight as well as media magnetization. We analyze the synthetic PPV cubes generated by incompressible and compressible MHD simulations. We confirm that the PPV channel's intensity fluctuations measured in various position angles reveal plane-of-the-sky magnetic field orientation. We show that by varying the channel width, the anisotropies of the intensity fluctuations in PPV space can be used to simultaneously estimate both magnetic field inclination angle and strength of total magnetic fields.
arXiv comment22 pages, 17 figures, accepted for publication in ApJ
References in corpus (62)
- Gaia Data Release 2. Summary of the contents and survey properties
- The Gaia mission
- Interstellar Turbulence I: Observations and Processes
- Reconnection in a Weakly Stochastic Field
- The Anisotropy of MHD Alfvénic Turbulence
- Simulations of Incompressible MHD Turbulence
- Compressible Magnetohydrodynamic Turbulence: mode coupling, scaling relations, anisotropy, new regime and astrophysical implications
- 9286 Stars: An Agglomeration of Stellar Polarization Catalogs
- Tracing Magnetic Fields with Aligned Grains
- Simulations of MHD Turbulence in a Strongly Magnetized Medium
- Velocity Modification of HI Power Spectrum
- Simulating Radiating and Magnetized Flows in Multi-Dimensions with ZEUS-MP
- Magnetic fields and spiral arms in the galaxy M51
- Density Fluctuations in MHD Turbulence: Spectra, Intermittency and Topology
- Extending Big Power Law in the Sky with Turbulence Spectra from WHAM data
- 3D Turbulent Reconnection: Theory, Tests and Astrophysical Implications
- Planck 2018 results. XII. Galactic astrophysics using polarized dust emission
- Estimating extragalactic Faraday rotation
- Velocity Modification of Power Spectrum from Absorbing Medium
- Density scaling and anisotropy in supersonic MHD turbulence
- Deep 1.4 GHz VLA Observations of the Radio Halo and Relic in Abell 2256
- The Southern Galactic Plane Survey: Polarized Radio Continuum Observations and Analysis
- Velocity centroids as tracers of the turbulent velocity statistics
- Neutral hydrogen structures trace dust polarization angle: Implications for cosmic microwave background foregrounds
- Velocity Gradients as a Tracer for Magnetic Fields
- Tracing magnetic fields with spectroscopic channel maps
- Obtaining Spectra of Turbulent Velocity from Observations
- Subsonic Mechanical Alignment of Irregular Grains
- Mapping the Magnetic Interstellar Medium in Three Dimensions Over the Full Sky with Neutral Hydrogen
- Tracing interstellar magnetic field using velocity gradient technique: Application to Atomic Hydrogen data
- Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
- Spectrum and Anisotropy of Turbulence from Multi-Frequency Measurement of Synchrotron Polarization
- Magnetic Field Morphology in Interstellar Clouds with the Velocity Gradient Technique
- Distribution of velocity gradient orientations: Mapping magnetization with the Velocity Gradient Technique
- On the formation of density filaments in the turbulent interstellar medium
- Measuring the Alfvenic Nature of the Interstellar Medium: Velocity Anisotropy Revisited
- Extending Velocity Channel Analysis for Studying Turbulence Anisotropies
- Gradients of Synchrotron Polarization: Tracing 3D distribution of magnetic fields
- Improving the Accuracy of Magnetic Field Tracing by Velocity Gradients: Principal Component Analysis
- Velocity Anisotropy as a Diagnostic of the Magnetization of the Interstellar Medium and Molecular clouds
- Interpretation of the structure function of rotation measure in the interstellar medium
- Optical polarization map of the Polaris Flare with RoboPol
- Polarization of absorption lines as a diagnostics of circumstellar, interstellar and intergalactic magnetic fields: Fine structure atoms
- Study of velocity centroids based on the theory of fluctuations in position-position-velocity space
- Revealing Gravitational Collapse in Serpens G3-G6 Molecular Cloud using Velocity Gradients
- Technique for separating velocity and density contributions in spectroscopic data and its application to studying turbulence and magnetic fields
- Atomic alignment and Diagnostics of Magnetic Fields in Diffuse Media
- Velocity Gradient in the Presence of Self-Gravity: Identifying Gravity-induced Inflow and Determining Collapsing Stage
- Measuring Turbulence with Young Stars in the Orion Complex
- Anisotropies in Compressible MHD Turbulence: Probing Magnetic Fields and Measuring Magnetization
- A New Method to Trace Three-dimensional Magnetic Field Structure within Molecular Clouds Using Dust Polarization
- Polarization from aligned atoms as a diagnostics of circumstellar, AGN and interstellar magnetic fields: II. Atoms with Hyperfine Structure
- Linewidth Differences of Neutrals and Ions Induced by MHD Turbulence
- Statistical tracing of magnetic fields: comparing and improving the techniques
- Producing Synthetic Maps of Dust Polarization using Velocity Channel Gradient Technique
- Tracing Multi-Scale Magnetic Field Structure Using Multiple Chemical Tracers in Giant Molecular Clouds
- Tracing Magnetic Fields with Ground State Alignment
- Predictions of Cosmic Microwave Background Foregrounds Dust Polarization Using Velocity Gradients
- Probing Magnetic Field Morphology in Galaxy Clusters with the Gradient Technique
- Measuring magnetization with rotation measures and velocity centroids in supersonic MHD turbulence
- Study Turbulence and Probe Magnetic Field Using Gradients Technique: Application to HI-to-H2 Transition Regions
- Non-locality of Hydrodynamic and Magnetohydrodynamic Turbulence
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- Magnetic field properties in star formation: a review of their analysis methods and interpretation
- Magnetic field strength from turbulence theory (I): Using differential measure approach (DMA)
- Turbulence in Milky Way Star-Forming Regions Traced by Young Stars and Gas
- The Velocity Statistics of Turbulent Clouds in the Presence of Gravity, Magnetic fields, Radiation, and Outflow Feedback
- Role of magnetic fields in fueling Seyfert nuclei
- Probing Three-Dimensional Magnetic Fields: I -- Polarized Dust Emission
- Decomposing Magnetic Fields in Three Dimensions over the Central Molecular Zone
- Mapping the Galactic Magnetic Field Orientation and Strength in Three Dimensions
- Three-dimensional magnetic fields of molecular clouds
- A Multiwavelength Study of the Sgr B Region: Contiguous Cloud-Cloud Collisions Triggering Widespread Star Formation Events?
- Studying the properties of compressible MHD turbulence by synchrotron fluctuation statistics
- Parallel and Perpendicular Alignments of Velocity Gradient and Magnetic Field observed in the Molecular Clouds L1478 and L1482