TurbuStat: Turbulence Statistics in Python

Abstract

We present TurbuStat (v1.0): a Python package for computing turbulence statistics in spectral-line data cubes. TurbuStat includes implementations of fourteen methods for recovering turbulent properties from observational data. Additional features of the software include: distance metrics for comparing two data sets; a segmented linear model for fitting lines with a break-point; a two-dimensional elliptical power-law model; multi-core fast-fourier-transform support; a suite for producing simulated observations of fractional Brownian Motion fields, including two-dimensional images and optically-thin HI data cubes; and functions for creating realistic world coordinate system information for synthetic observations. This paper summarizes the TurbuStat package and provides representative examples using several different methods. TurbuStat is an open-source package and we welcome community feedback and contributions.

Accepted in AJ. 21 pages, 8 figures

References in corpus (95)

• emcee: The MCMC Hammer
• scikit-image: Image processing in Python
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Theory of Star Formation
• Interstellar Turbulence I: Observations and Processes
• Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
• The Star Formation Rate of Turbulent Magnetized Clouds: Comparing Theory, Simulations, and Observations
• The Statistics of Supersonic Isothermal Turbulence
• Structural Analysis of Molecular Clouds: Dendrograms
• Compressible Magnetohydrodynamic Turbulence: mode coupling, scaling relations, anisotropy, new regime and astrophysical implications
• The Density Probability Distribution in Compressible Isothermal Turbulence: Solenoidal versus Compressive Forcing
• The Star Formation Law in Atomic and Molecular Gas
• Regulation of Star Formation Rates in Multiphase Galactic Disks: a Thermal/Dynamical Equilibrium Model
• Velocity Modification of HI Power Spectrum
• A Unified Model for Galactic Discs: Star Formation, Turbulence Driving, and Mass Transport
• Density Fluctuations in MHD Turbulence: Spectra, Intermittency and Topology
• Extending Big Power Law in the Sky with Turbulence Spectra from WHAM data
• Density Studies of MHD Interstellar Turbulence: Statistical Moments, Correlations and Bispectrum
• Low-Mach-number turbulence in interstellar gas revealed by radio polarization gradients
• Velocity and density spectra of the Small Magellanic Cloud
• Velocity Modification of Power Spectrum from Absorbing Medium
• The Two States of Star Forming Clouds
• Scaling relations of supersonic turbulence in star-forming molecular clouds
• Magnetically Aligned Velocity Anisotropy in the Taurus Molecular Cloud
• Characterizing Magnetohydrodynamic Turbulence in the Small Magellanic Cloud
• Molecular clouds have power-law probability distribution functions
• Velocity centroids as tracers of the turbulent velocity statistics
• The Star Formation Rate in the Gravoturbulent Interstellar Medium
• Studying Turbulence using Doppler-broadened lines: Velocity Coordinate Spectrum
• Velocity Gradients as a Tracer for Magnetic Fields
• Quantifying Observational Projection Effects Using Molecular Cloud Simulations
• The Power Spectrum of Supersonic Turbulence in Perseus
• Obtaining Spectra of Turbulent Velocity from Observations
• Interstellar Turbulence: II. Energy Spectra of Molecular Regions in the Outer Galaxy
• Velocity Spectrum for HI at High Latitudes
• Tracing interstellar magnetic field using velocity gradient technique: Application to Atomic Hydrogen data
• Tsallis statistics as a tool for studying interstellar turbulence
• The Turbulence Spectrum of Molecular Clouds in the Galactic Ring Survey: A Density-Dependent PCA Calibration
• Unveiling the Role of the Magnetic Field at the Smallest Scales of Star Formation
• The Spectral Correlation Function -- A New Tool for Analyzing Spectral-Line Maps
• GHIGLS: HI mapping at intermediate Galactic latitude using the Green Bank Telescope
• Structure Function Scaling in the Taurus and Perseus Molecular Cloud Complexes
• On the use of fractional Brownian motion simulations to determine the 3D statistical properties of interstellar gas
• The elliptical power law profile lens
• Super-Sonic Turbulence in the Perseus Molecular Cloud
• Observational Diagnostics of Self-Gravitating MHD Turbulence in Giant Molecular Clouds
• Distribution of velocity gradient orientations: Mapping magnetization with the Velocity Gradient Technique
• Dust and gas power-spectrum in M33 (HERM33ES)
• Properties of Interstellar Turbulence from Gradients of Linear Radio Polarization Maps
• Structure analysis of interstellar clouds: I. Improving the Delta-variance method
• Emissivity Statistics in Turbulent, Compressible MHD Flows and the Density-Velocity Correlation
• Statistics of Velocity from Spectral Data: Modified Velocity Centroids
• The HI-to-H2 Transition in a Turbulent Medium
• The Razor's Edge of Collapse: The Transition Point from Lognormal to Powerlaw in Molecular Cloud PDFs
• Velocity statistics from spectral line data: effects of density-velocity correlations, magnetic field, and shear
• Studying Turbulence from Doppler-broadened Absorption Lines: Statistics of Logarithms of Intensity
• The Turbulence Power Spectrum in Optically Thick Interstellar Clouds
• The Turbulence Velocity Power Spectrum of Neutral Hydrogen in the Small Magellanic Cloud
• Turbulence Spectra from Spectral Lines: Tests of the Velocity Channel Analysis and Velocity Coordinate Spectrum Techniques
• Hierarchical Structure of Magnetohydrodynamic Turbulence In Position-Position-Velocity Space
• Measuring the Alfvenic Nature of the Interstellar Medium: Velocity Anisotropy Revisited
• Extending Velocity Channel Analysis for Studying Turbulence Anisotropies
• The structure of self-gravitating clouds
• The Anatomy of the Column Density Probability Distribution Function (N-PDF)
• The Spectral Correlation Function of Molecular Clouds: A Statistical Test for Theoretical Models
• Galactic interstellar turbulence in the southern sky seen through spatial gradients of the polarization vector
• Alfvenic Turbulence Beyond the Ambipolar Diffusion Scale
• Interstellar Sonic and Alfvénic Mach Numbers and the Tsallis Distribution
• The Multi-phase Turbulence Density Power Spectra in the Perseus Molecular Cloud
• Topology of Neutral Hydrogen Within the Small Magellanic Cloud
• Study of velocity centroids based on the theory of fluctuations in position-position-velocity space
• Synthetic observations of star formation and the interstellar medium
• A Statistical Investigation of HI in the Magellanic Bridge
• Exponential Tails in the Centroid Velocity Distributions of Star-Forming Regions
• The HI Probability Distribution Function and the Atomic-to-Molecular Transition in Molecular Clouds
• Interstellar cloud structure: The statistics of centroid velocities
• Effect of the heating rate on the stability of the three-phase interstellar medium
• Structure analysis of interstellar clouds: II. Applying the Delta-variance method to interstellar turbulence
• The Effects of Noise and Sampling on the Spectral Correlation Function
• The Effects of Radiative Transfer on the PDFs of Molecular MHD Turbulence
• Principal Component Analysis of Spectral Line Data: Analytic Formulation
• Developing the 3-Point Correlation Function For the Turbulent Interstellar Medium
• Anisotropies in the HI gas distribution toward 3C196
• Structural Variation of Molecular Gas in the Sagittarius Arm and Inter-Arm Regions
• Identifying Tools for Comparing Simulations and Observations of Spectral-line Data Cubes
• Astrochemical Correlations in Molecular Clouds
• An Exploration of the Statistical Signatures of Stellar Feedback
• The Phase Coherence of Interstellar Density Fluctuations
• Advanced Diagnostics for the Study of Linearly Polarized Emission. II: Application to Diffuse Interstellar Radio Synchrotron Emission
• Observational Diagnostics for Two-Fluid Turbulence in Molecular Clouds As Suggested by Simulations
• Wavelet-based cross-correlation analysis of structure scaling in turbulent clouds
• Principal Component Analysis studies of turbulence in optically thick gas
• Comparing Simulated Emission from Molecular Clouds Using Experimental Design
• Assessing the Impact of Astrochemistry on Molecular Cloud Turbulence Statistics
• Effects of the magnetic field direction on the Tsallis statistic

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