Turbulence in a self-gravitating molecular cloud core
arXiv:2001.07721 · doi:10.3847/1538-4357/ab6e63
Abstract
Externally driven interstellar turbulence plays an important role in shaping the density structure in molecular clouds. Here we study the dynamical role of internally driven turbulence in a self-gravitating molecular cloud core. Depending on the initial conditions and evolutionary stages, we find that a self-gravitating core in the presence of gravity-driven turbulence can undergo constant, decelerated, and accelerated infall, and thus has various radial velocity profiles. In the gravity-dominated central region, a higher level of turbulence results in a lower infall velocity, a higher density, and a lower mass accretion rate. As an important implication of this study, efficient reconnection diffusion of magnetic fields against the gravitational drag naturally occurs due to the gravity-driven turbulence, without invoking externally driven turbulence.
8 pages, 5 figures, accepted for publication in ApJ
References in corpus (48)
- Theory of Star Formation
- Astrophysical magnetic fields and nonlinear dynamo theory
- Reconnection in a Weakly Stochastic Field
- Comparing the statistics of interstellar turbulence in simulations and observations: Solenoidal versus compressive turbulence forcing
- The Star Formation Rate of Turbulent Magnetized Clouds: Comparing Theory, Simulations, and Observations
- Numerical Tests of Fast Reconnection in Weakly Stochastic Magnetic Fields
- Interstellar Turbulence II: Implications and Effects
- The Turbulent Shock Origin of Proto--Stellar Cores
- Dense Gas and Star Formation: Characteristics of Cloud Cores Associated with Water Masers
- Extending Big Power Law in the Sky with Turbulence Spectra from WHAM data
- The outer scale of turbulence in the magneto-ionized Galactic interstellar medium
- 3D Turbulent Reconnection: Theory, Tests and Astrophysical Implications
- Density Studies of MHD Interstellar Turbulence: Statistical Moments, Correlations and Bispectrum
- The generation of strong magnetic fields during the formation of the first stars
- Low-Mach-number turbulence in interstellar gas revealed by radio polarization gradients
- The role of turbulent magnetic reconnection on the formation of rotationally supported protostellar disks
- Adiabatic Heating of Contracting Turbulent Fluids
- Velocity Spectrum for HI at High Latitudes
- Statistical Description of Synchrotron Intensity Fluctuations: Studies of Astrophysical Magnetic Turbulence
- Cosmic Ray Parallel and Perpendicular Transport in Turbulent Magnetic Fields
- Diffusion of magnetic field and removal of magnetic flux from clouds via turbulent reconnection
- Moving mesh simulations of star forming cores in magneto-gravo-turbulence
- Star Formation in Self-Gravitating Turbulent Fluids
- Magnetization of cloud cores and envelopes and other observational consequences of reconnection diffusion
- Magnetized Interstellar Molecular Clouds. I. Comparison Between Simulations and Zeeman Observations
- Testing Larson's relationships in massive clumps
- Spectrum and Anisotropy of Turbulence from Multi-Frequency Measurement of Synchrotron Polarization
- Turbulent dynamo in a conducting fluid and partially ionized gas
- On the formation of density filaments in the turbulent interstellar medium
- Damping of MHD turbulence in partially ionized plasma: implications for cosmic ray propagation
- Generalized Collapse Solutions with Nonzero Initial Velocities for Star Formation in Molecular Cloud Cores
- Testing the Reality of Strong Magnetic Fields on T Tauri Stars: The Naked T Tauri Star Hubble 4
- Time Varying Dynamical Star Formation Rate
- Massive 70 micron quiet clumps II: non-thermal motions driven by gravity in massive star formation?
- Scatter broadening of pulsars and implications on the interstellar medium turbulence
- Disc formation in turbulent cloud cores: is magnetic flux loss necessary to stop the magnetic braking catastrophe or not?
- Effect of Angular Momentum Alignment and Strong Magnetic Fields on the Formation of Protostellar Disks
- Envelope Expansion with Core Collapse. I. Spherical Isothermal Similarity Solutions
- Interpretation of the structure function of rotation measure in the interstellar medium
- Star formation from dense shocked regions in supersonic isothermal magneto-turbulence
- Resonance-broadened transit time damping of particles in MHD turbulence
- Multi-scale dynamics in star-forming regions: the interplay between gravity and turbulence
- Magnetic field amplification in supernova remnants
- Collapse of Turbulent Cores and Reconnection Diffusion
- Studies of Turbulence Dissipation in Taurus Molecular Cloud with Core Velocity Dispersion (CVD)
- Dense Regions in Supersonic Isothermal Turbulence
- Magnetic fields in early protostellar disk formation
- Turbulent dynamo in a weakly ionized medium
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- The Velocity Statistics of Turbulent Clouds in the Presence of Gravity, Magnetic fields, Radiation, and Outflow Feedback
- Direct collapse of exceptionally heavy black holes in the merger-driven scenario
- Nonlinear turbulent dynamo during gravitational collapse
- The evolution of temperature and density structures of OB cluster-forming molecular clumps
- Non-adiabatic turbulence driving during gravitational collapse
- Physical and chemical structure of the Serpens filament -- fast formation and gravity-driven accretion
- Wide binary stars formed in the turbulent interstellar medium
- Evolution of the angular momentum during gravitational fragmentation of molecular clouds
- The evolution of the internal structure of massive star forming regions in the Milky Way as revealed by ALMA
- Reconciling extragalactic star formation efficiencies with theory: insights from PHANGS
- Turbulence and its connection to episodic accretion in binary YSOs
- Length-scales and Dynamics of Carina's Western Wall
- Density profile of a self-gravitating polytropic turbulent fluid in a rotating disk near to the cloud core
- The ablation of gas clouds by blazar jets
- Density profile of a self-gravitating polytropic turbulent fluid in the context of ensembles of molecular clouds
- Amplification and generation of turbulence during self-gravitating collapse