Effects of Magnetic Fields on Gas Dynamics and Star Formation in Nuclear Rings

Abstract

Nuclear rings at the centers of barred galaxies are known to be strongly magnetized. To explore the effects of magnetic fields on star formation in these rings and nuclear gas flows, we run magnetohydrodynamic simulations in which there is a temporally-constant magnetized inflow to the ring, representing a bar-driven inflow. The mass inflow rate is $1M_{\odot }{\mathrm{yr}}^{-1}$, and we explore models with a range of field strength in the inflow. We adopt the TIGRESS framework developed by Kim & Ostriker to handle radiative heating and cooling, star formation, and resulting supernova (SN) feedback. We find that magnetic fields are efficiently amplified in the ring due to rotational shear and SN feedback. Within a few $100\mathrm{Myr}$, the turbulent component $B_{\mathrm{trb}}$ in the ring saturates at $\sim 35\mu \mathrm{G}$ (in rough equipartition with the turbulent kinetic energy density), while the regular component $B_{\mathrm{reg}}$ exceeds $50\mu \mathrm{G}$. Expanding superbubbles created by clustered SN explosions vertically drag predominantly-toroidal fields from near the midplane to produce poloidal fields in high-altitude regions. The growth of magnetic fields greatly suppresses star formation at late times. Simultaneously, strong magnetic tension in the ring drives radially inward accretion flows from the ring to form a circumnuclear disk in the central region; this feature is absent in the unmagnetized model.

arXiv comment29 pages, 17 figures, accepted for publication in ApJ

References in corpus (68)

• Astrophysical magnetic fields and nonlinear dynamo theory
• Athena: A New Code for Astrophysical MHD
• The Nuclear Bulge of the Galaxy. III. Large-Scale Physical Characteristics of Stars and Interstellar Matter
• Magnetic Fields in Spiral Galaxies
• Regulation of Star Formation Rates in Multiphase Galactic Disks: a Thermal/Dynamical Equilibrium Model
• Momentum Injection by Supernovae in the Interstellar Medium
• An Origin of Supersonic Motions in Interstellar Clouds
• Maximally Star-Forming Galactic Disks I. Starburst Regulation Via Feedback-Driven Turbulence
• H3+ in Diffuse Interstellar Clouds: a Tracer for the Cosmic-Ray Ionization Rate
• Three-phase Interstellar medium in Galaxies Resolving Evolution with Star formation and Supernova feedback (TIGRESS): Algorithms, Fiducial model, and Convergence
• AINUR: Atlas of Images of NUclear Rings
• Magnetic Fields in High-Mass Infrared Dark Clouds
• Magnetic field formation in the Milky Way-like disk galaxies of the Auriga project
• ALMA observations of molecular tori around massive black holes
• The cosmic ray ionization rate in the Galactic disk, as determined from observations of molecular ions
• Direct simulations of a supernova-driven galactic dynamo
• Magnetic fields in barred galaxies. IV. NGC 1097 and NGC 1365
• Galactic dynamo and helicity losses through fountain flow
• Amplification, Saturation, and Q Thresholds for Runaway: Growth of Self-Gravitating Structures in Models of Magnetized Galactic Gas Disks
• The 1.28 GHz MeerKAT Galactic Center Mosaic
• Three-Dimensional Simulations of Parker, Magneto-Jeans, and Swing Instabilities in Shearing Galactic Gas Disks
• Nuclear spirals in galaxies: gas response to asymmetric potential. II. Hydrodynamical models
• Time Inference with MUSE in Extragalactic Rings (TIMER): Properties of the Survey and High-Level Data Products
• Doubly Helical Coronal Ejections from Dynamos and their Role in Sustaining the Solar Cycle
• Early formation and recent starburst activity in the nuclear disc of the Milky Way
• Star Formation Efficiency and Dispersal of Giant Molecular Clouds with UV Radiation Feedback: Dependence on Gravitational Boundedness and Magnetic Fields
• Vertical Equilibrium, Energetics, and Star Formation Rates in Magnetized Galactic Disks Regulated by Momentum Feedback from Supernovae
• Formation of Magnetized Prestellar Cores with Ambipolar Diffusion and Turbulence
• A Simple and Accurate Network for Hydrogen and Carbon Chemistry in the ISM
• Simulations of the Milky Way's central molecular zone -- I. Gas dynamics
• The Mass Inflow Rate in the Barred Galaxy NGC 1530
• Pressure-Regulated, Feedback-Modulated Star Formation In Disk Galaxies
• A small-scale dynamo in feedback-dominated galaxies as the origin of cosmic magnetic fields - I. The kinematic phase
• Cosmic-ray and X-ray Heating of Interstellar Clouds and Protoplanetary Disks
• Kinematic signatures of nuclear discs and bar-driven secular evolution in nearby galaxies of the MUSE TIMER project
• The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728
• Models of Vertically Stratified Two-Phase ISM Disks with MRI-Driven Turbulence
• Numerical Simulations of Turbulent Molecular Clouds Regulated by Reprocessed Radiation Feedback from Nascent Super Star Clusters
• A Connection between Star Formation in Nuclear Rings and their Host Galaxies
• Simulations of the Milky Way's central molecular zone -- II. Star formation
• Dissipation and Heating in Supersonic Hydrodynamic and MHD Turbulence
• Mass inflow rate into the Central Molecular Zone: observational determination and evidence of episodic accretion
• The Star Formation History and Evolution of the Circumnuclear Region of M100
• The Life Cycle of the Central Molecular Zone. I: Inflow, Star Formation, and Winds
• The inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey
• Effects of Gas on Formation and Evolution of Stellar Bars and Nuclear Rings in Disk Galaxies
• Star formation and stellar populations across nuclear rings in galaxies
• A small-scale dynamo in feedback-dominated galaxies - II. The saturation phase and the final magnetic configuration
• Local Simulations of Spiral Galaxies with the TIGRESS Framework: I. Star Formation and Arm Spurs/Feathers
• Modeling UV Radiation Feedback from Massive Stars: I. Implementation of Adaptive Ray Tracing Method and Tests
• A Measurement of the Black-Hole Mass in NGC 1097 using ALMA
• Galactic Spiral Shocks with Thermal Instability
• Ab initio Simulations of a Supernova Driven Galactic Dynamo in an Isolated Disk Galaxy
• Massive Clusters in the Inner Regions of NGC 1365: Cluster Formation and Gas Dynamics in Galactic Bars
• Nuclear Bar Catalyzed Star Formation: 13^CO, C18^O and Molecular Gas Properties in the Nucleus of Maffei 2
• Magnetic Field Configuration at the Galactic Center Investigated by Wide Field Near-Infrared Polarimetry: Transition from a Toroidal to a Poloidal Magnetic Field
• Discovery of massive star formation quenching by nonthermal effects in the center of NGC 1097
• Small-Scale Dynamo in Supernova-Driven Interstellar Turbulence
• From kpcs to the central parsec of NGC 1097: feeding star formation and a black hole at the same time
• Extragalactic magnetism with SOFIA (Legacy Program) -- II: A magnetically-driven flow in the starburst ring of NGC 1097
• Star Formation in Nuclear Rings with the TIGRESS Framework
• Nuclear Spiral Shocks and Induced Gas Inflows in Weak Oval Potentials
• On the nature of radio filaments near the Galactic Center
• Connections between star cluster populations and their host galaxy nuclear rings
• Effects of Varying Mass Inflows on Star Formation in Nuclear Rings of Barred Galaxies
• NGC 4314. III. Inflowing Molecular Gas Feeding a Nuclear Ring of Star Formation
• CHANG-ES. XXIV. First Detection of A Radio Nuclear Ring and Potential LLAGN in NGC 5792
• Supernova-remnant origin of the Galactic-Centre filaments

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