The Launching of Cold Clouds by Galaxy Outflows III: The Influence of Magnetic Fields

Abstract

Motivated by observations of outflowing galaxies, we investigate the combined impact of magnetic fields and radiative cooling on the evolution of cold clouds embedded in a hot wind. We perform a collection of three-dimensional adaptive mesh refinement, magnetohydrodynamical simulations that span two resolutions, and include fields that are aligned and transverse to the oncoming, super-Alfvénic material. Aligned fields have little impact on the overall lifetime of the clouds over the non-magnetized case, although they do increase the mixing between the wind and cloud material by a factor of $\approx 3.$ Transverse fields lead to magnetic draping, which isolates the clouds, but they also squeeze material in the direction perpendicular to the field lines, which leads to rapid mass loss. A resolution study suggests that the magnetized simulations have somewhat better convergence properties than non-magnetized simulations, and that a resolution of 64 zones per cloud radius is sufficient to accurately describe these interactions. We conclude that the combined effects of radiative cooling and magnetic fields are dependent on field orientation, but are unlikely to enhance cloud lifetimes beyond the effect of radiative cooling alone.

15 pages, 14 figures, accepted to ApJ

References in corpus (19)

• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Massive molecular outflows and negative feedback in ULIRGs observed by Herschel-PACS
• Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
• Magnetized Gas Clouds can Survive Acceleration by a Hot Wind
• Giant Magnetized Outflows from the Centre of the Milky Way
• The Launching of Cold Clouds by Galaxy Outflows I: Hydrodynamic Interactions with Radiative Cooling
• On the interplay between star formation and feedback in galaxy formation simulations
• A robust numerical scheme for highly compressible magnetohydrodynamics: Nonlinear stability, implementation and tests
• Hydrodynamical Coupling of Mass and Momentum in Multiphase Galactic Winds
• The importance of magnetic-field-oriented thermal conduction in the interaction of SNR shocks with interstellar clouds
• The Magnetohydrodynamics of Shock-Cloud Interaction in Three Dimensions
• New Perspective on Galaxy Outflows From the First Detection of Both Intrinsic and Traverse Metal-Line Absorption
• The turbulent destruction of clouds - I. A k-epsilon treatment of turbulence in 2D models of adiabatic shock-cloud interactions
• Filament formation in wind-cloud interactions. II. Clouds with turbulent density, velocity, and magnetic fields
• On the dynamics and survival of fractal clouds in galactic winds
• The Production of Cold Gas Within Galaxy Outflows
• Shock-triggered formation of magnetically-dominated clouds
• M82 - A radio continuum and polarisation study II. Polarisation and rotation measures
• Magnetized High Velocity Clouds in the Galactic Halo: A New Distance Constraint

Cited by in corpus (31)

• Resolving small-scale cold circumgalactic gas in TNG50
• The Structure of Multiphase Galactic Winds
• Interaction of a cold cloud with a hot wind: the regimes of cloud growth and destruction and the impact of magnetic fields
• Survival and mass growth of cold gas in a turbulent, multiphase medium
• Growth and structure of multiphase gas in the cloud-crushing problem with cooling
• It's Cloud's Illusions I Recall: Mixing Drives the Acceleration of Clouds from Ram Pressure Stripped Galaxies
• The Survival of Multiphase Dusty Clouds in Hot Winds
• Shock-multicloud interactions in galactic outflows -- II. Radiative fractal clouds and cold gas thermodynamics
• The Launching of Cold Clouds by Galaxy Outflows. IV. Cosmic-Ray-Driven Acceleration
• GASP XXXVIII: The LOFAR-MeerKAT-VLA view on the non-thermal side of a jellyfish galaxy
• Shock-multicloud interactions in galactic outflows -- I. Cloud layers with log-normal density distributions
• The in situ formation of molecular and warm ionised gas triggered by hot outflows
• A New Model For Including Galactic Winds in Simulations of Galaxy Formation I: Introducing the Physically Evolved Winds (PhEW) Model
• Structure and kinematics of shocked gas in Sgr B2: further evidence of a cloud-cloud collision from SiO emission maps
• CR Driven Multi-phase Gas Formed via Thermal Instability
• Better Together: The Complex Interplay Between Radiative Cooling and Magnetic Draping
• Walk on the Low Side: LOFAR explores the low-frequency radio emission of GASP jellyfish galaxies
• The Launching of Cold Clouds by Galaxy Outflows V: The Role of Anisotropic Thermal Conduction
• The observable properties of cool winds from galaxies, AGN, and star clusters -- II. 3D models for the multiphase wind of M82
• Turbulence in the Tail of a Jellyfish Galaxy
• Magnetic field draping around clumpy high-velocity clouds in galactic halo
• The role of the halo magnetic field on accretion through High-Velocity Clouds
• Jet-Feedback on kpc scales: a review
• Simulations of Weakly Magnetized Turbulent Mixing Layers
• Zooming in on the Circumgalactic Medium with GIBLE: Tracing the Origin and Evolution of Cold Clouds
• Modeling Photoionized Turbulent Material in the Circumgalactic Medium III: Effects of Co-rotation and Magnetic Fields
• Not gone with the Wind: Survival of High-Velocity Molecular Clouds in the Galactic center
• IllustrisTNG + Cosmic Rays with a Simple Transport Model: From Dwarfs to L${}^{\star }$ Galaxies
• The imprint of magnetic fields on absorption spectra from circumgalactic wind-cloud systems
• A New Model For Including Galactic Winds in Simulations of Galaxy Formation II: Implementation of PhEW in Cosmological Simulations
• Modeling Multiphase Galactic Outflows: A Multifluid Moving Mesh Approach