The role of magnetic fields in ram pressure stripping of satellite galaxies in the circumgalactic medium around massive galaxies

Abstract

The presence of magnetic fields in galaxies and their haloes could have important consequences for satellite galaxies moving through the magnetised circumgalactic medium (CGM) of their host. We therefore study the effect of magnetic fields on ram pressure stripping of satellites in the CGM of massive galaxies. We use cosmological `zoom-in' simulations of three massive galaxy haloes ($M_{200c}=10^{12.5-13}$ M${}_{\odot }$), each simulated with and without magnetic fields. Across our full sample of satellite galaxies (11 with magnetic fields and 10 without), we find that the fraction of gas retained after infall through the CGM shows no population-wide impact of magnetic fields. However, for the most massive satellites, we find that twice as much gas is stripped without magnetic fields. The evolution of a galaxy's stripped tail is also strongly affected. Magnetic fields reduce turbulent mixing, inhibiting the dispersion of metals into the host CGM. This suppressed mixing greatly reduces condensation from the CGM onto the stripped tail. By studying the magnetic field structure, we find evidence of magnetic draping and attribute differences in the stripping rate to the draping layer. Differences in CGM condensation are attributed to magnetic field lines aligned with the tail suppressing turbulent mixing. We simulate one halo with enhanced resolution in the CGM and show these results are converged with resolution, though the structure of the cool gas in the tail is not. Our results show that magnetic fields can play an important role in ram pressure stripping in galaxy haloes and should be included in simulations of galaxy formation.

14 pages, 9 figures, accepted for publication by MNRAS

References in corpus (25)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The Circumgalactic Medium
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
• Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
• Hydrodynamical simulations of the galaxy population: enduring successes and outstanding challenges
• Interaction of a cold cloud with a hot wind: the regimes of cloud growth and destruction and the impact of magnetic fields
• Evidence for a Massive, Extended Circumgalactic Medium Around the Andromeda Galaxy
• Gas accretion and galactic fountain flows in the Auriga cosmological simulations: angular momentum and metal re-distribution
• The effect of magnetic fields on properties of the circumgalactic medium
• Determining the full satellite population of a Milky Way-mass halo in a highly resolved cosmological hydrodynamic simulation
• The environmental dependence of gas accretion onto galaxies: quenching satellites through starvation
• The eROSITA Final Equatorial Depth Survey (eFEDS): X-ray emission around star-forming and quiescent galaxies at $0.05<z<0.3$
• The Journey Counts: The Importance of Including Orbits when Simulating Ram Pressure Stripping
• Highly ordered magnetic fields in the tail of the jellyfish galaxy JO206
• Magnetogenesis around the first galaxies: the impact of different field seeding processes on galaxy formation
• Jellyfish galaxies with the IllustrisTNG simulations -- When, where, and for how long does ram pressure stripping of cold gas occur?
• The impact of magnetic fields on cosmological galaxy mergers. I: Reshaping gas and stellar discs
• Quenching Timescales in the IllustrisTNG Simulation
• The hot circumgalactic media of massive cluster satellites in the TNG-Cluster simulation: existence and detectability
• Detection of the diffuse HI emission in the Circumgalactic Medium of NGC 891 and NGC 4565
• The magnetised and thermally unstable tails of jellyfish galaxies
• Ram pressure stripping in clusters: Gravity can bind the ISM but not the CGM
• Cooling rate and turbulence in the intracluster medium of the cool-core cluster Abell 2667
• Environment matters: stronger magnetic fields in satellite galaxies

Cited by in corpus (1)

• The supersonic nature of jellyfish galaxies