Stability of cold fronts in clusters: is magnetic field necessary?
arXiv:astro-ph/0403440 · doi:10.1111/j.1365-2966.2004.07858.x
Abstract
Cold fronts - sharp discontinuities recently discovered by Chandra in many clusters of galaxies - are believed to be due to a hot gas flow over a colder gravitationally bound gas cloud. We analyze the stability of the fronts with respect to Kelvin-Helmholtz instability and show that an intrinsic width of the interface of the order of a few per cent of the curvature radius strongly limits the growth of perturbation. For the best studied case of a front in the Cluster Abell 3667 we conclude that current observational data on the width and extent of the front can be explained even in the absence of dynamically important magnetic fields.
arXiv comment5 pages, 3 figures, MNRAS (accepted), minor typos corrected
References in corpus (9)
- Chandra Observation of Abell 2142: Survival of Dense Subcluster Cores in a Merger
- A moving cold front in the intergalactic medium of A3667
- Chandra estimate of the magnetic field strength near the cold front in A3667
- Chandra observtaion of A2256 - a cluster at the early stage of merging
- Chandra Observations of Abell 85: Merger of the South Subcluster
- Ram pressure stripping and the formation of cold fronts
- Cold Fronts in CDM clusters
- A Cold Front in A3667: Hydrodynamics and Magnetic Field in the Intracluster Medium
- A Cold Front in a Preheated Galaxy Cluster
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- A High Fidelity Sample of Cold Front Clusters from the Chandra Archive
- Shock fronts, electron-ion equilibration and ICM transport processes in the merging cluster Abell 2146
- The momentum budget of clustered supernova feedback in a 3D, magnetised medium
- Cold Fronts and Gas Sloshing in Galaxy Clusters with Anisotropic Thermal Conduction
- Cold Fronts: Probes of Plasma Astrophysics in Galaxy Clusters
- Impact of magnetic fields on ram pressure stripping in disk galaxies
- Kelvin-Helmholtz instabilities at the sloshing cold fronts in the Virgo cluster as a measure for the effective ICM viscosity
- Substructure in the cold front cluster Abell 3667
- Deep Chandra observations of NGC 1404: cluster plasma physics revealed by an infalling early-type galaxy
- Viscous Kelvin-Helmholtz instabilities in highly ionised plasmas
- Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky
- An azimuthally resolved study of the cold front in Abell 3667
- On the Rayleigh-Taylor Instability of Radio Bubbles in Galaxy Clusters
- On the Kelvin-Helmholtz instability with smooth initial conditions -- Linear theory and simulations
- Irregular sloshing cold fronts in the nearby merging groups NGC 7618 and UGC 12491: evidence for Kelvin-Helmholtz instabilities
- On the width of cold fronts in clusters of galaxies due to conduction
- Suppression of local heat flux in a turbulent magnetized intracluster medium
- How Much Can We Learn From A Merging Cold Front Cluster? : Insights From X-ray Temperature and Radio Maps of Abell 3667
- Turbulent magnetic fields in merging clusters: A case study of Abell 2146
- North Polar Spur: gaseous plume(s) from star-forming regions at 3-5 kpc from Galactic Center?
- Polarization of Sunyaev-Zeldovich signal due to electron pressure anisotropy in galaxy clusters
- The relationship between warm and hot gas-phase metallicity in massive elliptical galaxies and the influence of AGN feedback