Magnetic Sunyaev-Zel'dovich effect in galaxy clusters

Abstract

This Letter explores influences of intracluster magnetic fields ($\gsim 1μ$G) submerged in the hot electron gas on classic Sunyaev-Zel'dovich effect (SZE) and thermal bremsstrahlung in X-ray emissions. As the Larmor frequency is much higher than all collision frequencies, the presence of magnetic field may lead to an anisotropic velocity distribution of hot electrons. For the two-temperature relativistic Maxwell-Boltzmann distribution, we compute modifications to the classical thermal SZE. Intracluster magnetic fields tend to enhance the SZE with steeper radial variations, which bear important consequences for cluster-based estimates of cosmological parameters. By applying the magnetic SZE theory to spectral observations of SZ and Chandra X-ray emissions from the galaxy cluster Abell 2163, a $\sim 30-40\mu$G central core magnetic field $B_0$ is predicted. For the SZ and Chandra X-ray spectral observations of the Coma cluster, our theoretical analysis is also consistent with an observationally inferred $B_0\lsim 10μ$G. As the magnetic SZE is redshift $z$ independent, this mechanism might offer a potentially important and unique way of probing intracluster magnetic fields in the expanding universe.

4 pages, 3 figures. submitted to ApJL

References in corpus (23)

• Cosmology with the Sunyaev-Zel'dovich Effect
• The Sunyaev-Zel'dovich Effect
• Cluster Magnetic Fields
• A New Radio - X-Ray Probe of Galaxy Cluster Magnetic Fields
• Chandra estimate of the magnetic field strength near the cold front in A3667
• XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region
• The giant radio halo in Abell 2163
• Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters
• Magnetic fields in cluster cores: Faraday rotation in A400 and A2634
• Merger shocks in galaxy clusters A665 and A2163 and their relation to radio halos
• Magnetic fields in the Centaurus cluster
• The Non-Thermal Sunyaev-Zel'dovich Effect in Clusters of Galaxies
• ABELL 2163: Temperature, Mass, and Hydrostatic Equilibrium
• Measurement of the Hubble Constant from X-ray and 2.1 mm Observations of Abell 2163
• Stochastic Acceleration and Non-Thermal Radiation in Clusters of Galaxies
• MITO measurements of the Sunyaev-Zeldovich Effect in the Coma cluster of galaxies
• Kinetic Sunyaev-Zel'dovich effect from halo rotation
• Kinetic Sunyaev-Zeldovich effect from galaxy cluster rotation
• Observations of the Sunyaev-Zel'dovich effect at high angular resolution towards the galaxy clusters A665, A2163 and CL0016+16
• On cooling flows and the Sunyaev-Zel'dovich effect
• The influence of magnetic fields on the Sunyaev Zel'dovich effect in clusters of galaxies
• The effect of cluster magnetic field on the Sunyaev Zeldovich power spectrum
• Cooling flow bulk motion corrections to the Sunyaev Zel'dovich effect

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• Self-Similar Shocks and Winds in Galaxy Clusters
• Scale-Free Thin Discs with an Isopedic Magnetic Field
• Impact of magnetic field on the gas mass fraction of galaxy clusters