Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings

Details Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings

2005-01-26

arxiv.org/abs/astro-ph/0501575v1

Adv.Space Res. 36 (2005) 738-746

Astronomy and Astrophysics

Astrophysics

19 pages, Invited talk at COSPAR Symposium "Clusters of Galaxies: New Insights from XMM-Newton, Chandra and INTEGRAL", Paris (

Scientific paper

10.1016/j.asr.2005.01.052

The nonthermal phenomena in clusters of galaxies are considered in the context of the hierarchical model of cosmic structure formation by accretion and merging of the dark matter (DM) substructures.Accretion and merging processes produce large-scale gas shocks. The plasma shocks are expected to be collisionless. In the course of cluster's aggregation, the shocks, being the main gas-heating agent, generate turbulent magnetic fields and accelerate energetic particles via collisionless multi-fluid plasma relaxation processes. The intracluster gas heating and entropy production rate by a collisionless shock may differ significantly from that in a single-fluid collisional shock. Simple scaling relations for postshock ion temperature and entropy as functions of shock velocity in strong collisionless multi-fluid shocks are presented. We show that the multi-fluid nature of the collisionless shocks results in high gas compression, reduced entropy production and modified sigma_v-T, M-T and L_x-T scalings. The scaling indexes estimated for a simple model of a strong accretion multi-fluid shock are generally consistent with observations. Soft X-ray and extreme ultraviolet photons dominate the emission of strong accretion shock precursors that appear as large-scale filaments. Magnetic fields, turbulence and energetic particles constitute the nonthermal components contributing into the pressure balance, energy transport and emission of clusters. Nonthermal emission of energetic particles could be a test to constrain the cluster properties.

Affiliated with

Also associated with

No associations

Rating

Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-fluid shocks in clusters of galaxies: entropy, sigma_ v-T, M-T and L_x-T scalings will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-627169