Home Newsletter
News Books
Welcome to FreeScience.info Language/Lingua

Books 3054
· Book News
· Most clicked
· Least clicked

Search for a Book
Add a new Book

The Astrophysics of the Intracluster Plasma

Author: A. Cavaliere , A. Lapi
Url: http://arxiv.org/abs/1308.6673
Format: Ps, Pdf
Year: 2013
Category: Cosmology
Pages: 62
Clicks: 682

[Abridged] Since 1971 observations in X rays of thousands galaxy clusters have uncovered huge amounts of hot baryons filling up the deep gravitational potential wells provided by dark matter (DM) halos with sizes of millions light-years and masses of some 10^15 M_sun. At temperatures T~10^8 K and with average densities of n~1 particle per liter, such baryons add up to some 10^14 M_sun. With the neutralizing electrons, they constitute the best proton-electron plasma in the Universe (Intra Cluster Plasma, ICP). A key physical feature of the ICP is constituted by its good local Thermal equilibrium, and by its overall hydrostatic condition in the DM wells, modulated by entropy. The latter is set up in the cluster center by the initial halo collapse, and is progressively added at the outgrowing cluster boundary by standing shocks in the supersonic flow of intergalactic gas into the DM wells. We review these entropy-based models and discuss their outcomes and predictions concerning the ICP observables in X rays and in microwaves. The results provide a baseline for disentangling a number of additional and intriguing physical processes superposed to the general equilibrium. We cover: the central entropy erosion produced by radiative cooling vs. the intermittent energy inputs mainly due to active galactic nuclei and mergers; outer turbulent support linked with weakening shocks and decreasing inflow through the virial boundary, causing reduced entropy production; the development from high to low entropy levels throughout a typical cluster; perturbations of the equilibrium up to outright disruption due to deep impacts of infalling galaxy groups or collisions with comparable companion clusters; relativistic energy distributions of electrons accelerated during such events, producing extended radio emission by synchrotron radiation, and contributing to non-thermal pressure support for the ICP.

Similar Books
Superstring Cosmology
Numerical Simulations in Cosmology I
Cosmology from Topological Defects
TASI Lectures: Introduction to Cosmology
Introduction to relativistic astrophysics and cosmology
Introduction to cosmology
Particle Physics and Inflationary Cosmology
Advanced Topics in Cosmology: A Pedagogical Introductio
Introduction to relativistic astrophysics and cosmology through
An introduction to quantum cosmology
Ekpyrotic and Cyclic Cosmology
Cosmology for Particle Physicists
Dwarf-Galaxy Cosmology
Particle Physics Aspects of Modern Cosmology
Introduction to Cosmology
A practical guide to Basic Statistical Techniques for Data Analysis in Cosmology
Supernova cosmology: legacy and future
Primordial magnetogenesis
Introduction to Early Universe Cosmology
Relativité et Cosmologie
Cosmology and Structure Formation
Advances in Modern Cosmology
Tides in colliding galaxies
Observational Probes of Cosmic Acceleration
Saas-Fee Lecture Notes: Multi-messenger Astronomy and Dark Matter
Preludes to dark energy: Zero-point energy and vacuum speculations
Large Scale Structure of the Universe
A Review of the Universe - Structures, Evolutions, Observations, and Theories
This text aims to give a pedagogical introduction into the main concepts of the theory of structure formation in the univers
Lectures On Galois Cohomology of ClassicalGroups
Cosmology Primer
Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
Dark Energy: Observational Evidence and Theoretical Models

Home |  Authors | About | Contact Us |  Email 
 Copyright © 2002-2013 FreeScience.info. 

Best viewed with Mozilla 1.X 1024x768
free scientific books