Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-09-27
Astrophys.J. 477 (1997) 560
Astronomy and Astrophysics
Astrophysics
Accepted by ApJ, 16 pages, LaTeX, 2 figures, epsfig.sty, aaspp4.sty
Scientific paper
10.1086/303722
The masses of clusters of galaxies estimated by gravitational lensing exceed in many cases the mass estimates based on hydrostatic equilibrium. This may suggest the existence of nonthermal pressure. We ask if radio galaxies can heat and support the cluster gas with injected cosmic ray protons and magnetic field densities, which are permitted by Faraday rotation and gamma ray observations of clusters of galaxies. We conclude that they are powerful enough to do this within a cluster radius of roughly 1 Mpc. If present, nonthermal pressures could lead to a revised estimate of the ratio of baryonic mass to total mass, and the apparent baryonic overdensity in clusters would disappear. In consequence, $\Omega_{\rm cold}$, the clumping part of the cosmological density $\Omega_{o}$, would be larger than $0.4\,h_{50}^{-1/2}$.
Biermann Peter L.
Ensslin Torsten A.
Kronberg Philipp P.
Wu Xiang-Ping
No associations
LandOfFree
Cosmic Ray Protons and Magnetic Fields in Clusters of Galaxies and their Cosmological Consequences 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 Cosmic Ray Protons and Magnetic Fields in Clusters of Galaxies and their Cosmological Consequences, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic Ray Protons and Magnetic Fields in Clusters of Galaxies and their Cosmological Consequences will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-245420