Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-22
JCAP 0703:001,2007
Astronomy and Astrophysics
Astrophysics
5 pages, 1 figure
Scientific paper
10.1088/1475-7516/2007/03/001
A fraction of the thermal protons in the outer envelope of an X-ray cluster have velocities that exceed the local escape speed from the cluster gravitational potential. The Coulomb mean-free-path of these protons is larger than the virial radius of the cluster at temperatures >2.5 keV. The resulting leakage of suprathermal particles generates a collisionless shock in neighboring voids and fills them with heat and magnetic fields. The momentum flux of suprathermal particles cannot be confined by magnetic tension at the typical field strength in the periphery of cluster halos (<<1 micro-gauss). Over a Hubble time, thermal evaporation could drain up to a tenth of the cluster gas at its virial temperature. The evaporated fraction could increase dramatically if additional heat is deposited into the gas by cluster mergers, active galactic nuclei or supernovae. Thermal evaporation is not included in existing cosmological simulations since they are based on the fluid approximation. Measurements of the baryon mass fraction in the outer envelopes of hot clusters (through their Sunyaev-Zel'dovich effect or X-ray emission) can be used to empirically constrain their evaporation rate.
No associations
LandOfFree
Thermal Evaporation of Gas from X-ray Clusters 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 Thermal Evaporation of Gas from X-ray Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal Evaporation of Gas from X-ray Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-528470