Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-24
Astrophys.J.660:1137-1145,2007
Astronomy and Astrophysics
Astrophysics
16 pages, 10 figures, accepted by ApJ
Scientific paper
10.1086/513691
We describe how AGN-produced cosmic rays form large X-ray cavities and radio lobes in the hot diffuse gas in galaxy groups and clusters. Cosmic rays are assumed to be produced in a small shocked region near the cavity center, such as at the working surface of a radio jet. The coupled equations for gasdynamics and cosmic ray diffusion are solved with various assumptions about the diffusion coefficient. To form large, long-lived cavities similar to those observed, the diffusion coefficient must not exceed kappa = 10^28 cm^2/s in the hot gas, very similar to values required in models of cosmic ray diffusion in the Milky Way. When kappa does not exceed 10^28, cosmic rays are confined within the cavities for times comparable to the cavity buoyancy time, as implied by observations of X-ray cavities and their radio synchrotron emission. Collisions of proton cosmic rays with thermal plasma nuclei followed by pion decay can result in enhanced gamma ray emission from the cavity walls.
Brighenti Fabrizio
Mathews William G.
No associations
LandOfFree
Creation of X-ray cavities in galaxy clusters with cosmic rays 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 Creation of X-ray cavities in galaxy clusters with cosmic rays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Creation of X-ray cavities in galaxy clusters with cosmic rays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-328182