Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-04-27
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
12 pages, 6 figures
Scientific paper
The presence of weak intergalactic magnetic fields can be studied by their effect on electro-magnetic cascades induced by multi-TeV gamma-rays in the cosmic radiation background. Small deflections of secondary electrons and positrons as the cascade develops extend the apparent size of the emission region of distant TeV gamma-ray sources. These gamma-ray halos can be resolvable in imaging atmospheric Cherenkov telescopes and serve as a measure of the intergalactic magnetic field strength and coherence length. We present a method of calculating the gamma-ray halo for isotropically emitting sources by treating magnetic deflections in the cascade as a diffusion process. With this ansatz the moments of the halo follow from a set of simple diffusion-cascade equations. The reconstruction of the angular distribution is then equivalent to a classical moment problem. We present a simple solution using Pade approximations of the moment's generating function.
No associations
LandOfFree
Gamma-ray halos as a measure of intergalactic magnetic fields: a classical moment problem 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 Gamma-ray halos as a measure of intergalactic magnetic fields: a classical moment problem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-ray halos as a measure of intergalactic magnetic fields: a classical moment problem will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-475901