Gamma ray signatures of ultra high energy cosmic ray accelerators: electromagnetic cascade versus synchrotron radiation of secondary electrons View Full Text


Ontology type: schema:Chapter      Open Access: True


Chapter Info

DATE

2007

AUTHORS

Stefano Gabici , Felix A. Aharonian

ABSTRACT

We discuss the possibility of observing ultra high energy cosmic ray sources in high energy gamma rays. Protons propagating away from their accelerators produce secondary electrons during interactions with cosmic microwave background photons. These electrons start an electromagnetic cascade that results in a broad band gamma ray emission. We show that in a magnetized Universe (B≳10−12 G) such emission is likely to be too extended to be detected above the diffuse background. A more promising possibility comes from the detection of synchrotron photons from the extremely energetic secondary electrons. Although this emission is produced in a rather extended region of size ∼10 Mpc, it is expected to be point-like and detectable at GeV energies if the intergalactic magnetic field is at the nanogauss level. More... »

PAGES

465-469

Book

TITLE

The Multi-Messenger Approach to High-Energy Gamma-Ray Sources

ISBN

978-1-4020-6117-2
978-1-4020-6118-9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4020-6118-9_71

DOI

http://dx.doi.org/10.1007/978-1-4020-6118-9_71

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018814458


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