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  Spectral and temporal signatures of ultrarelativistic protons in compact sources I. Effects of Bethe-Heitler pair production

Mastichiadis, A., Protheroe, R. J., & Kirk, J. G. (2005). Spectral and temporal signatures of ultrarelativistic protons in compact sources I. Effects of Bethe-Heitler pair production. Astronomy & Astrophysics, 433(3), 765-776. Retrieved from http://de.arxiv.org/pdf/astro-ph/0501156.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-8934-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-8935-B
Genre: Journal Article

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 Creators:
Mastichiadis, A.1, Author
Protheroe, R. J.1, Author
Kirk, J. G.2, Author              
Affiliations:
1Department of Physics, University of Athens, Panepistimiopolis, 15783, Zografos, Greece Department of Physics and Mathematical Physics, University of Adelaide, North Terrace, Adelaide, SA 5005, Australia, ou_persistent22              
2Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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 Abstract: We present calculations of the spectral and temporal radiative signatures expected from ultrarelativistic protons in compact sources. The coupling between the protons and the leptonic component is assumed to occur via Bethe-Heitler pair production. This process is treated by modeling the results of Monte-Carlo simulations and incorporating them in a time-dependent kinetic equation, that we subsequently solve numerically. Thus, the present work is, in many respects, an extension of the leptonic "one-zone" models to include hadrons. Several examples of astrophysical importance are presented, such as the signature resulting from the cooling of relativistic protons on an external black-body field and that of their cooling in the presence of radiation from injected electrons. We also investigate and refine the threshold conditions for the "Pair Production/Synchrotron" feedback loop which operates when relativistic protons cool efficiently on the synchrotron radiation of the internally produced Bethe-Heitler pairs. We demonstrate that an additional component of injected electrons lowers the threshold for this instability.

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Language(s): eng - English
 Dates: 2005-04
 Publication Status: Published in print
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Title: Astronomy & Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 433 (3) Sequence Number: - Start / End Page: 765 - 776 Identifier: -