Automatic Quenching of High Energy gamma-ray Sources by Synchrotron Photons

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Here we investigate evolution of a magnetized system, in which continuously produced high energy emission undergoes annihilation on a soft photon field, such that the synchrotron radiation of the created electron-positron pairs increases number density of the soft photons. This situation is important in high energy astrophysics, because, for an extremely wide range of magnetic field strengths (nano to mega Gauss), it involves {gamma}-ray photons with energies between 0.3GeV and 30TeV. We derive and analyze the conditions for which the system is unstable to runaway production of soft photons and ultrarelativistic electrons, and for which it can reach a steady ... continued below

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12 pages

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Stawarz, Lukasz; /KIPAC, Menlo Park /SLAC /Jagiellonian U., Astron. Observ.; Kirk, John & /Heidelberg, Max Planck Inst. February 2, 2007.

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Here we investigate evolution of a magnetized system, in which continuously produced high energy emission undergoes annihilation on a soft photon field, such that the synchrotron radiation of the created electron-positron pairs increases number density of the soft photons. This situation is important in high energy astrophysics, because, for an extremely wide range of magnetic field strengths (nano to mega Gauss), it involves {gamma}-ray photons with energies between 0.3GeV and 30TeV. We derive and analyze the conditions for which the system is unstable to runaway production of soft photons and ultrarelativistic electrons, and for which it can reach a steady state with an optical depth to photon-photon annihilation larger than unity, as well those for which efficient pair loading of the emitting volume takes place. We also discuss the application of our analysis to a realistic situation involving astrophysical sources of a broad-band {gamma}-ray emission and briefly consider the particular case of sources close to active supermassive black holes.

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12 pages

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  • Journal Name: Submitted to ApJLetters

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  • Report No.: SLAC-PUB-12314
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 898867
  • Archival Resource Key: ark:/67531/metadc889062

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  • February 2, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 8:17 p.m.

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Stawarz, Lukasz; /KIPAC, Menlo Park /SLAC /Jagiellonian U., Astron. Observ.; Kirk, John & /Heidelberg, Max Planck Inst. Automatic Quenching of High Energy gamma-ray Sources by Synchrotron Photons, article, February 2, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc889062/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.