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Monthly notices of the Royal Astronomical Society. Letters, 2010-07, Vol.406 (1), p.L70-L74
2010
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Details

Autor(en) / Beteiligte
Titel
The intergalactic magnetic field constrained by Fermi/Large Area Telescope observations of the TeV blazar 1ES 0229+200
Ist Teil von
  • Monthly notices of the Royal Astronomical Society. Letters, 2010-07, Vol.406 (1), p.L70-L74
Ort / Verlag
Oxford, UK: Blackwell Publishing Ltd
Erscheinungsjahr
2010
Quelle
Wiley Online Library All Journals
Beschreibungen/Notizen
  • TeV photons from blazars at relatively large distances, interacting with the optical–infrared cosmic background, are efficiently converted into electron–positron pairs. The produced pairs are extremely relativistic (Lorentz factors of the order of 106– 107) and promptly lose their energy through inverse Compton scatterings with the photons of the microwave cosmic background, producing emission in the GeV band. The spectrum and the flux level of this reprocessed emission are critically dependent on the intensity of the intergalactic magnetic field, B, that can deflect the pairs diluting the intrinsic emission over a large solid angle. We derive a simple relation for the reprocessed spectrum expected from a steady source. We apply this treatment to the blazar 1ES0229+200, whose intrinsic, very hard TeV spectrum is expected to be approximately steady. Comparing the predicted reprocessed emission with the upper limits measured by the Fermi/Large Area Telescope, we constrain the value of the intergalactic magnetic field to be larger than B≃ 5 × 10−15 G, depending on the model of extragalactic background light.
Sprache
Englisch
Identifikatoren
ISSN: 1745-3925
eISSN: 1745-3933
DOI: 10.1111/j.1745-3933.2010.00884.x
Titel-ID: cdi_proquest_miscellaneous_787050830

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