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arxiv 0710.2252 v2 pith:KSWFZFWB submitted 2007-10-11 astro-ph

The Spectrum of 1ES0229 + 200 and the Cosmic Infrared Background

classification astro-ph
keywords es0229spectrumenergygamma-rayintrinsicobservationsrelativisticspectral
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We examine the effect of gamma-ray absorption by the extragalactic infrared radiation on intrinsic spectra predicted for 1ES0229+200 and compare our results with the observational data. We find agreement with our previous results on the shape of the IR spectral energy distribution (SED), contrary to the recent assertion of the HESS group. Our analysis indicates that 1ES0229+200 has a very hard intrinsic spectrum with a spectral index between 1.1 +/- 0.3 and 1.5 +/- 0.3 in the energy range between ~0.5 TeV and ~15 TeV. Under the assumptions that (1) the SED models of Stecker, Malkan & Scully (2006) are reasonable as derived from numerous detailed IR observations, and (2) spectral indexes in the range 1 < \Gamma < 1.5 have been shown to be obtainable from relativistic shock acceleration under the astrophysical conditions extant in blazar flares (Stecker, Baring & Summerlin 2007), the fits to the observations of 1ES0229+200 using our previous IR SEDs are consistent with both the IR and gamma-ray observations. Our analysis presents evidence indicating that the energy spectrum of relativistic particles in 1ES0229+200 is produced by relativistic shock acceleration, producing an intrinsic gamma-ray spectrum with index 1 < \Gamma < 1.5 and with no evidence of a peak in the SED up to energies ~15 TeV.

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Cited by 1 Pith paper

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  1. Magnetic monopole plasma oscillations and implications for TeV blazars

    hep-ph 2026-06 unverdicted novelty 6.0

    Monopole-induced IGMF oscillations collimate blazar cascade particles and tighten monopole flux bounds to 6e-23 cm^-2 s^-1 sr^-1 from halo observations of 1ES 0229+200.