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

Abstract

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 < Γ< 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 < Γ< 1.5 and with no evidence of a peak in the SED up to energies ~15 TeV.

arXiv comment3 pages, 1 figure, Astronomy & Astrophysics, in press

References in corpus (18)

• The Cosmic Infrared Background: Measurements and Implications
• The Bulk of the Cosmic Infrared Background Resolved by ISOCAM
• Intergalactic Photon Spectra from the Far IR to the UV Lyman Limit for $0<z<6$ and the Optical Depth of the Universe to High Energy Gamma-Rays
• Implications of Cosmological Gamma-Ray Absorption II. Modification of gamma-ray spectra
• PAHs contribution to the infrared output energy of the Universe at z~2
• New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
• Multiwavelength Energy Distributions and Bolometric Luminosities of the 12--Micron Galaxy Sample
• Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421
• An Empirically Based Calculation of the Extragalactic Infrared Background
• Blazar Gamma-Rays, Shock Acceleration, and the Extragalactic Background Light
• Models for Multiband IR Surveys
• An Empirically Based Model for Predicting Infrared Luminosity Functions, Deep Infrared Galaxy Counts and the Diffuse Infrared Background
• Predicted Extragalactic TeV Gamma-Ray Sources
• Observational Gamma-ray Cosmology
• A Bridge from Optical to Infrared Galaxies: Explaining Local Properties, Predicting Galaxy Counts and the Cosmic Background Radiation
• IGR J22517+2218=MG3 J225155+2217: a new gamma-ray lighthouse in the distant Universe
• A Simple Analytic Treatment of the Intergalactic Absorption Effect in Blazar Gamma-ray Spectra
• Discovery of an Extreme MeV Blazar with the Swift Burst Alert Telescope

Cited by in corpus (21)

• Modeling the Extragalactic Background Light from Stars and Dust
• The Milky Way as a Kiloparsec-Scale Axionscope
• A new interpretation of the gamma-ray observations of active galactic nuclei
• Fermi/LAT observations of 1ES 0229+200: implications for extragalactic magnetic fields and background light
• Secondary photons and neutrinos from cosmic rays produced by distant blazars
• Formation of hard very-high energy spectra of blazars in leptonic models
• Photon propagation and the VHE gamma-ray spectra of blazars: how transparent is really the Universe?
• The hard TeV spectrum of 1ES 0229+200: new clues from Swift
• Active Galactic Nuclei under the scrutiny of CTA
• Optical depth for VHE gamma-rays from distant sources from a generic EBL density
• Time structure of gamma-ray signals generated in line-of-sight interactions of cosmic rays from distant blazars
• No Indications of Axion-Like Particles From Fermi
• Systematic search for VHE gamma-ray emission from X-ray bright high-frequency BL Lac objects
• Constraints to Energy Spectra of Blazars based on Recent EBL Limits from Galaxy Counts
• Is the Universe More Transparent to Gamma Rays Than Previously Thought?
• MAGIC upper limits on the GRB 090102 afterglow
• VHE Gamma-Ray Induced Pair Cascades in Blazars and Radio Galaxies: Application to NGC 1275
• Gamma-Ray Absorption By The Cosmic Lyman Continuum From Star-forming Galaxies
• HERMES: Simulating the Propagation of Ultra-High Energy Cosmic Rays
• A new light boson from MAGIC observations?
• Detecting extended gamma-ray emission with the next generation Cherenkov telescopes