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A new model for the Fermi-LAT Extragalactic Gamma-Ray Background

We compute the contribution of blazars (Flat Spectrum Radio Quasars and BL-Lacs) to the Fermi-LAT Extragalactic gamma-ray Background, assuming a gamma-ray luminosity function proportional to the luminosity function of radio galaxies and the Spectral Energy Distribution of blazars given by the so-called blazar sequence. We find that blazars account for the 45% of the total Fermi-LAT EGB. However, at low (<10 GeV) and high (>50 GeV) energies the blazar contribution falls short to account for the observed background light. At E<10 GeV, the Extragalactic gamma-ray Background can be fully explained by considering the additional contribution of star-forming galaxies, whereas at very high energies, where the absorption due to Extragalactic Background Light dominates, the observed background calls for an additional unknown component.

preprint2011arXivOpen access
Massimo CavadiniRuben SalvaterraFrancesco Haardt
astro-ph.HE
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Massimo CavadiniRuben SalvaterraFrancesco Haardt

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