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

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

2011-10-31

arxiv.org/abs/1110.6889v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

2011 Fermi Symposium proceedings - eConf C110509

Scientific paper

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.

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