2009

The Cosmological Evolution of Blazars and the Extragalactic Gamma-Ray Background in the Fermi Era

Inoue, Yoshiyuki, Totani, Tomonori, Inoue, Susumu et al.

Understand

The latest determination of the extragalactic gamma-ray background (EGRB) radiation by Fermi is compared with the theoretical prediction of the blazar component by Inoue & Totani (2009; hereafter IT09).

The Fermi EGRB spectrum is in excellent agreement with IT09, indicating that blazars are the dominant component of the EGRB, and contributions from any other sources (e.g., dark matter annihilations) are minor.
It also indicates that the blazar SED (spectral energy distribution) sequence taken into account in IT09 is a valid description of mean blazar SEDs.
The possible contribution of MeV blazars to the EGRB in the MeV band is also discussed.

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