γ-Ray Luminosity Function and the Contribution to Extragalactic γ-Ray Background for Fermi-detected Blazars

Details γ-Ray Luminosity Function and the Contribution to Extragalactic γ-Ray Background for Fermi-detected Blazars γ-Ray Luminosity Function and the Contribution to Extragalactic γ-Ray Background for Fermi-detected Blazars

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749..151z&link_type=abstract

The Astrophysical Journal, Volume 749, Issue 2, article id. 151 (2012).

Astronomy and Astrophysics

Astronomy

Galaxies: Active, Quasars: General, Quasars: Individual: Γ-Rays, Radiation Mechanisms: Non-Thermal

Scientific paper

We study γ-ray luminosity functions (GLFs) and the contribution to the extragalactic diffuse γ-rays for blazars. After using a clean blazar sample in which 485 blazars are observed at both the 8.4 GHz and ~ GeV bands, we investigate the radio/γ-ray luminosity correlation and find out that a strong correlation exists between the radio and γ-ray luminosities using the partial correlation analysis method. Based on such a correlation, we obtain the GLF, while also considering the GLF based on studies of the X-ray luminosity function of active galactic nuclei and the GLF of the EGRET blazars. K-S tests indicate that these three kinds of GLFs are consistent with the observed data of our sample in a reasonable parameter range. Using these GLFs, we further investigate the blazar contribution to the extragalactic diffuse γ-ray background (EGRB). Our results show that (1) the contribution of blazars are ~21.3% ± 2.7%, ~12.9% ± 1.7%, and ~37.9% ± 4.8% of unresolved Fermi EGRB flux for the three GLFs and (2) the contribution of flat-spectrum radio quasars are ~11.2% ± 1.6%, ~6.9% ± 1.0%, and ~9.0% ± 1.2% of unresolved Fermi EGRB flux for the three GLFs.

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