A New Result on the Origin of the Extragalactic Gamma-ray Background
arXiv:1304.3575 · doi:10.1088/0004-637X/769/2/153
Abstract
In the paper, we continually use the method of image stacking to study the origin of the extragalactic gamma-ray background (EGB) at GeV bands, and find that the Faint Images of the Radio Sky at Twenty centimeters (FIRST) sources undetected by the Large Area Telescope on the Fermi Gamma-ray Space Telescope can contribute about (56{plus minus}6)% of the EGB. Because the FIRST is a flux limited sample of radio sources with incompleteness at the faint limit, we consider that the point-sources, including blazars, non-blazar AGNs,starburst galaxies, could produce a much larger fraction of the EGB.
Accepted for publication in ApJ, 23 pages, 10 figures
References in corpus (11)
- Fermi Large Area Telescope Bright Gamma-ray Source List
- Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
- The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
- The Starburst Contribution to the Extra-Galactic Gamma-Ray Background
- Cosmic Gamma-Ray Background from Star-Forming Galaxies
- Statistics of Cosmological Black Hole Jet Sources: Blazar Predictions for GLAST
- The Cosmic MeV Gamma-ray Background and Hard X-ray Spectra of Active Galactic Nuclei: Implications for the Origin of Hot AGN Coronae
- Contribution from Star-Forming Galaxies to the Cosmic Gamma-Ray Background Radiation
- BL Lac Contribution to the Extragalactic Gamma-Ray Background
- How many radio-loud quasars can be detected by the Gamma-Ray Large Area Space Telescope?
- Gamma-ray background: a review