Radio galaxies dominate the high-energy diffuse gamma-ray background

Hooper, Dan; Linden, Tim; Lopez, Alejandro

doi:10.1088/1475-7516/2016/08/019

Title: Radio galaxies dominate the high-energy diffuse gamma-ray background

Journal Article · Tue Aug 09 00:00:00 EDT 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/08/019· OSTI ID:1288748

Hooper, Dan ^[1]; Linden, Tim ^[2]; Lopez, Alejandro ^[3]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
The Ohio State Univ., Columbus, OH (United States)
Univ. of Michigan, Ann Arbor, MI (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

It has been suggested that unresolved radio galaxies and radio quasars (sometimes referred to as misaligned active galactic nuclei) could be responsible for a significant fraction of the observed diffuse gamma-ray background. In this study, we use the latest data from the Fermi Gamma-Ray Space Telescope to characterize the gamma-ray emission from a sample of 51 radio galaxies. In addition to those sources that had previously been detected using Fermi data, we report here the first statistically significant detection of gamma-ray emission from the radio galaxies 3C 212, 3C 411, and B3 0309+411B. Combining this information with the radio fluxes, radio luminosity function, and redshift distribution of this source class, we find that radio galaxies dominate the diffuse gamma-ray background, generating 77.2(+25.4)(-9.4)% of this emission at energies above ~1 GeV . We discuss the implications of this result and point out that it provides support for scenarios in which IceCube's high-energy astrophysical neutrinos also originate from the same population of radio galaxies.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1288748

Report Number(s):: FERMILAB-PUB-16-128-A; arXiv:1604.08505; 1452788

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 08; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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