Radio galaxies dominate the high-energy diffuse gamma-ray background
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1288748
- Report Number(s):
- FERMILAB-PUB-16-128-A; arXiv:1604.08505
Journal ID: ISSN 1475-7516; 1452788
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2016; Journal Issue: 08; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Hooper, Dan, Linden, Tim, and Lopez, Alejandro. Radio galaxies dominate the high-energy diffuse gamma-ray background. United States: N. p., 2016.
Web. doi:10.1088/1475-7516/2016/08/019.
Hooper, Dan, Linden, Tim, & Lopez, Alejandro. Radio galaxies dominate the high-energy diffuse gamma-ray background. United States. https://doi.org/10.1088/1475-7516/2016/08/019
Hooper, Dan, Linden, Tim, and Lopez, Alejandro. Tue .
"Radio galaxies dominate the high-energy diffuse gamma-ray background". United States. https://doi.org/10.1088/1475-7516/2016/08/019. https://www.osti.gov/servlets/purl/1288748.
@article{osti_1288748,
title = {Radio galaxies dominate the high-energy diffuse gamma-ray background},
author = {Hooper, Dan and Linden, Tim and Lopez, Alejandro},
abstractNote = {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.},
doi = {10.1088/1475-7516/2016/08/019},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2016,
place = {United States},
year = {Tue Aug 09 00:00:00 EDT 2016},
month = {Tue Aug 09 00:00:00 EDT 2016}
}
Web of Science
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