CONTRIBUTION OF GAMMA-RAY-LOUD RADIO GALAXIES’ CORE EMISSIONS TO THE COSMIC MeV AND GeV GAMMA-RAY BACKGROUND RADIATION

By Y. Inoue. 2011

139 citations recorded by the source corpus.

The Fermi gamma-ray satellite has recently detected gamma-ray emissions from radio galaxy cores. From these samples, we first examine the correlation between the luminosities at 5 GHz, L5 GHz, and at 0.1–10 GeV, Lγ, of gamma-ray-loud radio galaxies. We find that the correlation is significant with Lγ∝L1.165 GHz based on a partial correlation analysis. Using this correlation and the radio luminosity function (RLF) of radio galaxies, we explore the contribution of gamma-ray-loud radio galaxies to the unresolved extragalactic gamma-ray background (EGRB). The gamma-ray luminosity function is obtained by normalizing the RLF to reproduce the source-count distribution of the Fermi gamma-ray-loud radio galaxies. We find that gamma-ray-loud radio galaxies can explain ∼25% of the unresolved Fermi EGRB flux above 100 MeV and will also make a significant contribution to the EGRB in the 1–30 MeV energy band. Since blazars explain 22% of the EGRB above 100 MeV, radio-loud active galactic nucleus populations explain ∼47% of the unresolved EGRB. We further make an interpretation on the origin of the EGRB. The observed EGRB spectrum at 0.2–100 GeV does not show an absorption signature by the extragalactic background light. Thus, the dominant population of the origin of EGRB at very high energy (>30 GeV) might be either nearby gamma-ray-emitting sources or sources with very hard gamma-ray spectra.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6c3bd00aba86cbda2c824b849b8f645f78d37ebf

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In Nuclear and High Energy Physics

Citations in the corpus

THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV (2014, background): “…Fields et al. 2010; Makiya et al. 2011; Stecker & Venters 2011; Ackermann et al. 2012c) and AGN with jets oriented obliquely to our line of sight (Inoue 2011; Di Mauro et al. 2014), the cumulative intensity is almost entirely unresolved by current instruments; calculations of the flux…”
THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND IMPLICATIONS FOR DARK MATTER ANNIHILATION (2015, background): “By summing the contribution of star-forming galaxies (Ackermann et al. 2012) and radio galaxies (Inoue 2011) to the contribution of blazars derived here (see Fig.”
GeV OBSERVATIONS OF STAR-FORMING GALAXIES WITH THE FERMI LARGE AREA TELESCOPE (2012, methodology): “A relationship between the gamma-ray and radio emission of LAT-detected misaligned AGN has been used to estimate that gamma-ray- loud radio galaxies account for∼ 25% of the unresolved IGRB above 0.1 GeV (Inoue 2011).”
Galactic Searches for Dark Matter (2012, background): “Though the above sources are expected to contribute to this emission, there is no well-accepted model for the relative contributions of each of the sources (Fields et al., 2010; Inoue, 2011).”
Open Questions in Cosmic-Ray Research at Ultrahigh Energies (2019, unknown): “For galaxy clusters, we used the estimated rate at z = 0, based on the X-ray luminosity functions of Warren et al. (2006) and Inoue (2011).”
THE LUMINOSITY FUNCTION OF FERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS (2011, background): “The LF of blazars also allows us to evaluate their contribution to the diffuse backgrounds and to determine their relationship with the parent population (Ajello et al. 2008b; Inoue 2011).”
Science with e-ASTROGAM (2017, background): “14 Seyfert galaxies (Gilli 2007) All blazars (Giommi & Padovani 2015) Star-forming galaxies (Lacki et al. 2014) Radio galaxies (Inoue 2011) Adapted from Ackermann et al. (2015) e-ASTROGAM Figure 1.0.3: Compilation of the measurements of the total extragalactic gamma-ray intensity between 1 keV and…”