Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Flat-spectrum Radio Quasars and BL Lacs Dominate the Anisotropy of the Unresolved Gamma-Ray Background

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [4];  [4]
  1. Stockholm Univ. (Sweden); Univ. of Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy); RWTH Aachen Univ. (Germany)
  2. Univ. of Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy); Univ. of Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  4. Univ. of Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
+ Show Author Affiliations
We analyze the angular power spectrum (APS) of the unresolved gamma-ray background (UGRB) emission and combine it with the measured properties of the resolved gamma-ray sources of the Fermi-LAT 4FGL catalog. Our goals are to dissect the composition of the gamma-ray sky and to establish the relevance of different classes of source populations of active galactic nuclei in determining the observed size of the UGRB anisotropy, especially at low energies. We find that, under physical assumptions for the spectral energy distribution, i.e., by using the 4FGL catalog data as a prior, two populations are required to fit the APS data, namely flat-spectrum radio quasars at low energies and BL Lacs at higher energies. The inferred luminosity functions agree well with the extrapolation of the flat-spectrum radio quasar and BL Lac ones obtained from the 4FLG catalog. We use these luminosity functions to calculate the UGRB intensity from blazars, finding a contribution of 20% at 1 GeV and 30% above 10 GeV. Finally, bounds on an additional gamma-ray emission due to annihilating dark matter are also derived.
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:
1844784
Report Number(s):
FERMILAB-PUB-22-038-T; arXiv:2201.02634; oai:inspirehep.net:2007043
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 933; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (45)

Halo models of large scale structure journal December 2002
The nature of the Diffuse Gamma-Ray Background journal October 2015
Sensitivity projections for dark matter searches with the Fermi large area telescope journal June 2016
The diffuse γ-ray background is dominated by star-forming galaxies journal September 2021
Planck 2018 results: VI. Cosmological parameters journal September 2020
The Structure of Cold Dark Matter Halos journal May 1996
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION journal May 2009
Modeling the Extragalactic Background Light from Stars and dust journal February 2010
THE LUMINOSITY FUNCTION OF FERMI -DETECTED FLAT-SPECTRUM RADIO QUASARS journal May 2012
THE COSMIC EVOLUTION OF FERMI BL LACERTAE OBJECTS journal December 2013
Diffuse γ-Ray Emission from Misaligned Active Galactic Nuclei journal December 2013
THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV journal January 2015
Particle-In-Cell Simulations of Continuously Driven Mirror and ion Cyclotron Instabilities in high beta Astrophysical and Heliospheric Plasmas journal February 2015
THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE journal August 2015
FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG journal March 2012
FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG journal June 2015
Dark Matter Searches in the Gamma-Ray Extragalactic Background via Cross-Correlations with Galaxy Catalogs journal December 2015
Star-forming galaxies as the origin of diffuse high-energy backgrounds: gamma-ray and neutrino connections, and implications for starburst history journal September 2014
Fermi -LAT γ-ray anisotropy and intensity explained by unresolved radio-loud active galactic nuclei journal November 2014
Tomographic-spectral approach for dark matter detection in the cross-correlation between cosmic shear and diffuse γ-ray emission journal June 2015
Constraining dark matter annihilation with cosmic ray antiprotons using neural networks journal December 2021
The accretion history of dark matter haloes – III. A physical model for the concentration–mass relation journal July 2015
Testing gamma-ray models of blazars in the extragalactic sky journal May 2020
Anisotropy of the cosmic gamma-ray background from dark matter annihilation journal January 2006
Gamma-ray background anisotropy from Galactic dark matter substructure journal July 2009
Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT journal April 2012
Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background journal September 2012
Constraining dark matter annihilation with the isotropic γ -ray background: Updated limits and future potential journal January 2014
Composition of the Fermi-LAT isotropic gamma-ray background intensity: Emission from extragalactic point sources and dark matter annihilations journal June 2015
Angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its dark matter interpretation journal December 2016
Astrophysical interpretation of the anisotropies in the unresolved gamma-ray background journal June 2017
Constraining Galactic dark matter with gamma-ray pixel counts statistics journal October 2018
Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data journal March 2010
Particle Dark Matter Searches Outside the Local Group journal June 2015
Unresolved Gamma-Ray Sky through its Angular Power Spectrum journal December 2018
Detection of Cross-Correlation between Gravitational Lensing and γ Rays journal March 2020
The statistics of   CDM halo concentrations journal November 2007
MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics journal October 2009
Particle dark matter searches in the anisotropic sky journal January 2014
DECIPHERING CONTRIBUTIONS TO THE EXTRAGALACTIC GAMMA-RAY BACKGROUND FROM 2 GeV TO 2 TeV journal November 2016
UNVEILING THE GAMMA-RAY SOURCE COUNT DISTRIBUTION BELOW THE FERMI DETECTION LIMIT WITH PHOTON STATISTICS journal July 2016
Deriving the Contribution of Blazars to the Fermi -LAT Extragalactic γ -ray Background at E > 10 GeV with Efficiency Corrections and Photon Statistics journal March 2018
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope journal April 2020
Fermi Large Area Telescope Fourth Source Catalog journal March 2020
Statistical Measurement of the Gamma-Ray Source-Count Distribution as a Function of Energy journal July 2016

Similar Records

Diffuse γ-ray emission from unresolved BL Lac objects
Journal Article · Sat May 10 00:00:00 EDT 2014 · Astrophysical Journal · OSTI ID:22356939
The third catalog of active galactic nuclei detected by the FERMI Large Area Telescope
Journal Article · Tue Sep 01 00:00:00 EDT 2015 · Astrophysical Journal · OSTI ID:22882731
The third catalog of active galactic nuclei detected by the Fermi large area telescope
Journal Article · Mon Aug 24 20:00:00 EDT 2015 · The Astrophysical Journal (Online) · OSTI ID:1354914

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS