The origin of the extragalactic gamma-ray background and implications for dark matter annihilation
Abstract
The origin of the extragalactic γ-ray background (EGB) has been debated for some time. The EGB comprises the γ-ray emission from resolved and unresolved extragalactic sources, such as blazars, star-forming galaxies, and radio galaxies, as well as radiation from truly diffuse processes. This Letter focuses on the blazar source class, the most numerous detected population, and presents an updated luminosity function and spectral energy distribution model consistent with the blazar observations performed by the Fermi-Large Area Telescope (LAT). Additionally, we show that blazars account for 50$$_{-11}^{+12}$$% of the EGB photons (>0.1 GeV), and that Fermi-LAT has already resolved ~70% of this contribution. Blazars, and in particular hard-spectrum sources such as BL Lacs, are responsible for most of the EGB emission above 100 GeV. We find that the extragalactic background light, which attenuates blazars' high-energy emission, is responsible for the high-energy cutoff observed in the EGB spectrum. Finally, we show that blazars, star-forming galaxies, and radio galaxies can naturally account for the amplitude and spectral shape of the background in the 0.1–820 GeV range, leaving only modest room for other contributions. In conclusion, this allows us to set competitive constraints on the dark matter annihilation cross section.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi-LAT Collaboration
- OSTI Identifier:
- 1355170
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal. Letters (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal. Letters (Online); Journal Volume: 800; Journal Issue: 2; Journal ID: ISSN 2041-8213
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; cosmology; observations – dark matter – gamma rays; diffuse background – galaxies; jets galaxies; active –surveys
Citation Formats
Ajello, M., Gasparrini, D., Sánchez-Conde, M., Zaharijas, G., Gustafsson, M., Cohen-Tanugi, J., Dermer, C. D., Inoue, Y., Hartmann, D., Ackermann, M., Bechtol, K., Franckowiak, A., Reimer, A., Romani, R. W., and Strong, A. W. The origin of the extragalactic gamma-ray background and implications for dark matter annihilation. United States: N. p., 2015.
Web. doi:10.1088/2041-8205/800/2/L27.
Ajello, M., Gasparrini, D., Sánchez-Conde, M., Zaharijas, G., Gustafsson, M., Cohen-Tanugi, J., Dermer, C. D., Inoue, Y., Hartmann, D., Ackermann, M., Bechtol, K., Franckowiak, A., Reimer, A., Romani, R. W., & Strong, A. W. The origin of the extragalactic gamma-ray background and implications for dark matter annihilation. United States. https://doi.org/10.1088/2041-8205/800/2/L27
Ajello, M., Gasparrini, D., Sánchez-Conde, M., Zaharijas, G., Gustafsson, M., Cohen-Tanugi, J., Dermer, C. D., Inoue, Y., Hartmann, D., Ackermann, M., Bechtol, K., Franckowiak, A., Reimer, A., Romani, R. W., and Strong, A. W. Thu .
"The origin of the extragalactic gamma-ray background and implications for dark matter annihilation". United States. https://doi.org/10.1088/2041-8205/800/2/L27. https://www.osti.gov/servlets/purl/1355170.
@article{osti_1355170,
title = {The origin of the extragalactic gamma-ray background and implications for dark matter annihilation},
author = {Ajello, M. and Gasparrini, D. and Sánchez-Conde, M. and Zaharijas, G. and Gustafsson, M. and Cohen-Tanugi, J. and Dermer, C. D. and Inoue, Y. and Hartmann, D. and Ackermann, M. and Bechtol, K. and Franckowiak, A. and Reimer, A. and Romani, R. W. and Strong, A. W.},
abstractNote = {The origin of the extragalactic γ-ray background (EGB) has been debated for some time. The EGB comprises the γ-ray emission from resolved and unresolved extragalactic sources, such as blazars, star-forming galaxies, and radio galaxies, as well as radiation from truly diffuse processes. This Letter focuses on the blazar source class, the most numerous detected population, and presents an updated luminosity function and spectral energy distribution model consistent with the blazar observations performed by the Fermi-Large Area Telescope (LAT). Additionally, we show that blazars account for 50$_{-11}^{+12}$% of the EGB photons (>0.1 GeV), and that Fermi-LAT has already resolved ~70% of this contribution. Blazars, and in particular hard-spectrum sources such as BL Lacs, are responsible for most of the EGB emission above 100 GeV. We find that the extragalactic background light, which attenuates blazars' high-energy emission, is responsible for the high-energy cutoff observed in the EGB spectrum. Finally, we show that blazars, star-forming galaxies, and radio galaxies can naturally account for the amplitude and spectral shape of the background in the 0.1–820 GeV range, leaving only modest room for other contributions. In conclusion, this allows us to set competitive constraints on the dark matter annihilation cross section.},
doi = {10.1088/2041-8205/800/2/L27},
journal = {The Astrophysical Journal. Letters (Online)},
number = 2,
volume = 800,
place = {United States},
year = {Thu Feb 19 00:00:00 EST 2015},
month = {Thu Feb 19 00:00:00 EST 2015}
}
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Cross-correlation of weak lensing and gamma rays: implications for the nature of dark matter
text, January 2016
- Tröster, Tilman; Camera, Stefano; Fornasa, Mattia
- arXiv
Active Galactic Nuclei: what's in a name?
text, January 2017
- Padovani, P.; Alexander, D. M.; Assef, R. J.
- arXiv
Extragalactic Gamma-ray Background from Star-forming Galaxies: Will Empirical Scalings Suffice?
text, January 2017
- Komis, I.; Pavlidou, V.; Zezas, A.
- arXiv
New synthesis models of consistent extragalactic background light over cosmic time
text, January 2018
- Khaire, Vikram; Srianand, Raghunathan
- arXiv
Interpretation of the diffuse astrophysical neutrino flux in terms of the blazar sequence
text, January 2018
- Palladino, Andrea; Rodrigues, Xavier; Gao, Shan
- arXiv
Complementarity of Stacking and Multiplet Constraints on the Blazar Contribution to the Cumulative High-Energy Neutrino Intensity
text, January 2019
- Yuan, Chengchao; Murase, Kohta; Mészáros, Peter
- arXiv
Probing the origin of ultra-high-energy cosmic rays with neutrinos in the EeV energy range using the Pierre Auger Observatory
text, January 2019
- Collaboration, The Pierre Auger; Aab, A.; Abreu, P.
- arXiv
Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope
text, January 2019
- Coronado-Blazquez, Javier; Sanchez-Conde, Miguel A.; Dominguez, Alberto
- arXiv
Detection of cross-correlation between gravitational lensing and gamma rays
text, January 2019
- Ammazzalorso, S.; Gruen, D.; Regis, M.
- arXiv
{\it Fermi}-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection
text, January 2019
- Paliya, Vaidehi S.; Dominguez, Alberto; Ajello, Marco
- arXiv