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An Estimation of the Lower Bound on the Extragalactic TeV [formula omitted]-ray Background.
- Source :
-
Chinese Astronomy & Astrophysics . Apr2022, Vol. 46 Issue 2, p42-54. 13p. - Publication Year :
- 2022
-
Abstract
- Fermi satellite released fairly accurate measurement of extragalactic gamma-ray background (EGB) from 100 MeV to 820 GeV, which dramatically improves our understanding of the high energy gamma-ray background. But for TeV band, space detectors are useless, and we must rely on ground based gamma-ray telescopes such as imaging atmospheric Cherenkov telescopes (IACTs). Until now, the extragalactic TeV gamma-ray background has not been well investigated. In this paper, we calculate the lower bound of extragalactic TeV gamma-ray background radiation by using the energy spectrum of low state of 61 TeV sources, including 53 blazars, 6 radio galaxies, and 2 star-burst galaxies, respectively. Our results show that blazars are the main contributor of the extragalactic TeV gamma-ray background, especially for Mrk 501 and Mrk 421, whose contribution at 0.5-4.5 TeV is about 58 %. And the contribution above 4.5 TeV are mainly from the sources H 1426+428, 1ES 1959+650, and 1ES 0229+200, their energy spectrum distribution has been extended to more than 10 TeV. Finally, we calculate the contribution of blazars, radio galaxies, and star-burst galaxies, respectively. Similar calculation is used to subclass of blazars and sources with different redshifts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02751062
- Volume :
- 46
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Chinese Astronomy & Astrophysics
- Publication Type :
- Academic Journal
- Accession number :
- 157388376
- Full Text :
- https://doi.org/10.1016/j.chinastron.2022.05.003