Contribution from TeV halos to the isotropic gamma-ray background
Abstract
Recent observations have shown that pulsars are surrounded by extended regions which emit TeV-scale gamma rays through the inverse Compton scattering of very high energy electrons and positrons. Such TeV halos are responsible for a large fraction of the Milky Way's TeV-scale gamma-ray emission. In this paper, we calculate the gamma-ray spectrum from the population of TeV halos located within the Andromeda Galaxy, predicting a signal that is expected to be detectable by the Cherenkov Telescope Array. We also calculate the contribution from TeV halos to the isotropic gamma-ray background, finding that these sources should contribute significantly to this flux at the highest measured energies, constituting up to ∼20 % of the signal observed above ∼0.1 TeV . We also comment on the implications of our results for the origin of the diffuse neutrino flux detected by IceCube.
- Publication:
-
Physical Review D
- Pub Date:
- July 2022
- DOI:
- 10.1103/PhysRevD.106.023005
- arXiv:
- arXiv:2111.03646
- Bibcode:
- 2022PhRvD.106b3005X
- Keywords:
-
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 9 pages, 3 figures