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CTA sensitivity to the high-energy tail of the Fermi GeV excess
- Source :
- Proceedings of Science, 395:562. Sissa Medialab Srl
- Publication Year :
- 2022
-
Abstract
- Past studies of the $\textit{Fermi}$ Galactic Center Excess (GCE) have found evidence for a ``high-energy tail'' in the GCE spectrum. Such a signature could be the result of inverse-Compton (IC) gamma rays produced by the injection of electrons/positrons into the interstellar medium by the putative population of millisecond pulsar (MSPs) responsible for the GCE. For this ICRC 2021 contribution, we present the results of an exhaustive study on simulated data, in which we analyze the detection potential of the forthcoming Cherenkov Telescope Array (CTA) to the high-energy tail of the $\textit{Fermi}$ GeV excess. In particular, we find that CTA will have sufficient sensitivity to detect this signal for physically reasonable electron/positron acceleration efficiencies, provided that the Galactic diffuse emission model (GDE) is well understood. Furthermore, we discuss the necessary conditions for a reliable CTA discovery in the case of a high degree of uncertainties in the GDE model. We also show that in the event that CTA observes an excess of diffuse gamma rays in the Galactic bulge, it will be able to discriminate between the dark matter and MSPs hypotheses, based on their distinct spatial morphologies.
- Subjects :
- Physics
education.field_of_study
Astrophysics::High Energy Astrophysical Phenomena
Population
Dark matter
Galactic Center
Astrophysics::Instrumentation and Methods for Astrophysics
Gamma ray
Astrophysics
Cherenkov Telescope Array
Interstellar medium
Millisecond pulsar
education
Fermi Gamma-ray Space Telescope
Subjects
Details
- Language :
- English
- ISSN :
- 18248039
- Database :
- OpenAIRE
- Journal :
- Proceedings of Science, 395:562. Sissa Medialab Srl
- Accession number :
- edsair.doi.dedup.....d58aafd69ade365eebfedbc620d46e71