Exploring the population of Galactic very-high-energy γ-ray sources

THE CTA CONSORTIUM

Research output: Contribution to journalConference articlepeer-review

Abstract

At very high energies (VHE), the emission of γ rays is dominated by discrete sources. Due to the limited resolution and sensitivity of current-generation instruments, only a small fraction of the total Galactic population of VHE γ-ray sources has been detected significantly. The larger part of the population can be expected to contribute as a diffuse signal alongside emission originating from propagating cosmic rays. Without quantifying the source population, it is not possible to disentangle these two components. Based on the H.E.S.S. Galactic plane survey, a numerical approach has been taken to develop a model of the population of Galactic VHE γ-ray sources, which is shown to account accurately for the observational bias. We present estimates of the absolute number of sources in the Galactic Plane and their contribution to the total VHE γ-ray emission for five different spatial source distributions. Prospects for CTA and its ability to constrain the model are discussed. Finally, first results of an extension of our modelling approach using machine learning to extract more information from the available data set are presented.

Original languageEnglish (US)
Article number798
JournalProceedings of Science
Volume395
StatePublished - Mar 18 2022
Externally publishedYes
Event37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany
Duration: Jul 12 2021Jul 23 2021

Bibliographical note

Funding Information:
This work was conducted in the context of the CTA Consortium. We gratefully acknowledge financial support from the agencies and organisations listed here: http://www.cta-observatory. org/consortium_acknowledgments.

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.

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