Searching for PeVatron candidates in the Galactic Plane Survey of CTA.

Stage numéro : M2-2021-CT-01
Laboratoire :Centre de Physique des Particules de Marseille Case 902
 163 avenue de Luminy - 13288 Marseille Cedex 9
Directeur :Cristinel Diaconu - 04.91.82.72.01 - diaconu@cppm.in2p3.fr
Correspondant :William Gillard - 04.91.82.72.67 - gillard@cppm.in2p3.fr
Groupe d'accueil :HESS-CTA
Chef de groupe :Heide Costantini 04.91.82.72.57 - costantini@cppm.in2p3.fr
Responsable de stage :Heide Costantini - 0491 82 72 57 - costant@cppm.in2p3.fr

Thématique : Astroparticules

The Cherenkov Telescope Array (CTA) is a worldwide project to construct the next generation ground based very-high-energy (VHE) gamma-ray instrument [1]. CTA will be situated on both the Northern Hemisphere (La Palma on the Canary Islands) and the Southern Hemisphere (Atacama Desert, Chile) in order to cover the entire sky.

CTA will provide an unprecedented insight into the VHE Universe and in particular will explore the energy region above few tens of TeV for the first time [2]. One of the main goals of CTA is the understanding of the origin of galactic cosmic rays. Astrophysical sources emitting gammas at energies above 50 TeV are very good candidates for cosmic ray accelerators at PeV energies (PeVatrons).

The CPPM is involved since few years in studying the capabilities of CTA in detecting galactic PeVatrons [3]. The goal is to identify promising candidate sources during the galactic plane survey (GPS) for subsequent deeper observations.

In order to test and optimize the analysis techniques well before data taking, the galactic working group of the CTA consortium has recently prepared a detailed simulation of the future GPS. More than 1000 sources of different types (pulsars, supernova remnants, binaries etc.) have been simulated. A sample of few PeVatrons have been also included in the simulation . During the internship the candidate will analyze the GPS simulated data with the aim to extract potential PeVatron candidates applying the search strategy that has been developed at CPPM. The main output of this study will be a comparison of the spectral features obtained for the PeVatron candidates with the input simulated parameters of the selected sources. This result should allow to validate the PeVatron search technique.

The work will be done using the Python package for gamma-ray astronomy analysis gammapy [4]. The candidate should therefore have basic knowledge of Python programming.

References:

[1] https://www.cta-observatory.org/

[2] Science with the Cherenkov Telescope Array: https://arxiv.org/abs/1709.07997

[3]Cherenkov Telescope Array potential in the search for Galactic PeVatrons: https://arxiv.org/abs/1911.06134

[4] https://gammapy.org/