The H.E.S.S. collaboration recently reported a new analysis of the gamma-ray diffuse emission from a "semi-annulus" region of 1.4 × 10-4 steradiants around Sagittarius A∗. The gamma-ray spectral energy distribution measured from this region suggests the presence of interacting cosmic rays at PeV energies. This analysis adds a important piece to the previous measurements obtained with Fermi-LAT, H.E.S.S. and VERITAS telescopes in this particular region of the Central Molecular Zone. Here we describe this diffuse gamma-ray emission observed around the galactic center within a comprensive model implying a cosmic-ray population with a harder spectrum in the central part of the galaxy respect to the standard scenarios. With this phenomenological model we obtain the expected diffuse gamma-ray and neutrino components for this target rich region considering the energy range from GeV to PeV. While for the gamma-ray expectations we compare the results with the data of the mentioned experiments, for the expected neutrino spectra we consider the possibility to observe the signal with Cherenkov telescopes.
Modeling the Galactic center emission from GeV to PeV / Marinelli, A.; Gaggero, D.; Grasso, D.; Taoso, M.; Urbano, A.; Valli, M.. - In: EPJ WEB OF CONFERENCES. - ISSN 2101-6275. - 136:(2017), p. 03016. [10.1051/epjconf/201713603016]
Modeling the Galactic center emission from GeV to PeV
Marinelli A.;
2017
Abstract
The H.E.S.S. collaboration recently reported a new analysis of the gamma-ray diffuse emission from a "semi-annulus" region of 1.4 × 10-4 steradiants around Sagittarius A∗. The gamma-ray spectral energy distribution measured from this region suggests the presence of interacting cosmic rays at PeV energies. This analysis adds a important piece to the previous measurements obtained with Fermi-LAT, H.E.S.S. and VERITAS telescopes in this particular region of the Central Molecular Zone. Here we describe this diffuse gamma-ray emission observed around the galactic center within a comprensive model implying a cosmic-ray population with a harder spectrum in the central part of the galaxy respect to the standard scenarios. With this phenomenological model we obtain the expected diffuse gamma-ray and neutrino components for this target rich region considering the energy range from GeV to PeV. While for the gamma-ray expectations we compare the results with the data of the mentioned experiments, for the expected neutrino spectra we consider the possibility to observe the signal with Cherenkov telescopes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
