The International Cosmic Ray Conference 2017

12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[CRD106] Identi fication of Neutrinos and Gamma-Rays from the Galactic Center and the Cygnus-X Complex

Speakers

• Mehmet GUENDUEZ

Description

The abundance of accelerators and the ambient conditions make Cygnus X and the Galactic Center a natural laboratory for studying the life cycle of cosmic-rays (CRs). This naturally makes them a highly interesting source in neutrino astronomy, in particular concerning a possible detection with the IceCube Neutrino Observatory. In this paper, we model the multiwavelength spectrum of the Cygnus X, for the first time using a broad data set from radio, MeV (COMPTEL), GeV (Fermi), TeV (Argo) and 10s of TeV (Milagro) energies. The modeling is performed assuming a leptohadronic model. We solve the steady-state transport equation for leptons and hadrons injected homogeneously. The best-fit parameters we find are a magnetic field of $B=8.9 imes10^{-6}$ G, a target density of $N_t=19.4$ cm$^{-3}$, a cosmic ray spectral index of $alpha=2.37$ and neutral gas distribution over a depth of 116 pc. We find that the fit describes the data up to TeV energies well, while the Milagro data are underestimated. This transport model with a broad multiwavelength fit provides a neutrino flux which approaches the sensitivity of IceCube at very high energies ($>$ 50 TeV). In April 2016 the HESS-Collaboration reported the detection of a diffuse high energy $gamma$-ray flux from the Central Molecular Zone in the Galactic Center. The HESS-results suggest a hadronic origin, which would require proton energies in PeV-range. This work aims to find also a realistic transport model for these protons which considers the radial dependency. In doing so, the results can be compared with conventional models which do not consider an adapted transport model including the radial dependency. In our models without radial dependency, the predicted neutrino spectrum cannot be observed yet. With this rather pessimistic model, leaving out the influence of possible strong, high-energy point sources, we already expect the flux in the Cygnus X region and the Galactic Center to suffice for IceCube and the enhancement with IceAct to measure a significant neutrino flux in the next decade.