Hybrid model of GeV-TeV gamma ray emission from Galactic Center

Abstract

The observations of high energy $\gamma$-ray emission from the Galactic center (GC) by HESS, and recently by Fermi, suggest the cosmic ray acceleration in the GC and possibly around the supermassive black hole. In this work we propose a lepton-hadron hybrid model to explain simultaneously the GeV-TeV $\gamma$-ray emission. Both electrons and hadronic cosmic rays were accelerated during the past activity of the GC. Then these particles would diffuse outwards and interact with the interstellar gas and background radiation field. The collisions between hadronic cosmic rays with gas is responsible to the TeV $\gamma$-ray emission detected by HESS. With fast cooling in the strong radiation field, the electrons would cool down and radiate GeV photons through inverse Compton scattering off the soft background photons. This scenario provides a natural explanation of the observed GeV-TeV spectral shape of $\gamma$-rays.

Journal of Physics G: Nuclear and Particle Physics, 2013

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• Spatial-Dependent Diffusion of Cosmic Rays and the Ratio of pbar/p, B/C
• VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies
• Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012
• Observations of Sagittarius A* during the pericenter passage of the G2 object with MAGIC
• Gamma rays from the Galactic Centre region: a review
• Very-high energy observations of the Galactic center region by VERITAS in 2010-2012
• Gamma-rays from millisecond pulsar population within the central stellar cluster in the Galactic Center
• Leptonic origin of the 100 MeV gamma-ray emission from the Galactic Centre
• Fermi LAT observations of Sagittarius A*: Imaging Analysis
• The Galactic Center: A PeV Cosmic Ray Acceleration Factory
• Constraints on Axion-like Particles from the gamma-ray observation of the Galactic Center
• Origin of X-ray and gamma-ray emission from the Galactic central region
• High Energy Emission from the Galactic Center
• Search for long-term variability of HESS J1745-290