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Diffuse gamma-ray emission from the Galactic center and implications of its past activities

Published online by Cambridge University Press:  09 February 2017

Yutaka Fujita ,
Shigeo S. Kimura  and
Kohta Murase
Yutaka Fujita
Affiliation:
Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan email: [email protected]
Shigeo S. Kimura
Affiliation:
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan and Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
Kohta Murase
Affiliation:
Center for Particle and Gravitational Astrophysics; Department of Physics; Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
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Abstract

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It has been indicated that low-luminosity active galactic nuclei (LLAGNs) are accelerating high-energy cosmic-ray (CR) protons in their radiatively inefficient accretion flows (RIAFs). If this is the case, Sagittarius A* (Sgr A*) should also be generating CR protons, because Sgr A* is a LLAGN. Based on this scenario, we calculate a production rate of CR protons in Sgr A* and their diffusion in the central molecular zone (CMZ) around Sgr A*. The CR protons diffusing in the CMZ create gamma-rays through pp interaction. We show that the gamma-ray luminosity and spectrum are consistent with observations if Sgr A* was active in the past.

Keywords

cosmic raysgalaxies: activegamma rays: theory
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 214 - 217
Copyright
Copyright © International Astronomical Union 2017 

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