Abstract
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.
Original language | English (US) |
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Pages (from-to) | 214-217 |
Number of pages | 4 |
Journal | Proceedings of the International Astronomical Union |
Volume | 11 |
DOIs | |
State | Published - 2016 |
All Science Journal Classification (ASJC) codes
- Medicine (miscellaneous)
- Astronomy and Astrophysics
- Nutrition and Dietetics
- Public Health, Environmental and Occupational Health
- Space and Planetary Science