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

Yutaka Fujita; Shigeo S. Kimura; Kohta Murase

doi:10.1017/S1743921316011807

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

Yutaka Fujita, Shigeo S. Kimura, Kohta Murase

Research output: Contribution to journal › Article › peer-review

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)
Pages (from-to)	214-217
Number of pages	4
Journal	Proceedings of the International Astronomical Union
Volume	11
DOIs	https://doi.org/10.1017/S1743921316011807
State	Published - Jan 1 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

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title = "Diffuse gamma-ray emission from the Galactic center and implications of its past activities",

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.",

author = "Yutaka Fujita and Kimura, {Shigeo S.} and Kohta Murase",

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AU - Fujita, Yutaka

AU - Kimura, Shigeo S.

AU - Murase, Kohta

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N2 - 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.

AB - 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.

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