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 journalArticlepeer-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 languageEnglish (US)
Pages (from-to)214-217
Number of pages4
JournalProceedings of the International Astronomical Union
Volume11
DOIs
StatePublished - 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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