Nuclear γ-ray emission from very hot accretion flows

Kafexhiu, Ervin; Aharonian, F.; Barkov, M.

doi:10.1051/0004-6361/201833948

Nuclear γ-ray emission from very hot accretion flows

Journal Article · Thu Mar 28 00:00:00 EDT 2019 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201833948· OSTI ID:1612505

Kafexhiu, Ervin ^[1]; Aharonian, F. ^[2]; Barkov, M. ^[3]

Max-Planck-Inst. für Kernphysik, Heidelberg (Germany); DOE/OSTI
Max-Planck-Inst. für Kernphysik, Heidelberg (Germany); Dublin Inst. for Advanced Studies (United Kingdom); National Research Nuclear Univ. MEPhI, Moscow (Russia)
Purdue Univ., West Lafayette, IN (United States); RIKEN, Saitama (Japan); Space Research Institute of the Russian Academy of Sciences (IKI), Moscow (Russia)

Optically thin accretion plasmas can reach ion temperatures T_i ≥ 10¹⁰ K and thus trigger nuclear reactions. Using a large nuclear interactions network, we studied the radial evolution of the chemical composition of the accretion flow toward the black hole and computed the emissivity in nuclear γ-ray lines. In the advection dominated accretion flow (ADAF) regime, CNO and heavier nuclei are destroyed before reaching the last stable orbit. The overall luminosity in the de-excitation lines for a solar composition of plasma can be as high as few times 10⁻⁵ the accretion luminosity (Ṁc²) and can be increased for heavier compositions up to 10⁻³. The efficiency of transformation of the kinetic energy of the outflow into high energy (≥100 MeV) γ-rays through the production and decay of π⁰-mesons can be higher, up to 10⁻² of the accretion luminosity. We show that in the ADAF model up to 15% of the mass of accretion matter can “evaporate” in the form of neutrons.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: NASA; NSF; Russian Science Foundation; USDOE Office of Science (SC)

Grant/Contract Number:: SC0016369

OSTI ID:: 1612505

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 623; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Nuclear γ-ray emission from very hot accretion flows

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References (24)

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