Publication: Nuclear gamma-ray emission from very hot accretion flows
Дата
2019
Авторы
Kafexhiu, E.
Barkov, M.
Aharonian, F.
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Аннотация
Optically thin accretion plasmas can reach ion temperatures T-i >= 10(10) 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 gamma-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 ((M) over dotc(2)) and can be increased for heavier compositions up to 10(-3). The e ffi ciency of transformation of the kinetic energy of the outflow into high energy (>= 100 MeV) gamma-rays through the production and decay of pi(0)-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.
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Цитирование
Kafexhiu, E. Nuclear gamma-ray emission from very hot accretion flows / Kafexhiu, E, Barkov, M, Aharonian, F // Astronomy and Astrophysics. - 2019. - 623. - 10.1051/0004-6361/201833948
URI
https://www.doi.org/10.1051/0004-6361/201833948
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https://openrepository.mephi.ru/handle/123456789/16788
https://www.scopus.com/record/display.uri?eid=2-s2.0-85063873223&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000462556200001
https://openrepository.mephi.ru/handle/123456789/16788