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- W4313361447 abstract "An important parameter in the theory of hot accretion flows around black holes is $delta$, which describes the fraction of ``viscously'' dissipated energy in the accretion flow that goes directly into heating electrons. For a given mass accretion rate, the radiative efficiency of a hot accretion flow is determined by $delta$. Unfortunately, the value of $delta$ is hard to determine from first principles. The recent Event Horizon Telescope Collaboration (EHTC) results on M87* and Sgr A* provide us with a different way of constraining $delta$. By combining the mass accretion rates in M87* and Sgr A* estimated by the EHTC with the measured bolometric luminosities of the two sources, we derive good constraints on the radiative efficiencies of the respective accretion flows. In parallel, we use a theoretical model of hot magnetically arrested disks (MAD) to calculate the expected radiative efficiency as a function of $delta$ (and accretion rate). By comparing the EHTC-derived radiative efficiencies with the theoretical results from MAD models, we find that Sgr A* requires $delta ga 0.3$. %with the most likely value being $delta sim 0.5$. A similar comparison in the case of M87* gives inconclusive results as there is still a large uncertainty in the accretion rate in this source." @default.
- W4313361447 created "2023-01-06" @default.
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- W4313361447 creator A5080658446 @default.
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- W4313361447 date "2022-12-30" @default.
- W4313361447 modified "2023-10-14" @default.
- W4313361447 title "Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*" @default.
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- W4313361447 doi "https://doi.org/10.3847/1538-4357/aca534" @default.
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