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- W3103442327 abstract "Morphological and spectroscopic evidence suggests that may affect the spatial and velocity distributions of gas in the narrow-line region (NLR) and the extended NLR of some active galaxies. It thus seemed plausible that may energize the NLR also. The observed emission-line ratios strongly favor photoionization as the heating source for this gas, but it is not clear whether the ionizing radiation is generated in the NLR by shocks or whether the ionizing radiation originates at the central continuum source. Here I point out that are highly inefficient in producing line emission. Shocks in the NLR can convert at most ~10-6 of the rest mass to ionizing radiation, compared with a maximum conversion efficiency of ~10-1 for the central continuum source. The required mass flow rate through shocks in the NLR is thus a few orders of magnitude higher than the mass accretion rate required to power the NLR by the central continuum source. Since gravity appears to dominate the NLR cloud dynamics, must lead to an inflow, and the implied high inflow rates can be ruled out in most active galaxies. NLR dynamics driven by a thermal wind or by some jet configurations may produce the mass flux through required for photoionizing to be viable, but the mass flux inward from the NLR must be kept ~100-1000 times smaller. Photoionizing are a viable mechanism in very low luminosity active galaxies if they are highly sub-Eddington (10-4) and if they convert mass to radiation with a very low efficiency (10-4)." @default.
- W3103442327 created "2020-11-23" @default.
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- W3103442327 date "1998-04-01" @default.
- W3103442327 modified "2023-09-27" @default.
- W3103442327 title "A Note on the Viability of Gaseous Ionization in Active Galaxies by Fast Shocks" @default.
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- W3103442327 doi "https://doi.org/10.1086/311250" @default.
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