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- W2785580136 abstract "We investigate the escape of Ly$beta$ from emission nebulae with a significant population of excited hydrogen atoms in the level $n=2$, rendering them optically thick in H$alpha$. The transfer of Ly$beta$ line photons in these optically thick regions is complicated by the presence of another scattering channel leading to re-emission of H$alpha$, alternating their identities between Ly$beta$ and H$alpha$. In this work, we develop a Monte Carlo code to simulate the transfer of Ly$beta$ line photons incorporating the scattering channel into H$alpha$. Both H$alpha$ and Ly$beta$ lines are formed through diffusion in frequency space, where a line photon enters the wing regime after a fairly large number of resonance scatterings with hydrogen atoms. Various line profiles of H$alpha$ and Ly$beta$ emergent from our model nebulae are presented. It is argued that the electron temperature is a critical parameter which controls the flux ratio of emergent Ly$beta$ and H$alpha$. Specifically for $T=3 times 10^4{rm K}$ and H$alpha$ line center optical depth $tau_alpha=10$, the number flux ratio of emergent Ly$beta$ and H$alpha$ is $sim 49$ percent, which is quite significant. We propose that the leaking Ly$beta$ can be an interesting source for the formation of H$alpha$ wings observed in many symbiotic stars and active galactic nuclei. Similar broad H$alpha$ wings are also expected in Ly$alpha$ emitting halos found in the early universe, which can be potentially probed by the {it James Webb Telescope} in the future." @default.
- W2785580136 created "2018-02-23" @default.
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- W2785580136 date "2018-02-11" @default.
- W2785580136 modified "2023-09-27" @default.
- W2785580136 title "Escape of Resonantly Scattered Ly$beta$ and H$alpha$ from Hot and Optically Thick Media" @default.
- W2785580136 cites W1968369748 @default.
- W2785580136 doi "https://doi.org/10.5303/jkas.2018.51.1.5" @default.
- W2785580136 hasPublicationYear "2018" @default.
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