Reprocessed emission from warped accretion discs induced by the Bardeen-Petterson effect - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: The broad Balmer emission-line profiles resulting from the reprocessing ofUV-X-ray radiation from a warped accretion disc induced by theBardeen-Petterson effect are studied. We adopt a thin warped disc geometry anda central ring-like illuminating source in our model. We compute thesteady-state shape of the warped disc numerically, and then use it in thecalculation of the line profile. We find that, from the outer radius to theinner radius of the disc, the warp is twisted by an angle of $\sim\pi$ beforebeing flattened efficiently into the equatorial plane. The profiles obtaineddepend weakly on the illuminating source radius in the range from $3r {g}$ to$10r g$, but depend strongly on this radius when it approaches the marginallystable orbit of an extreme Kerr black hole. Double- or triplet-peaked lineprofiles are present in most cases when the illuminating source radius is low.The triplet-peaked line profiles observed from the Sloan Digital Sky Survey maybe a {-}signature- of a warped disc.



Author: Sheng-Miao Wu, Lei Chen, Feng Yuan

Source: https://arxiv.org/



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