Speaker
Description
Bowen lines, such as NIII4640 and NIII4100, were predicted to be detectable in supermassive black holes decades ago. However, they were only recently discovered in 2019 through extreme events such as tidal disruption events (TDEs), Changing Look AGNs, and Bowen Fluorescent Flare. The Bowen mechanism employs resonant absorption, EUV emission and outflows to account for the relatively strong line strengths of these Bowen lines without requiring super-solar nitrogen abundances.
In this talk, I will focus on simulating Bowen lines in TDEs, though the results can be generalized to any accretion flow. Utilizing a radiative transfer code within typical extreme accretion flow geometries, I will demonstrate how the different spectroscopic classes of TDEs are determined by the ionization level. I will also explain the conditions under which a Bowen-strong spectrum can be reproduced.