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Exploring the Origin of the soft X-ray Excess in Mrk 926 Using Broadband X-ray Observations

Presentation #138.11 in the session “AGN and Quasars 1”.

Published onJan 11, 2021
Exploring the Origin of the soft X-ray Excess in Mrk 926 Using Broadband X-ray Observations

The soft excess represents one of the only major remaining uncertainties in AGN spectral modeling in the X-ray band. Despite much effort, its nature is still a matter of active debate with some convinced it is caused by blurred ionized reflection and others by a warm corona above the accretion disk. We present results from a spectral analysis of an XMM/NuSTAR campaign of the unobscured Seyfert 1 galaxy Mrk 926. These results indicate that Mrk 926’s soft excess cannot be modelled adequately by either of the two currently favored explanations: it requires both. Based on our modeling results, we discuss what the detection of such a hybrid soft excess could mean for the broader AGN population, and what constraints can be placed on theoretical soft excess modelling.


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