[phys4phys] Naučno-stručni skup AO u 12 časova (19.06.2024.)

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Predavač: Bert Vander Meulen

Naslov: An X-ray View on AGN Circumnuclear Media with SKIRT

Rezime:
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Active galactic nuclei (AGN) are surrounded by large amounts of cold gas 
and dust, that reprocess (and obscure) the emission of the central 
engine. The 3D radiative transfer code "SKIRT" has recently been 
extended into the X-ray range, to study this circumnuclear medium based 
on reprocessed X-ray features (Vander Meulen et al. 2023). Furthermore, 
SKIRT can also model X-ray polarisation (Vander Meulen et al. subm.), 
providing two additional observables on the AGN circumnuclear medium: 
the polarisation degree and polarisation angle. The simulation domain of 
SKIRT now self-consistently covers the X-ray to mm wavelength range, 
with all features of the established SKIRT framework available.

We used SKIRT to model the parsec-scale circumnuclear medium of Circinus 
AGN in the X-ray band, adopting a distribution of gas and dust 
consistent with previous observations in the MIR. This model 
incorporates the clumpy structure of the polar wind component, X-ray 
interactions with dust grains, and 3D kinematics, thereby improving upon 
previous X-ray modelling efforts. Additionally, this SKIRT model can 
explain the UV-to-IR observations of Circinus AGN (Stalevski et al. 
2017, 2019), linking dust modelling to X-ray reprocessing. We compare 
our model spectra to observational X-ray data from Chandra and NuSTAR, 
and discuss our model parameters. Finally, we demonstrate how SKIRT can 
be used to constrain the 3D structure of AGN circumnuclear media with 
XRISM.
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