Name: Tathagata Saha
Affiliation: Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Conference ID : ASI2022_184
Title : Determination of AGN torus morphology using X-ray spectra: A reliability study
Authors : Tathagata Saha, Alex G. Markowitz, Johannes Buchner
Abstract Type: Poster
Abstract Category : Extragalactic Astronomy
Abstract : Several models of the X-ray reprocessing of the AGN torus have been recently released, (UXCLUMPY, CTORUS, MYTORUS etc.). They span a range of assumed torus geometries and morphologies. The degeneracies in these models can limit reliable constraints of parameters of interest, such as the intrinsic photon index and parameters determining torus morphology. To investigate these effects, we simulate synthetic data under XMM- Newton and NuSTAR response files based on six different models. We use Bayesian methods to analyze the simulated datasets with the same set of models. For exposure times and fluxes typical of nearby Compton-thick AGN, several geometrical parameters remain unconstrained. In addition, distinction of model or morphology using Bayesian methods is possible only if we have a high intrinsic value of flux for a typical exposure time. Our project aims to provide guidance for the X-ray community both in terms of the accuracy in applying the correct torus model (with implications for conclusions on the torus geometry and morphology) and the robustness of estimation of model parameters(with implications for limitations on precision of those parameters).