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X-ray vision on local obscured AGN

Authors: Marchesi, Stefano; Vignali, Cristian; Sengupta, Dhrubojyoti;

X-ray vision on local obscured AGN

Abstract

Most of the Cosmic X-ray Background (CXB) radiation from 1-100 keV is the result of AGN emission. Unlike unobscured AGN, the detection of obscured AGN, which are responsible for a significant fraction (~40% at peak) of the CXB, is found to be challenging. By observation, the obscured Compton-Thick (those with column density>10^24cm^-2) AGN fraction in the local universe is ~10-45% lower than expected from CXB population synthesis models. Therefore, to fill the gap between observations and model predictions, an almost complete census of obscured AGN is needed at different wavelengths. The nuclear obscuration in these AGN-galaxy (at least at low redshift) is caused by the circum-nuclear material of molecular and dusty clouds called ''torus". But its geometrical, physical and chemical properties are far from being accurately known. On that path, I have presented a comprehensive and systematic analysis of seven obscured AGN candidates in the local Universe (z<0.05) through X-ray spectral analysis with Chandra and XMM-Newton at E<10 keV, coupled with NuSTAR data at E>10 keV. The purpose is to study different properties of the torus from an X-ray point of view over the energy range ~0.6-50 keV using physically motivated uniform torus models like- MyTorus, borus02. I also added our results with the previous works and updated the census of CT-AGN for z<0.05.

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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