Poster Presentation
Nuclear Structure in Radio Galaxies by Broadband X-Ray Spectral Analysis
Presenter: YUYA Nakatani (Kyoto University)
The mechanisms for the co-evolution of galaxies and supermassive black holes (SMBHs) remain a key unsolved issue in astronomy.
To tackle this problem, it is necessary to investigate the structures of AGNs, in particular the “tori”, which work as mass suppliers to the SMBHs.
The torus structures of radio galaxies have not been systematically studied, even though they are an essential population for understanding AGN feedback by jets on the surrounding environments.
Here we present the results of a systematic, broadband X-ray spectral analysis of hard X-ray selected radio galaxies to investigate their nuclear structures.
In this study, we focus on 7 radio-loud AGNs ($\log (L_{\rm radio}/L_{\rm X})>-2.7$) detected in the Swift/BAT 70 month catalog.
The 0.2--70 keV spectra obtained with Suzaku, Swift, and NuSTAR are analyzed by utilizing the X-ray clumpy torus model (XCLUMPY).
We estimate the intrinsic X-ray luminosities and the torus properties, such as the hydrogen column density along the equatorial plane and torus angular width.
We find that these radio galaxies have similar torus covering factors compared with radio quiet AGNs at the same Eddington ratios.
This result suggests that (1) the torus structure is not an important factor that determines the presence of jets and (2) AGN jets have physically little effect on the torus.
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