February 2-5, 2021

Oral Presentation

Systematic Study of AGN Clumpy Tori with Broadband X-ray Spectroscopy: Updated Unified Picture of AGN Structure

Author(s): Shoji Ogawa (Kyoto University) Yoshihiro Ueda (Kyoto University) Atsushi Tanimoto (The University of Tokyo) Satoshi Yamada (Kyoto University)

Presenter: Shoji Ogawa (Kyoto University)

We present the results of a systematic, broadband X-ray spectral
analysis of nearby active galactic nuclei (AGNs) with the X-ray clumpy
torus model (XCLUMPY; Tanimoto et al. 2019). By adding 16 AGNs newly
analyzed in this paper, we study total 28 AGNs including unabsorbed and
absorbed AGNs taken from Ichikawa et al. (2015) and
Garc\'ia-Bernete et al. (2019). This is the largest sample whose X-ray and infrared
spectra are analyzed by the clumpy torus models XCLUMPY and CLUMPY (Nenkova et al. 2008), respectively. The relation between
the Eddington ratio and the torus covering factor determined from the
X-ray torus parameters of each object follows the trend found by
Ricci et al. (2017) based on a statistical analysis. We confirm the
results by Tanimoto et al. (2020) that (1) the torus angular widths
determined by the infrared data are larger than those by the X-ray data
and that (2) the ratios of the hydrogen column density to V-band
extinction (N_H/A_V) along the line of sight in obscured
AGNs are similar to the Galactic value on average.
Unobscured AGNs show apparently smaller line-of-sight N_H/A_V ratios than the Galactic one.
Our findings can be well explained by an updated unified picture of AGN structure including a dusty torus, dusty polar outflows, and dust-free gas, where the inclination determines the X-ray
and optical classifications and observed torus properties in the X-ray
and infrared bands.

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