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2021ApJ...906...84O - Astrophys. J., 906, 84-84 (2021/January-2)

Systematic study of AGN clumpy tori with broadband X-ray spectroscopy: updated unified picture of AGN structure.


Abstract (from CDS):

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). By adding 16 AGNs newly analyzed in this paper, we study a total of 28 AGNs, including unabsorbed and absorbed AGNs taken from Ichikawa et al. and Garcia-Bernete et al. This is the largest sample whose X-ray and infrared spectra are analyzed by the clumpy torus models XCLUMPY and CLUMPY, 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. based on a statistical analysis. We confirm the results by Tanimoto et al. that (1) the torus angular widths determined by the infrared data are larger than those by the X-ray data and (2) the ratios of hydrogen column density to V-band extinction (NH/AV) along the line of sight in obscured AGNs are similar to the Galactic value, on average. Unobscured AGNs show apparently smaller line-of-sight NH/AV 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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Active galactic nuclei - Astrophysical black holes - High energy astrophysics - Seyfert galaxies - Supermassive black holes - X-ray active galactic nuclei

Simbad objects: 38

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