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Related papers: An X-ray spectral model for clumpy tori in active …

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We present a unification model for a clumpy obscurer in active galactic nuclei (AGN) and investigate the properties of the resulting X-ray spectrum. Our model is constructed to reproduce the column density distribution of the AGN population…

High Energy Astrophysical Phenomena · Physics 2019-09-04 Johannes Buchner , Murray Brightman , Kirpal Nandra , Robert Nikutta , Franz E. Bauer

We construct an X-ray spectral model from the clumpy torus in an active galactic nucleus (AGN), designated as "XCLUMPY", utilizing the Monte Carlo simulation for Astrophysics and Cosmology framework (MONACO: Odaka et al. 2011, 2016). The…

High Energy Astrophysical Phenomena · Physics 2020-01-08 Atsushi Tanimoto , Yoshihiro Ueda , Hirokazu Odaka , Toshihiro Kawaguchi , Yasushi Fukazawa , Taiki Kawamuro

We construct an X-ray spectral model of reprocessing by a torus in an active galactic nucleus (AGN) with a Monte Carlo simulation framework MONACO. Two torus geometries of smooth and clumpy cases are considered and compared. In order to…

High Energy Astrophysical Phenomena · Physics 2016-03-09 Shun'ya Furui , Yasushi Fukazawa , Hirokazu Odaka , Toshihiro Kawaguchi , Masanori Ohno , Kazuma Hayashi

The location of the obscuring "torus" in an active galactic nucleus (AGN) is still an unresolved issue. The line widths of X-ray fluorescence lines originated from the torus, particularly Fe K$\alpha$, carry key information on the radii of…

Obscured AGNs provide an opportunity to study the material surrounding the central engine. Geometric and physical constraints on the absorber can be deduced from the reprocessed AGN emission. In particular, the obscuring gas may reprocess…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Raj Gohil , David R. Ballantyne

We construct a generic X-ray spectral model for the reflection component from the clumpy torus and dusty gas in the polar region (polar dusty gas) in an active galactic nucleus (AGN), designated as Inclusive spectral energy distribution…

High Energy Astrophysical Phenomena · Physics 2025-12-25 Kanta Fujiwara , Yoshihiro Ueda , Shoji Ogawa , Yuya Nakatani , Ryosuke Uematsu

We apply XCLUMPY, an X-ray spectral model from a clumpy torus in an active galactic nucleus (AGN), to the broadband X-ray spectra of 10 obscured AGNs observed with both Suzaku and NuSTAR. The infrared spectra of these AGNs were analyzed…

High Energy Astrophysical Phenomena · Physics 2020-07-08 Atsushi Tanimoto , Yoshihiro Ueda , Hirokazu Odaka , Shoji Ogawa , Satoshi Yamada , Toshihiro Kawaguchi , Kohei Ichikawa

The reflection spectrum of the torus around AGN is characterized by X-ray fluorescent lines, which are most prominent for type II AGN. A clumpy torus allows photons reflected from the back-side of the torus to leak through the front…

High Energy Astrophysical Phenomena · Physics 2016-04-06 Jiren Liu , Yuan Liu , Xiaobo Li , Weiwei Xu , Lijun Gou , Cheng Cheng

We apply a new X-ray clumpy torus model called XCLUMPY (Tanimoto et al. 2019), where the clump distribution is assumed to be the same as in the infrared clumpy torus model (CLUMPY) by Nenkova et al. 2008, to the broadband X-ray spectra of…

High Energy Astrophysical Phenomena · Physics 2019-05-01 Shoji Ogawa , Yoshihiro Ueda , Satoshi Yamada , Atsushi Tanimoto , Toshihiro Kawaguchi

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…

High Energy Astrophysical Phenomena · Physics 2021-01-20 Shoji Ogawa , Yoshihiro Ueda , Atsushi Tanimoto , Satoshi Yamada

Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently construct a code for the torus using Geant4,…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Yuan Liu , Xiaobo Li

An interesting feature in active galactic nuclei (AGN) accreting at low rate is the weakness of the reflection features in their X-ray spectra, which can result from the gradual disappearance of the torus with decreasing accretion rates. It…

The hard X-ray emission of active galactic nuclei (AGN), and in particular, the reflection component, is shaped by the innermost and outer regions of the galactic nucleus. Our main goal is to investigate the variation of the Compton hump…

Astrophysics of Galaxies · Physics 2019-07-05 Christos Panagiotou , Roland Walter

The basic unified model of active galactic nuclei (AGN) invokes an anisotropic obscuring structure, usually referred to as a torus, to explain AGN obscuration as an angle-dependent effect. We present a new grid of X-ray spectral templates…

High Energy Astrophysical Phenomena · Physics 2018-02-21 M. Baloković , M. Brightman , F. A. Harrison , A. Comastri , C. Ricci , J. Buchner , P. Gandhi , D. Farrah , D. Stern

Numerous X-ray spectral models have been developed to model emission reprocessed by the torus of an active galactic nucleus (AGN), e.g., UXCLUMPY, CTORUS, and MYTORUS. They span a range of assumed torus geometries and morphologies-some…

High Energy Astrophysical Phenomena · Physics 2021-12-15 Tathagata Saha , Alex G. Markowitz , Johannes Buchner

According to theory, the torus of active galactic nuclei (AGN) is sustained from a wind coming off the accretion disk, and for low efficient AGN, it has been proposed that such structure disappears. However, the exact conditions for its…

In this paper, we try to explain the observed correlation between the covering factor (CF) of hot dust and the properties of active galactic nuclei (AGNs), e.g., the bolometric luminosity ($L_{\rm{bol}}$) and black hole mass…

Astrophysics of Galaxies · Physics 2015-12-09 Jian-Jian He , Yuan Liu , Shuang-Nan Zhang

Reprocessed X-ray radiation carries important information about the structure and physical characteristics of the material surrounding the supermassive black hole (SMBH) in active galactic nuclei (AGN). We report here on a newly developed…

High Energy Astrophysical Phenomena · Physics 2019-06-24 Stéphane Paltani , Claudio Ricci

The obscuration observed in active galactic nuclei (AGN) is mainly caused by dust and gas distributed in a torus-like structure surrounding the supermassive black hole (SMBH). However, properties of the obscuring torus of the AGN in X-ray…

Astrophysics of Galaxies · Physics 2021-06-09 X. Zhao , S. Marchesi , M. Ajello , D. Cole , Z. Hu , R. Silver , N. Torres-Albà

The circumnuclear material around Active Galactic Nuclei (AGN) is one of the essential components of the obscuration-based unification model. However, our understanding of the circumnuclear material in terms of its geometrical shape,…

Astrophysics of Galaxies · Physics 2023-04-27 Abhijit Kayal , Veeresh Singh , Claudio Ricci , N. P. S. Mithun , Santosh Vadawale , Gulab Dewangan , Poshak Gandhi
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