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Circumnuclear Multi-phase Gas in Circinus Galaxy IV: Absorption Owing to High-J CO Rotational Transitions

We studied the absorption features of CO lines against the continuum originating from the heated dust in the obscuring tori around active galactic nuclei (AGNs). We investigated the formation of absorption lines corresponding to the CO rotational transitions using three-dimensional non-LTE line tran...

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Published in:The Astrophysical journal 2021-07, Vol.915 (2), p.89
Main Authors: Uzuo, Taisei, Wada, Keiichi, Izumi, Takuma, Baba, Shunsuke, Matsumoto, Kosei, Kudoh, Yuki
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cited_by cdi_FETCH-LOGICAL-c445t-7470bdfe4a3949a06cf3d4e22d49bd78ad497bb14bf8d3729db158eab71928c13
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description We studied the absorption features of CO lines against the continuum originating from the heated dust in the obscuring tori around active galactic nuclei (AGNs). We investigated the formation of absorption lines corresponding to the CO rotational transitions using three-dimensional non-LTE line transfer simulations considering the dust thermal emission. As in Papers I–III of this series, we performed post-processed radiative transfer calculations using the “radiation-driven fountain model” (Wada et al. 2016), which yields a geometrically thick obscuring structure around the nucleus. This model is consistent with the spectral energy distribution of the nearest type-2 Seyfert galaxy, the Circinus galaxy. We found that the continuum-subtracted channel maps of J = 4−3 and higher transitions show absorption regions along the disk midplane for an edge-on viewing angle. The spectra consist of multiple absorption and emission features, reflecting the internal inhomogeneous and turbulent structure of the torus. The deepest absorption feature is caused by the gas on the near side of the torus between r = 10 and 15 pc, which is located in front of the AGN-heated dust inside r ≃ 5 pc. We also found that a spatial resolution of 0.5–1.0 pc is necessary to resolve the absorption features. Moreover, the inclination angle must be close to the edge-on angle (i.e., ≳85°) to observe the absorption features. The findings of the present study imply that combining our radiation-hydrodynamic model with high-resolution observations of CO (7–6) by ALMA can provide new information about the internal structure of the molecular tori in nearby AGNs.
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subjects Absorption
Active galactic nuclei
Active galaxies
Astrophysics
Carbon monoxide
Cosmic dust
Dust
Emission spectra
Galaxies
Galaxy distribution
Hydrodynamic models
Inclination angle
Molecular structure
Radiation
Radiative transfer
Radiative transfer calculations
Radio astrometry
Seyfert galaxies
Spatial resolution
Spectral energy distribution
Stars & galaxies
Thermal emission
Toruses
title Circumnuclear Multi-phase Gas in Circinus Galaxy IV: Absorption Owing to High-J CO Rotational Transitions
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