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Probing dynamics and thermal properties inside molecular tori with CO rovibrational absorption lines by Matsumoto, Kosei; Nakagawa, Takao; Wada, Keiichi; Baba, Shunsuke; Onishi, Shusuke; Uzuo, Taisei; Isobe, Naoki; Kudoh, Yuki is a scholarly article available to read on EtoBox.

What is Probing dynamics and thermal properties inside molecular tori with CO rovibrational absorption lines about?

A recent hydrodynamic model, "radiation-driven fountain model" (Wada et al. 2016), presented a dynamical picture that active galactic nuclei (AGNs) tori sustain their geometrical thickness by gas circulation around AGNs, and previous papers confirmed that this picture is consistent with multi-wavelength observations of nearby Seyfert galaxies. Recent near-infrared observations implied that CO rovibrational absorption lines ($\Delta J=\pm1$, $v=0-1$, $\lambda \sim 4.7$ $\mathrm{\mu m}$) could probe physical properties of the inside tori. However, the origin of the CO absorption lines has been under debate. In this paper, we investigate the origin of the absorption lines and conditions for detecting them by performing line radiative transfer calculations based on the radiation-driven fountain model. We find that CO rovibrational absorption lines are detected at inclination angles $\theta_\mathrm{obs} = 50-80$ $^{\circ}$. At the inclination angle $\theta_\mathrm{obs} = 77$ $^{\circ}$, we observe multi-velocity components: inflow ($v_\mathrm{LOS}=30$ $\mathrm{kms^{-1}}$), systemic ($v_\mathrm{LOS}=0 \, \mathrm{kms^{-1}}$), and outflows ($v_\mathrm{LOS}=-75,\, -95,$ and $-105$ $\mathrm{

Author

Matsumoto, Kosei; Nakagawa, Takao; Wada, Keiichi; Baba, Shunsuke; Onishi, Shusuke; Uzuo, Taisei; Isobe, Naoki; Kudoh, Yuki

Published

2022

Language

EN