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Warm Molecular Gas in the Central Parsecs of the Buried Nucleus of NGC 4418 Traced with the Fundamental CO Ro-vibrational Absorptions
Youichi Ohyama, Shusuke Onishi, Takao Nakagawa +5
We investigated the inner buried nucleus of a nearby luminous infrared galaxy NGC 4418 using high-resolution spectroscopy of fundamental carbon monoxide (CO) ro-vibrational absorpt…
Probing dynamics and thermal properties inside molecular tori with CO rovibrational absorption lines
Kosei Matsumoto, Takao Nakagawa, Keiichi Wada +5
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 t…
Extremely Buried Nucleus of IRAS 172080014 Observed at Sub-Millimeter and Near-Infrared Wavelengths
Shunsuke Baba, Masatoshi Imanishi, Takuma Izumi +6
The ultraluminous infrared galaxy IRAS 172080014 is a late-stage merger that hosts a buried active galactic nucleus (AGN). To investigate its nuclear structure, we performed hig…
Anomalous Hydrogen Recombination-Line Ratios in Ultraluminous Infrared Galaxies
Kenichi Yano, Shunsuke Baba, Takao Nakagawa +5
We conducted systematic observations of the H I Br (4.05 m) and Br (2.63 m) lines in 52 nearby () ultraluminous infrared galaxies (ULIRGs) with AKARI. Among 33 U…
Study of the Inner Structure of the Molecular Torus in IRAS 08572+3915 NW with Velocity Decomposition of CO Rovibrational Absorption Lines
Shusuke Onishi, Takao Nakagawa, Shunsuke Baba +6
Understanding the inner structure of the clumpy molecular torus surrounding the active galactic nucleus is essential in revealing the forming mechanism. However, spatially resolvin…
A systematic study of ULIRGs using near-infrared absorption bands reveals a strong UV environment in their star-forming regions
Ryosuke Doi, Takao Nakagawa, Naoki Isobe +3
We present a systematic study of the 3.0 um H2O ice and the 3.4 um aliphatic carbon absorption features toward 48 local ultraluminous infrared galaxies (ULIRGs) using spectra obtai…