Abstract
The [C II]λ158 μm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [C II] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [C II] excess with respect to the FIR luminosity in the nearby AGN host galaxy HE 1353−1917. This galaxy is exceptional among a sample of five targets because the AGN ionization cone and radio jet directly intercept the cold galactic disk. As a consequence, a massive multiphase gas outflow on kiloparsec scales is embedded in an extended narrow-line region. Because HE 1353−1917 is distinguished by these special properties from our four bright AGN, we propose that a global [C II] excess in AGN host galaxies could be a direct signature of a multiphase AGN-driven outflow with a high mass-loading factor.
Highlights
The [C ii] 157.74 μm emission line arises from the fine-structure transition 2P3/2 → 2P1/2 of the ground state of singly ionized carbon C+
Because HE 1353−1917 is distinguished by these special properties from our four bright Active galactic nuclei (AGN), we propose that a global [C ii] excess in AGN host galaxies could be a direct signature of a multiphase AGN-driven outflow with a high mass-loading factor
Our five Close AGN Reference Survey (CARS) targets are shown as red triangles compared to the literature compilation of Herrera-Camus et al (2018a): normal star-forming and star-burst galaxies, AGN host galaxies, LINER galaxies, and high-redshift galaxies including the samples from Brisbin et al (2015) and Decarli et al (2018)
Summary
The [C ii] 157.74 μm emission line arises from the fine-structure transition 2P3/2 → 2P1/2 of the ground state of singly ionized carbon C+ (ionization potential of 11.2 eV). We report the discovery of the highest global [C ii] excess with respect to the FIR luminosity in the nearby AGN host galaxy HE 1353−1917.
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