2018/11/06 by Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda +10 · 105 citations
Physics and Astronomy · #Active galactic nucleus #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Galaxy #Infrared #Luminosity #Luminosity function #Luminous infrared galaxy #Sky #Spectral energy distribution #Torus #astro-ph.GA #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/aaef8f
published in The Astrophysical Journal 870(1), 31 (IOP Publishing) · 21 pages, 15 figures, accepted for publication in ApJ. The full list of Table 1 is available at http://www.kusastro.kyoto-u.ac.jp/~ichikawa/Table1_MR_20181107.txt
arxiv created 2018/11/06 · openalex publication_date 2019/01/01 · arxiv updated 2019/01/09 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/06
Abstract We quantify the luminosity contribution of active galactic nuclei (AGNs) to the 12 μ m, mid-infrared (MIR; 5–38 μ m), and total IR (5–1000 μ m) emission in the local AGNs detected in the all-sky 70 month Swift /Burst Alert Telescope (BAT) ultrahard X-ray survey. We decompose the IR spectral energy distributions (SEDs) of 587 objects into the AGN and starburst components using templates for an AGN torus and a star-forming galaxy. This enables us to recover the emission from the AGN torus including the low-luminosity end, down to , which typically has significant host galaxy contamination. The sample demonstrates that the luminosity contribution of the AGN to the 12 μ m, the MIR, and the total IR bands is an increasing function of the 14–150 keV luminosity. We also find that for the most extreme cases, the IR pure-AGN emission from the torus can extend up to 90 μ m. The total IR AGN luminosity obtained through the IR SED decomposition enables us to estimate the fraction of the sky obscured by dust, i.e., the dust covering factor. We demonstrate that the median dust covering factor is always smaller than the median X-ray obscuration fraction above an AGN bolometric luminosity of . Considering that the X-ray obscuration fraction is equivalent to the covering factor coming from both the dust and gas, this indicates that an additional neutral gas component, along with the dusty torus, is responsible for the absorption of X-ray emission.