SIMBAD references

2019ApJ...876...96Y - Astrophys. J., 876, 96-96 (2019/May-2)

Luminosity ratio between [O IV] 25.89 µm line and nuclear continuum 12 µm as a diagnostic for "buried" AGNs.

YAMADA S., UEDA Y., TANIMOTO A., KAWAMURO T., IMANISHI M. and TOBA Y.

Abstract (from CDS):

We propose new diagnostics that utilize the [O IV] 25.89 µm and nuclear (subarcsecond scale) 12 µm luminosity ratios for identifying whether an active galactic nucleus (AGN) is deeply "buried" in their surrounding materials. Utilizing a sample of 16 absorbed AGNs at redshifts lower than 0.03 in the Swift/BAT catalog observed with Suzaku, we find that AGNs with small scattering fractions (<0.5%) tend to show weaker [O IV]-to-12 µm luminosity ratios than the average of Seyfert 2 galaxies. This suggests that this ratio is a good indicator for identifying buried AGNs. Then, we apply this criterion to 23 local luminous and ultraluminous infrared galaxies (U/LIRGs) in various merger stages hosting AGNs. We find that AGNs in most mid- to late-stage mergers are buried, while those in earlier-stage ones (including nonmerger) are not. This result suggests that the fraction of buried AGNs in U/LIRGs increases as the galaxy-galaxy interaction becomes more significant.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: nuclei - infrared: galaxies - X-rays: galaxies

Simbad objects: 43

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2021.06.20-06:16:55

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