Astrophys. J., 754, 45 (2012/July-3)
Mid- and far-infrared properties of a complete sample of local active galactic nuclei.
ICHIKAWA K., UEDA Y., TERASHIMA Y., OYABU S., GANDHI P., MATSUTA K. and NAKAGAWA T.
Abstract (from CDS):
We investigate the mid- (MIR) to far-infrared (FIR) properties of a nearly complete sample of local active galactic nuclei (AGNs) detected in the Swift/Burst Alert Telescope (BAT) all-sky hard X-ray (14-195 keV) survey, based on the cross correlation with the AKARI infrared survey catalogs complemented by those with Infrared Astronomical Satellite and Wide-field Infrared Survey Explorer. Out of 135 non-blazer AGNs in the Swift/BAT nine-month catalog, we obtain the MIR photometric data for 128 sources either in the 9, 12, 18, 22, and/or 25 µm band. We find good correlation between their hard X-ray and MIR luminosities over three orders of magnitude (42 < log λLλ(9, 18 µm) < 45), which is tighter than that with the FIR luminosities at 90 µm. This suggests that thermal emission from hot dusts irradiated by the AGN emission dominate the MIR fluxes. Both X-ray unabsorbed and absorbed AGNs follow the same correlation, implying isotropic infrared emission, as expected in clumpy dust tori rather than homogeneous ones. We find excess signals around 9 µm in the averaged infrared spectral energy distribution from heavy obscured "new type" AGNs with small scattering fractions in the X-ray spectra. This could be attributed to the polycyclic aromatic hydrocarbon emission feature, suggesting that their host galaxies have strong starburst activities.
galaxies: active - galaxies: nuclei - infrared: galaxies
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<Available at CDS (J/ApJ/754/45): table1.dat>
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