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Date and Time of the Query: 2019-04-19 T03:53:25 PDT
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For refcode 2012ApJ...754...45I:
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2012ApJ...754...45I Mid- and Far-infrared Properties of a Complete Sample of Local Active Galactic Nuclei Ichikawa, Kohei; Ueda, Yoshihiro; Terashima, Yuichi; Oyabu, Shinki; Gandhi, Poshak; Matsuta, Keiko; Nakagawa, Takao Abstract. 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 micron band. We find good correlation between their hard X-ray and MIR luminosities over three orders of magnitude (42 < log lambdaL_lambda_(9, 18 micron) < 45), which is tighter than that with the FIR luminosities at 90 micron. 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 micron 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. Key words: galaxies: active, galaxies: nuclei, infrared: galaxies
Retrieve 135 NED objects in this reference.
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