NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T23:44:52 PDT
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For refcode 2016ApJ...831...37K:
Retrieve 10 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2016ApJ...831...37K Study of Swift/Bat Selected Low-luminosity Active Galactic Nuclei Observed with Suzaku Kawamuro, Taiki; Ueda, Yoshihiro; Tazaki, Fumie; Terashima, Yuichi; Mushotzky, Richard Abstract. We systematically analyze the broadband (0.5-200 keV) X-ray spectra of hard X-ray (>10 keV) selected local low-luminosity active galactic nuclei (LLAGNs) observed with Suzaku and Swift/BAT. The sample consists of 10 LLAGNs detected with Swift/BAT with intrinsic 14-195 keV luminosities smaller than 10^42^ erg s^-1^ available in the Suzaku archive, covering a wide range of the Eddington ratio from 10^-5^ to 10^-2^. The overall spectra can be reproduced with an absorbed cut-off power law, often accompanied by reflection components from distant cold matter, and/or optically thin thermal emission from the host galaxy. In all of the objects, relativistic reflection components from the innermost disk are not required. Eight objects show a significant narrow iron-Kalpha emission line. Comparing their observed equivalent widths with the predictions from the Monte-Carlo-based torus model by Ikeda et al. (2009), we constrain the column density in the equatorial plane to be {log} {N}_{{H_}}^{{eq^}}\gt 22.7, or the torus half-opening angle theta_oa_ < 70^degree^. We infer that the Eddington ratio (lambda_Edd_) is a key parameter that determines the torus structure of LLAGNs: the torus becomes large at lambda_Edd_ >~ 2 x 10^-4^, whereas at lower accretion rates it is little developed. The luminosity correlation between the hard X-ray and mid-infrared (MIR) bands of the LLAGNs follows the same correlation as for more luminous AGNs. This implies that mechanisms other than AGN-heated dust are responsible for the MIR emission in low Eddington ratio LLAGNs. Key words: galaxies: active, X-rays: galaxies
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

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