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We systematically analyze the broadband (0.5--200 keV) X-ray spectra of hardX-ray ($>10$ keV) selected local low-luminosity active galactic nuclei (LLAGNs)observed with {\it Suzaku} and {\it Swift}/BAT. The sample consists of tenLLAGNs detected with {\it Swift}/BAT with intrinsic 14--195 keV luminositiessmaller than $10^{42}$ erg s$^{-1}$ available in the {\it Suzaku} archive,covering a wide range of the Eddington ratio from $10^{-5}$ to $10^{-2}$. Theoverall spectra can be reproduced with an absorbed cut-off power law, oftenaccompanied by reflection components from distant cold matter, and/oroptically-thin thermal emission from the host galaxy. In all objects,relativistic reflection components from the innermost disk are not required.Eight objects show a significant narrow iron-K$\alpha$ emission line. Comparingtheir observed equivalent widths with the predictions from the Monte-Carlobased torus model by \cite{Ike09}, we constrain the column density in theequatorial plane to be $\log N^{\rm eq}_{\rm H} > 22.7$ or the torus halfopening angle $\theta_{\rm oa} < 70^\circ$. We infer that the Eddington ratio($\lambda_{\rm Edd}$) is a key parameter that determines the torus structure ofLLAGNs: the torus becomes large at $\lambda_{\rm Edd} \gtrsim 2\times10^{-4}$,whereas at lower accretion rates it is little developed. The luminositycorrelation between the hard X-ray and mid-infrared (MIR) bands of the LLAGNsfollows the same one as for more luminous AGNs. This implies that othermechanisms than AGN-heated dust are responsible for the MIR emission in lowEddington ratio LLAGNs.

Study of Swift/BAT Selected Low-luminosity Active Galactic Nuclei Observed with Suzaku