We present a systematic spectral analysis with Suzaku of six AGNs detected in the Swift /BAT hard X-ray ( 15–200 keV ) survey , Swift J0138.6–4001 , J0255.2–0011 , J0350.1–5019 , J0505.7–2348 , J0601.9–8636 , and J1628.1–5145 .
This is considered to be a representative sample of new AGNs without X-ray spectral information before the BAT survey .
We find that the 0.5–200 keV spectra of these sources can be uniformly fit with a base model consisting of heavily absorbed ( log N _ { H } > 23.5 cm ^ { -2 } ) transmitted components , scattered lights , a reflection component , and an iron-K emission line .
There are two distinct groups , three “ new type ” AGNs ( including the two sources reported by Ueda et al . 31 ) with an extremely small scattered fraction ( f _ { scat } < 0.5 \% ) and strong reflection component ( R = \Omega / 2 \pi \gtrsim 0.8 where \Omega is the solid angle of the reflector ) , and three “ classical type ” ones with f _ { scat } > 0.5 \% and R \lesssim 0.8 .
The spectral parameters suggest that the new type has an optically thick torus for Thomson scattering ( N _ { H } \sim 10 ^ { 25 } cm ^ { -2 } ) with a small opening angle \theta \sim 20 ^ { \circ } viewed in a rather face-on geometry , while the classical type has a thin torus ( N _ { H } \sim 10 ^ { 23 - 24 } cm ^ { -2 } ) with \theta \gtrsim 30 ^ { \circ } .
We infer that a significant number of new type AGNs with an edge-on view is missing in the current all-sky hard X-ray surveys .