Astrophys. J., 772, 38 (2013/July-3)
Suzaku view of the Swift/BAT active galactic nuclei. V. Torus structure of two luminous radio-loud active galactic nuclei (3C 206 and PKS 0707-35).
TAZAKI F., UEDA Y., TERASHIMA Y., MUSHOTZKY R.F. and TOMBESI F.
Abstract (from CDS):
We present the results from broadband X-ray spectral analysis of 3C 206 and PKS 0707-35 with Suzaku and Swift/BAT, two of the most luminous unobscured and obscured radio-loud active galactic nuclei (AGNs) with hard X-ray luminosities of 1045.5 erg/s and 1044.9 erg/s (14-195 keV), respectively. Based on the radio core luminosity, we estimate that the X-ray spectrum of 3C 206 contains a significant (∼60% in the 14-195 keV band) contribution from the jet, while it is negligible in PKS 0707-35. We can successfully model the spectra with the jet component (for 3C 206), the transmitted emission, and two reflection components from the torus and the accretion disk. The reflection strengths from the torus are found to be Rtorus(≡ Ω/2π) = 0.29±0.18 and 0.41±0.18 for 3C 206 and PKS 0707-35, respectively, which are smaller than those in typical Seyfert galaxies. Utilizing the torus model by Ikeda et al., we quantify the relation between the half-opening angle of a torus (θoa) and the equivalent width of an iron-K line. The observed equivalent width of 3C 206, < 71 eV, constrains the column density in the equatorial plane to NHeq <1023/cm2, or the half-opening angle to θoa> 80° if NHeq =1024/cm2 is assumed. That of PKS 0707-35, 72 ±36 eV, is consistent with NHeq ∼1023/cm2. Our results suggest that the tori in luminous radio-loud AGNs are only poorly developed. The trend is similar to that seen in radio-quiet AGNs, implying that the torus structure is not different between AGNs with jets and without jets.
galaxies: active - galaxies: individual (3C 206, PKS 0707-35) - X-rays: galaxies
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