2013/05/26 by Fumie Tazaki, Yoshihiro Ueda, Yuichi Terashima +3 · 22 citations
Physics and Astronomy · #Active galactic nucleus #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Galaxy #Gamma-ray bursts and supernovae #Geometry #Luminosity #Physics #Torus #Very Long Baseline Array #astro-ph.HE
paper · pdf · doi:10.1088/0004-637x/772/1/38
published in The Astrophysical Journal 772(1), 38 (IOP Publishing) · 12 pages, 8 figures, accepted for publication in the Astrophysical Journal
arxiv created 2013/05/26 · openalex publication_date 2013/07/03 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 10 45.5 erg s −1 and 10 44.9 erg s −1 (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 R torus (≡ 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 (θ oa ) 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 <10 23 cm −2 , or the half-opening angle to θ oa > 80° if =10 24 cm −2 is assumed. That of PKS 0707−35, 72 ± 36 eV, is consistent with ∼10 23 cm −2 . 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.