Suzaku Observations of Active Galactic Nuclei Detected in the Swift/BAT Survey
Abstract
We present the first results of Suzaku follow-up of new AGNs detected in the Swift /BAT survey. The Suzaku spectra of {Swift J0601.9-8636} and {Swift J0138.6-4001} reveal a heavily absorbed power law component with a column density of N_ H ≃ 1023.5-24 cm-2 that dominates above 10 keV, and an intense reflection component with a solid angle ≳ 2π from a cold, optically thick medium. We find that these AGNs have an extremely small fraction of scattered light from the nucleus (≲ 0.5 indicates that they are buried in a very geometrically-thick torus with a small opening angle and/or have unusually small amount of gas responsible for scattering. Our results imply that there must be a significant number of yet unrecognized, very Compton thick AGNs in the local universe, which are difficult to detect even in the currently most sensitive optical or hard X-ray surveys.
- Publication:
-
Progress of Theoretical Physics Supplement
- Pub Date:
- 2007
- DOI:
- 10.1143/PTPS.169.295
- Bibcode:
- 2007PThPS.169..295U