Astrophys. J., 815, 1 (2015/December-2)
[O III] λ5007 and X-ray properties of a complete sample of hard X-ray selected AGNs in the local universe.
UEDA Y., HASHIMOTO Y., ICHIKAWA K., ISHINO Y., KNIAZEV A.Y., VAISANEN P., RICCI C., BERNEY S., GANDHI P., KOSS M., MUSHOTZKY R., TERASHIMA Y., TRAKHTENBROT B. and CRENSHAW M.
Abstract (from CDS):
We study the correlation between the [O III] λ5007 and X-ray luminosities of local active galactic nuclei (AGNs), using a complete, hard X-ray (>10 keV) selected sample in the Swift/BAT 9-month catalog. From our optical spectroscopic observations at the South African Astronomical Observatory and the literature, a catalog of [O III] λ5007 line flux for all 103 AGNs at Galactic latitudes of |b| > 15° is compiled. Significant correlations with intrinsic X-ray luminosity (LX) are found for both observed (L[OIII]) and extinction-corrected (L[OIII]cor) luminosities, separately for X-ray unabsorbed and absorbed AGNs. We obtain the regression form of L[OIII] ∝ L2–10KeV^1.18± 0.07^ and L[OIII]cor ∝ L2–10KeV^1.16± 0.09^from the whole sample. The absorbed AGNs with low (<0.5%) scattering fractions in soft X-rays show on average smaller L[OIII]/ LX and L[OIII]cor/LX ratios than the other absorbed AGNs, while those in edge-on host galaxies do not. These results suggest that a significant fraction of this population is buried in tori with small opening angles. By using these L[OIII] versus LX correlations, the X-ray luminosity function (LF) of local AGNs (including Compton-thick AGNs) in a standard population synthesis model gives much better agreement with the [O III] λ5007 LF derived from the Sloan Digital Sky Survey than previously reported. This confirms that hard X-ray observations are a very powerful tool to find AGNs with high completeness.
galaxies: active - galaxies: Seyfert - quasars: general - X-rays: galaxies
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