[O III]$λ5007$ and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe

Y. Ueda; Y. Hashimoto; K. Ichikawa; Y. Ishino; A. Y. Kniazev; P. Vaisanen; C. Ricci; S. Berney; P. Gandhi; M. Koss; R. Mushotzky; Y. Terashima; B. Trakhtenbrot; M. Crenshaw

doi:10.1088/0004-637X/815/1/1

paper

[O III] $λ 5007$ and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe

arXiv:1510.03153 · doi:10.1088/0004-637X/815/1/1

Abstract

We study the correlation between the [O III] $λ 5007$ 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] $λ 5007$ line flux for all 103 AGNs at Galactic latitudes of $∣ b ∣ > 1 5^{\circ}$ is complied. Significant correlations with intrinsic X-ray luminosity ( $L_{X}$ ) are found both for observed ( $L_{[O III]}$ ) and extinction-corrected ( $L_{[O III]}^{cor}$ ) luminosities, separately for X-ray unabsorbed and absorbed AGNs. We obtain the regression form of $L_{[O III]}$ $\propto L_{2 - 10 keV}^{1.18 \pm 0.07}$ and $L_{[O III]}^{cor}$ $\propto L_{2 - 10 keV}^{1.16 \pm 0.09}$ from the whole sample. The absorbed AGNs with low ( $<$ 0.5\%) scattering fractions in soft X-rays show on average smaller $L_{[O III]} / L_{X}$ and $L_{[O III]}^{cor} / L_{X}$ 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 are buried in tori with small opening angles. By using these $L_{[O III]}$ vs. $L_{X}$ correlations, the X-ray luminosity function of local AGNs (including Compton thick AGNs) in a standard population synthesis model gives much better agreement with the [O III] $λ 5007$ luminosity function 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.

14 pages including 11 figures and 3 tables, accepted for publication in ApJ. In this manuscript, the observed 14-195 keV luminosities in Table 1 have been corrected to be exactly the same as in the original Swift/BAT 9-month catalog. Accordingly, Figures 2(a) and 3(a) and a part of Tables 2 and 3 have been updated. The changes from the previous version are small and do not affect the text

[O III] $λ 5007$ and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe

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[O III]λ5007 and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe

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[O III] $λ 5007$ and X-ray Properties of a Complete Sample of Hard X-ray Selected AGNs in the Local Universe