Revisit of Local X-ray Luminosity Function of Active Galactic Nuclei with the MAXI Extragalactic Survey

Abstract

We construct a new X-ray (2--10 keV) luminosity function of Compton-thin active galactic nuclei (AGNs) in the local universe, using the first MAXI/GSC source catalog surveyed in the 4--10 keV band. The sample consists of 37 non-blazar AGNs at $z=0.002-0.2$, whose identification is highly ($>97$) complete. We confirm the trend that the fraction of absorbed AGNs with $N_{\mathrm{H}}>10^{22}$ cm${}^{-2}$ rapidly decreases against luminosity ($L_{\mathrm{X}}$), from 0.73$\pm$0.25 at $L_{\mathrm{X}}=10^{42-43.5}$ erg s${}^{-1}$ to 0.12$\pm 0.09$ at $L_{\mathrm{X}}=10^{43.5-45.5}$ erg s${}^{-1}$. The obtained luminosity function is well fitted with a smoothly connected double power-law model whose indices are ${\gamma }_1=0.84$ (fixed) and ${\gamma }_2=2.0\pm 0.2$ below and above the break luminosity, $L_{\ast }=10^{43.3\pm 0.4}$ ergs s${}^{-1}$, respectively. While the result of the MAXI/GSC agrees well with that of HEAO-1 at $L_{\rm X} \gtsim 10^{43.5}$ erg s${}^{-1}$, it gives a larger number density at the lower luminosity range. Comparison between our luminosity function in the 2--10 keV band and that in the 14--195 keV band obtained from the Swift/BAT survey indicates that the averaged broad band spectra in the 2--200 keV band should depend on luminosity, approximated by $\Gamma \sim 1.7$ for $L_{\rm X} \ltsim 10^{44}$ erg s${}^{-1}$ while $\Gamma \sim 2.0$ for $L_{\rm X} \gtsim 10^{44}$ erg s${}^{-1}$. This trend is confirmed by the correlation between the luminosities in the 2--10 keV and 14--195 keV bands in our sample. We argue that there is no contradiction in the luminosity functions between above and below 10 keV once this effect is taken into account.

9 pages including 6 figures and 2 tables, accepted for publication in PASJ; figure 4 and related numbers are updated to reflect the flux error in Sazonov & Revnivtsev (2004)

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