NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-20 T23:34:05 PDT
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For refcode 2006ApJ...652..126B:
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2006ApJ...652..126B The Hard X-Ray 20 -- 40 keV AGN Luminosity Function V. Beckmann, S. Soldi, C. R. Shrader, N. Gehrels, and N. Produit Abstract. We have compiled a complete extragalactic sample based on ~25,000 deg^2^ to a limiting flux of 3x10^-11^ergscm^-2^s^-1^ (~7000 deg^2^ to a flux limit of 10^-11^ergscm^-2^s^-1^) in the 20 -- 40 keV band with INTEGRAL. We have constructed a detailed exposure map to compensate for effects of nonuniform exposure. The flux-number relation is best described by a power law with a slope of {alpha}=1.66+/-0.11. The integration of the cumulative flux per unit area leads to f_20 -- 40keV_=2.6x10^-10^ergscm^-2^s^-1^sr^-1^, which is about 1% of the known 20 -- 40 keV X-ray background. We present the first luminosity function of AGNs in the 20 -- 40 keV energy range, based on 38 extragalactic objects detected by the imager IBIS-ISGRI on board INTEGRAL. The luminosity function shows a smoothly connected double -- power-law form with an index of {gamma}_1_=0.8 below and {gamma}_2_=2.1 above the turnover luminosity of L_*_=2.4x10^43^ergs s^-1^. The emissivity of all INTEGRAL AGNs per unit volume is W_20 -- 40keV_(>10^41^ergs s^-1^)=2.8x10^38^ergs s^-1^h^3^_70_Mpc^-3^. These results are consistent with those derived in the 2 -- 20 keV energy band and do not show a significant contribution by Compton-thick objects. Because the sample used in this study is truly local (z^dot^=0.022), only limited conclusions can be drawn for the evolution of AGNs in this energy band. Key words: Galaxies: Active, Galaxies: Seyfert, Gamma Rays: Observations, Surveys, X-Rays: Galaxies
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