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X-Ray Properties of an Unbiased Hard X-Ray-detected Sample of Active Galactic Nuclei

机译:活性银河核的无偏硬X射线检测样品的X射线特性

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The Swift gamma-ray observatory's Burst Alert Telescope (BAT) has detected a sample of AGNs based solely on their hard X-ray flux (14-195 keV). In this paper we present for the first time XMM-Newton X-ray spectra for 22 BAT AGNs with no previously analyzed X-ray spectra. If our sources are a representative sample of the BAT AGNs, as we claim, our results present for the first time global X-ray properties of an unbiased toward absorption (nH 3 × 1025 cm ?2), local (z = 0.03), AGN sample. We find 9/22 low-absorption (nH 1023 cm ?2), simple power-law model sources, where 4 of these sources have a statistically significant soft component. Among these sources, we find the presence of a warm absorber statistically significant for only one Seyfert 1 source, contrasting with the ASCA results of Reynolds and George and coworkers, who find signatures of warm absorption in half or more of their Seyfert 1 samples at similar redshifts. In addition, the remaining sources (13/22) have more complex spectra, well fitted by an absorbed power law at E 2.0 keV . Five of the complex sources are classified as Compton-thick candidates. Further, we find four more sources with properties consistent with the hidden/buried AGNs reported by Ueda and coworkers. Finally, we include a comparison of the XMM-Newton EPIC spectra with available Swift X-Ray Telescope (XRT) observations. From these comparisons, we find 6/16 sources with varying column densities, 6/16 sources with varying power-law indices, and 13/16 sources with varying fluxes, over periods of hours to months. Flux and power-law index are correlated for objects where both parameters vary.
机译:斯威夫特伽玛射线天文台的爆炸警报望远镜(BAT)仅根据其硬X射线通量(14-195 keV)检测到了AGN样本。在本文中,我们首次展示了22种BAT AGN的XMM-牛顿X射线光谱,而以前没有分析过X射线光谱。如我们所称,如果我们的来源是BAT AGN的代表性样本,那么我们的结果将首次呈现无偏向吸收(nH <3×1025 cm?2),局部( = 0.03),AGN样本。我们发现9/22低吸收(nH <1023 cm?2),简单的幂律模型源,其中有4个源具有统计上显着的软成分。在这些来源中,我们发现仅存在一个Seyfert 1来源具有统计学意义的暖吸收剂,这与Reynolds和George及其同事的ASCA结果相反,他们在相似的一半或更多Seyfert 1样品中发现了暖吸收的特征红移。此外,其余的光源(13/22)具有更复杂的光谱,并通过E> 2.0 keV的吸收功率定律很好地拟合。五个复杂的来源被归类为康普顿级候选者。此外,我们发现了另外四个来源,其性质与上田及其同事报告的隐藏/埋藏的AGN一致。最后,我们将XMM-Newton EPIC光谱与可用的Swift X射线望远镜(XRT)观测结果进行了比较。从这些比较中,我们发现在数小时至数月的时间内,具有不同柱密度的6/16光源,具有不同幂律指数的6/16光源和具有不同通量的13/16光源。通量和幂律指数与两个参数均变化的对象相关。

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