NuSTAR Observations of 52 Compton-thick Active Galactic Nuclei Selected by the Swift/Burst Alert Telescope All-sky Hard X-Ray Survey
NuSTAR Observations of 52 Compton-thick Active Galactic Nuclei Selected by the Swift/Burst Alert Telescope All-sky Hard X-Ray Survey
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DOI：
10.3847/1538-4365/ac5f59
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发表时间：
2022-03
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影响因子：
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通讯作者：
A. Tanimoto;Y. Ueda;H. Odaka;S. Yamada;C. Ricci
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作者：
A. Tanimoto;Y. Ueda;H. Odaka;S. Yamada;C. Ricci
我们对52个康普顿厚（24≤logNHLOS/cm−2）活动星系核（CTAGN）候选星系进行了系统的宽带x射线光谱分析，这些候选星系核是由钱德拉、x射线多镜任务-牛顿（XMM-Newton）、斯威夫特/ x射线望远镜、Suzaku和NuSTAR观测的Swift/Burst Alert望远镜全天硬x射线巡天选择的。首次发布10个天体的XMM-Newton数据和15个天体的NuSTAR数据。我们使用团块环面的x射线光谱模型（XClumpy）来确定环面的性质。因此，由XClumpy模型获得的沿瞄准线NHLOS的氢柱密度表明，在90%的置信区间内，24个物体是康普顿薄agn， 28个物体是ctagn。主要原因是应用的环面模型不同。由XClumpy模型推断的ctagn沿赤道方向的氢柱密度NHEqu大于遮挡较少的agn。XClumpy模型得到的康普顿-薄环面覆盖因子c22与Ricci等人在低Eddington比（logREdd≤- 1.0）条件下的c22一致，而在高Eddington比（- 1.0≤logREdd）条件下的c22大于Ricci等人。XClumpy模型得到的康普顿厚环面覆盖因子c24的平均值为36−4+ 4%。基于所有agn本质上具有相同环面结构的假设，该值大于Ricci等人的（C24−4+ 4%）。这些结果表明，ctagn的结构可能与较少遮挡的agn具有本质上的不同。
We present systematic broadband X-ray spectral analysis of 52 Compton-thick ( 24≤logNHLOS/cm−2 ) active galactic nucleus (CTAGN) candidates selected by the Swift/Burst Alert Telescope all-sky hard X-ray survey observed with Chandra, X-ray Multi-Mirror Mission-Newton (XMM-Newton), Swift/X-Ray Telescope, Suzaku, and NuSTAR. The XMM-Newton data of 10 objects and the NuSTAR data of 15 objects are published for the first time. We use an X-ray spectral model from a clumpy torus (XClumpy) to determine the torus properties. As a result, the hydrogen column density along the line of sight NHLOS obtained from the XClumpy model indicates that 24 objects are Compton-thin AGNs and 28 objects are CTAGNs in a 90% confidence interval. The main reason is the difference in the torus model applied. The hydrogen column density along the equatorial direction NHEqu of CTAGNs inferred from the XClumpy model is larger than that of less obscured AGNs. The Compton-thin torus covering factor C 22 obtained from the XClumpy model is consistent with that of Ricci et al. in the low Eddington ratio ( logREdd≤−1.0 ), whereas C 22 inferred from the XClumpy model is larger than that of Ricci et al. in the high Eddington ratio ( −1.0≤logREdd ). The average value of the Compton-thick torus covering factor C 24 obtained from the XClumpy model is 36−4+4 %. This value is larger than that of Ricci et al. ( C24≃27−4+4 %) based on the assumption that all AGNs have intrinsically the same torus structure. These results suggest that the structure of CTAGNs may be intrinsically different from that of less obscured AGNs.