We continue the study begun in Karasev et al. (2018) and present the results of our optical identifications of four hard X-ray sources from the INTEGRAL sky surveys. Having first improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory, we have identified their counterparts using optical and infrared sky survey data. Then, we have obtained optical spectra for the putative counterparts with the RTT-150 Russian-Turkish telescope and the AZT-33IK telescope. This has allowed the nature of the objects under study to be established. The sources IGR J11079+7106 and IGR J12171+7047 have turned out to be extragalactic in nature and be Seyfert 1 and 2 galaxies, respectively, with the second object being characterized by a large absorption column density. The source IGR J18165−3912 is most likely an intermediate polar with a very high luminosity. The fourth source, IGR J20596+4303, is a chance superposition of two objects—a Seyfert 2 galaxy and a cataclysmic variable.

中文翻译：

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根据INTEGRAL天空测量对四个硬X射线源的光学识别

我们继续从Karasev等人开始的研究。（2018），并介绍了我们从INTEGRAL天空调查中对四个硬X射线源进行光学识别的结果。首先使用Swift天文台的X射线望远镜（XRT）改善了这些物体在天空中的位置，然后使用光学和红外天空勘测数据确定了它们的对应物。然后，我们使用RTT-150俄罗斯土耳其望远镜和AZT-33IK望远镜获得了推定对应物的光谱。这样就可以确定研究对象的性质。事实证明，IGR J11079 + 7106和IGR J12171 + 7047源实际上是银河系外的，分别是塞弗特1星系和2星系，第二个物体的特征是吸收柱密度大。IGR J18165−3912源极有可能是具有很高发光度的中间极性。第四个来源是IGR J20596 + 4303，它是两个物体（塞弗2星系和一个灾变变量）的机会叠加。