The absorbed soft X-ray (<1 keV) emission from Compton thin type-II active galactic nuclei (AGNs) with neutral absorption columns in the range N _H = 10²¹⁻²³ cm⁻² may contain emission from star formation or scattered photons from the primary X-ray emission in Compton-thin circumnuclear gas extending out to ∼1 kpc, or leaky-absorbers along the line of sight allowing a part of the primary AGN emission to manifest in the soft X-rays. In a recent sample study of 20 Compton thin type-II AGN, Laha et al. detected variability in the soft X-ray spectra in 5 sources with timescales <20 years, indicating possibly that the primary AGN emission has leaked through the absorption column. I found that the sources with soft X-ray variability exhibit the lowest absorption column densities (N _H ∼ 0.7–1.3 10²² cm⁻²) in the sample.

来自康普顿薄 II 型活动星系核 (AGN) 的吸收软 X 射线 (<1 keV) 发射，中性吸收柱在N _H  = 10 ²¹⁻²³  cm ^-2范围内可能包含来自恒星形成的发射或来自康普顿薄环核气体中初级 X 射线发射的散射光子，延伸到约 1 kpc，或沿视线的泄漏吸收器允许一部分初级 AGN 发射出现在软 X 射线。在最近对 20 Compton 薄 II 型 AGN 的样本研究中，Laha 等人。检测到时间尺度 <20 年的 5 个源的软 X 射线光谱的变异性，表明主 AGN 发射可能已通过吸收柱泄漏。我发现，用软X射线的变异表现出源的最低吸收塔密度（Ñ _ħ  〜0.7-1.3 10 ²² 厘米^-2的样品中）。