AI 中文总结
研究赛弗特2型星系核在Ks波段地基自适应光学成像与HST在短波长成像的优势，用GALFIT二维建模及反锐化掩膜技术分析，发现核恒星环发生率高，其特征与非活动星系相似，该结果值得进一步研究。
AI 中文摘要
对活动星系核（AGN）在亚千秒差距尺度上进行高分辨率成像对于研究其物质供应至关重要。近红外（NIR）观测尤为重要，因为它能将尘埃吸收降至最低。然而，推断出的核形态可能取决于分析图像的方法。我们评估了在Ks波段对赛弗特2型星系核进行地基自适应光学观测是否比哈勃太空望远镜（HST）在更短波长（V和H波段）的观测更具优势。我们还研究了专用的二维分析是否比一维方法更可取。我们使用大型双筒望远镜（LBT）的自适应光学（AO）系统在Ks波段观测了18个赛弗特2型星系样本，并与存档的HST V或H波段图像进行比较。分析包括通过GALFIT进行二维建模程序以及反锐化掩膜技术。不同滤镜的结果一致，未显示出更红滤镜的明显优势。同时使用GALFIT和反锐化掩膜更可取，因为这两种方法具有互补优势。我们在样本中的18个星系中的8个（44±12%）中识别出了核恒星环。这个比例明显高于先前研究报告的比例，比最完整的核环图谱中报告的比例高出约两倍。检测到的核环的半径、大小分布和推断质量与在非活动星系中观测到的相似。低光度AGN似乎对核环的形成和演化影响很小。我们研究中核恒星环的高发生率出乎意料，值得进一步研究。这可以使用大量合适的存档HST图像进一步测试。如果得到证实，这将意味着核恒星环比以前认识到的要普遍得多。
英文摘要
High-resolution imaging of active galactic nuclei (AGNs) on subkiloparsec scales is essential for investigating their fueling. Observations in the near-infrared (NIR) are especially valuable as they minimize the absorption by dust. However, the inferred nuclear morphology may depend on the method used to analyze the images. We assess whether ground-based adaptive-optics observations of the cores of Seyfert 2 galaxies in the Ks band provide advantages over HST observations at shorter wavelengths (V and H bands). We also investigate whether a dedicated 2D analysis is preferable to a 1D approach. A sample of 18 Seyfert 2 galaxies was observed with the adaptive optics (AO) system in the Ks band at the Large Binocular Telescope (LBT) and compared to archival HST V- or H-band images. The analysis included a 2D modeling procedure via GALFIT as well as an unsharp masking technique. Results from different filters are consistent, showing no clear advantage of the redder filter. Using both GALFIT and unsharp masking in tandem is preferable, as the two methods provide complementary strengths. We identified nuclear stellar rings in 8 of the 18 galaxies in our sample (44 +/- 12%). This fraction is significantly higher than reported in previous studies and about a factor of two higher than reported in the most complete atlas of nuclear rings. The radii, size distribution, and inferred masses of the detected nuclear rings are similar to those observed in non-active galaxies. Low-luminosity AGNs appear to have little impact on nuclear ring formation and evolution. The high incidence of nuclear stellar rings in our study is unexpected and warrants further investigation. This could be tested further using the large number of suitable archival HST images available. If confirmed, it would imply that nuclear stellar rings are considerably more common than previously recognized.
Journal refAstronomy & Astrophysics, 711, A169 (2026)
DOI：10.1051/0004-6361/202558474
