发表机构
Central University of Himachal Pradesh; UM-DAE Centre for Excellence in Basic Sciences; Peking University（喜马偕尔中央大学; UM-DAE基础科学卓越中心; 北京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用ZTF数据构建62个中等质量黑洞驱动的低质量活动星系核样本，经F统计量检验未发现显著夜内光变，其结果与此前小规模定向观测样本的探测结论存在差异。
AI 中文摘要
利用兹威基瞬变巡天（ZTF）的丰富档案数据库，我们研究了中等质量黑洞（IMBHs）驱动的大样本低质量活动星系核（LMAGN）的夜内光变（INOV）。经过一系列合理的选择筛选后，我们构建了一个无偏且具有代表性的样本，包含62个IMBH，ZTF数据库中具备这些源的r波段夜内测光序列，共获得167个观测时段，每个时段最短持续2小时。通过对每个时段的曝光序列进行孔径测光，我们推导了目标LMAGN相对于两颗精心挑选的、与LMAGN在同一曝光序列中同时监测的非变比较星的差分光变曲线（DLCs）。对所有这些DLCs应用广泛使用的F统计量检验后，未发现任何统计上显著的INOV案例。我们结合此前另一项针对LMAGN的INOV探测报告讨论了这一结果，不过该报告的样本规模小得多且选择方式不同，是通过定向观测监测的。
英文摘要
Using the extensive archival database of the Zwicky Transient Facility (ZTF) survey, we have investigated intranight optical variability (INOV) in a large sample of low-mass active galactic nuclei (LMAGN) powered by intermediate-mass black holes (IMBHs). After applying a sequence of well-motivated selection filters, we constructed an unbiased, representative sample of 62 IMBHs for which $r$-band intranight photometric sequences are available in the ZTF database, yielding 167 sessions with a minimum duration of 2 h. By performing aperture photometry on the sequence of exposures in each session, we derived differential light curves (DLCs) of the target LMAGN relative to two carefully selected non-varying comparison stars monitored simultaneously with the LMAGN in the same exposure sequence. Application of the widely used test based on $F$-statistics to all these DLCs revealed no case of statistically significant INOV. We discuss this result for the present large sample of LMAGN in the context of an earlier report of INOV detections in another, albeit much smaller and differently selected, sample of LMAGN that had been monitored in targeted observations.
Comments14 pages, 9 figures, 2 tables. Submitted to MNRAS
