论文标题
MOMO V. Effelsberg，《大型和超级二进制黑洞候选OJ 287》的Swift和Fermi研究
MOMO V. Effelsberg, Swift and Fermi study of the blazar and supermassive binary black hole candidate OJ 287 in a period of high activity
论文作者
论文摘要
我们报告了正在进行的项目MOMO（多波伦长度观测和OJ 287的建模）的结果。在序列的最新出版物中，我们将2019年至2022.04之间的Swift UVOT-XRT和Effelsberg无线电数据（2.6-44 GHz）与Fermi Satellite的公共SMA数据和伽马射线数据结合在一起。观察时期覆盖了从无线电到X射线的高活动状态的OJ 287。该时期还涵盖了OJ 287的二元超级黑洞（SMBH）模型所预测的两个重大事件。光谱和时机分析明确建立：2021年12月在12月，一个新的UV光学最低状态在一个时期，该时期预计中学SMBH可预测围绕主要SMBH的磁盘；与2017年以前的时期相比，总体低水平的伽马射线活性；在2020--2021的中间振幅中存在显着的，持久的紫外线 - 光光耀斑事件；带有多种耀斑的无线电带中的高水平活动；特别是在2021年11月的明亮，正在进行的无线电耀斑达到顶峰，这可能与伽马射线耀斑有关，这是6年来最强的。探索了紫外线最低状态的几种解释，包括次级SMBH推出临时喷气机的可能性，但观察结果最好通过与主喷气机相关的可变性来解释。
We report results from our ongoing project MOMO (Multiwavelength Observations and Modelling of OJ 287). In this latest publication of a sequence, we combine our Swift UVOT--XRT and Effelsberg radio data (2.6-44 GHz) between 2019 and 2022.04 with public SMA data and gamma-ray data from the Fermi satellite. The observational epoch covers OJ 287 in a high state of activity from radio to X-rays. The epoch also covers two major events predicted by the binary supermassive black hole (SMBH) model of OJ 287. Spectral and timing analyses clearly establish: a new UV-optical minimum state in 2021 December at an epoch where the secondary SMBH is predicted to cross the disk surrounding the primary SMBH; an overall low level of gamma-ray activity in comparison to pre-2017 epochs; the presence of a remarkable, long-lasting UV--optical flare event of intermediate amplitude in 2020--2021; a high level of activity in the radio band with multiple flares; and particularly a bright, ongoing radio flare peaking in 2021 November that may be associated with a gamma-ray flare, the strongest in 6 years. Several explanations for the UV--optical minimum state are explored, including the possibility that a secondary SMBH launches a temporary jet, but the observations are best explained by variability associated with the main jet.
