论文标题
无线电定价中的遮挡风的多波长观察MR 2251-178
Multi-wavelength observations of the obscuring wind in the radio-quiet quasar MR 2251-178
论文作者
论文摘要
由于其短暂性的性质，很少看到掩盖从活跃的超级黑洞中驱动的风。到目前为止，在几个Seyfert 1个星系和一个广泛的吸收线射线定价类星体中，已经观察到了它们的多波长观测。 2020年末，MR 2251-178的X射线遮挡事件被捕获，该事件引发了针对此射电Quiet Quasar的多波长（NIR到X射线）观测值。在X射线频带中，晦涩的X射线频带从2020年末到2021年初导致柔软的下降。X射线晦涩的事件可能会考虑1980年和1996年的早期事件的准周期。在1980年和1996年的早期事件中。在紫外线频段，弱蓝色的森林中，我们在蓝色blue the $ $ $ $ $ $ $ al的蓝色foref temer中出现了$ $ $ al的blue the $ $。 XMM-Newton，Nustar和HST/COS观察是同时获得的，因此，瞬态X射线遮挡事件有望解释UV流出，尽管它们不一定是由风的同一部分引起的。 He {\ sc i} $ \ lambda10830 $都发现了蓝光和红移吸收功能，但没有以前的NIR Spectra可用于比较。 MR 2251-178的X射线观测特征与其他一些类型的AGN具有相似之处。但是，紫外线到NIR带中的观察特征与在其他AGN中看到的有遮挡的风的观测特征明显不同。仍然缺乏对观察性变化和遮挡风的性质的一般理解。
Obscuring winds driven away from active supermassive black holes are rarely seen due to their transient nature. They have been observed with multi-wavelength observations in a few Seyfert 1 galaxies and one broad absorption line radio-quiet quasar so far. An X-ray obscuration event in MR 2251-178 was caught in late 2020, which triggered multi-wavelength (NIR to X-ray) observations targeting this radio-quiet quasar. In the X-ray band, the obscurer leads to a flux drop in the soft X-ray band from late 2020 to early 2021. X-ray obscuration events might have a quasi-period of two decades considering earlier events in 1980 and 1996. In the UV band, a forest of weak blueshifted absorption features emerged in the blue wing of Ly$α$ $\lambda1216$ in late 2020. Our XMM-Newton, NuSTAR, and HST/COS observations are obtained simultaneously, hence, the transient X-ray obscuration event is expected to account for the UV outflow, although they are not necessarily caused by the same part of the wind. Both blueshifted and redshifted absorption features were found for He {\sc i} $\lambda10830$, but no previous NIR spectra are available for comparison. The X-ray observational features of MR 2251-178 shared similarities with some other type 1 AGNs with obscuring wind. However, observational features in the UV to NIR bands are distinctly different from those seen in other AGN with obscuring winds. A general understanding of the observational variety and the nature of obscuring wind is still lacking.
