论文标题
Seyfert Galaxy NGC 3786中的中红外耀斑：由潮汐破坏事件触发的更换外观事件？
A Mid-infrared Flare in the Seyfert Galaxy NGC 3786: A Changing-look Event Triggered by an Obscured Tidal Disruption Event?
论文作者
论文摘要
我们报告了Seyfert 1.8 NGC 3786中的出色中海耀斑。在来自广阔的红外调查Explorer的多上两口数据中，NGC 3786的核中红外亮度似乎差不多$ 0.5--0.8 $ 2020 MAG左右。但是，没有证据表明ZWICKY瞬态设施的光条的相应光曲线显着变化。这意味着耀斑可能已经被核尘掩盖了。通过耀斑之后的双子座 - 北方的随访光谱观察，我们发现$ {\ rm pa}α$和$ {\ rm pa}β$新出现的宽发射线新出现，而广泛的$ {\ rm h}β$发射在五个后五个后期的光彩谱中被略微检测到。此外，相对于狭窄的发射线，它们的中心波长是系统的红移，最高为900 km s $^{ - 1} $。这表明耀斑与从1.8型到1型的变化现象有关。根据这些发现，我们认为耀斑可能源于掩盖的潮汐破坏事件，尽管增生率的极端变化可能无法完全排除。
We report an exceptional mid-infrared flare in the Seyfert 1.8 NGC 3786. In the multi-epoch data from the Wide-field Infrared Survey Explorer, the nuclear mid-infrared brightness of NGC 3786 appears to vary substantially up to $0.5-0.8$ mag around mid-2020. However, there is no evidence of significant variation in the corresponding light curve of the optical band from the Zwicky Transient Facility. This implies that the flare may have been heavily obscured by nuclear dust. Through follow-up spectroscopic observations with Gemini-North after the flare, we find that broad emission lines in ${\rm Pa}α$ and ${\rm Pa}β$ newly appear, while the broad ${\rm H}β$ emission is marginally detected in the post-flare spectrum. In addition, their central wavelengths are systematically redshifted up to 900 km s$^{-1}$ with respect to the narrow emission lines. This reveals that the flare is associated with the changing-look phenomenon from type 1.8 to type 1. Based on these findings, we argue that the flare is likely to originate from an obscured tidal disruption event, although extreme variation in the accretion rate may not be ruled out completely.
