论文标题
CSS100217的下降：在明显无宿主的活性银核中潮汐破坏引起的低状态
The fall of CSS100217: a tidal disruption-induced low state in an apparently hostless active galactic nucleus
论文作者
论文摘要
CSS100217是在狭窄的Seyfert 1 Galaxy中的核，快速和发光的耀斑，目前，在活动的银河系核（AGN）的变异性或潮汐破坏事件（TDE）之间，其初始解释为超新星。在本文中，我们介绍并讨论新的证据，以支持TDE或极端耀斑的情节。耀斑衰减后，银河进入长期的低光度态，比V频段中的前爆发发射的0.4幅度低0.4。我们将其归因于在积聚磁盘旋转相对于逆行轨道中恒星潮汐破坏后，在积聚磁盘中创建了一个空腔，这使得我们对火炬的偏爱解释。我们还展示了宿主星系如何显示出类似点状的，紧凑的轮廓，没有扩展成分的证据和相对较低的质量，这与z = 0.147的AGN宿主星系的期望不同。紧凑型宿主星系可能会导致TDE率提高，从而加强我们对事件的解释。
CSS100217 was a nuclear, rapid and luminous flare in a Narrow-Line Seyfert 1 galaxy, whose initial interpretation as a supernova is now debated between variability of the active galactic nucleus (AGN) or a tidal disruption event (TDE). In this paper, we present and discuss new evidence in favour of a TDE or extreme flaring episode scenario. After the decay of the flare, the galaxy entered a long-term low luminosity state, 0.4 magnitudes lower than the pre-outburst emission in the V band. We attribute this to the creation of a cavity in the accretion disk after the tidal disruption of a star in a retrograde orbit with respect to the accretion disk rotation, making a TDE our favoured interpretation of the flare. We also show how the host galaxy shows a point-like, compact profile, no evidence for an extended component and a relatively low mass, unlike what expected from an AGN host galaxy at z=0.147. A compact host galaxy may result in an increased TDE rate, strengthening our interpretation of the event.
