标题： AT 2023clx：在邻近恒星形成星系 NGC 3799 中发现的最暗淡和最近的光学潮汐撕裂事件 显示英文标题

标题： AT 2023clx: the Faintest and Closest Optical Tidal Disruption Event Discovered in Nearby Star-forming Galaxy NGC 3799

摘要： 我们报告在邻近的恒星形成星系NGC 3799中发现了一个微弱的光学潮汐破坏事件（TDE）。TDE的识别基于其位于星系核的位置，光变曲线随时间呈t^-5/3衰减，具有几乎恒定的黑体温度约为12,000K的蓝连续谱，以及宽(~15,000kms^-1)的巴尔末线和特征性的He~II 4686A发射线。AT 2023clx的光变曲线在g波段达到绝对星等-17.16mag，并在最大时刻具有4.56*10^42 ergs^-1的黑体总光度，使其成为迄今为止发现的最微弱的TDE。红移为0.01107，对应的光度距离为47.8Mpc，据我们所知，这也是迄今为止发现的最接近的光学TDE。此外，我们对AT 2023clx的Swift/XRT观测分析得出，在0.3--10keV范围内，3 sigma的上限非常紧，为9.53*10^39 ergs^-1。AT 2023clx以及像AT 2020wey这样的少数其他微弱TDE证明，很可能还有大量微弱的TDE尚未在更高红移处被发现，这与光度函数（LFs）的预测一致。即将进行的更深入的光学时域调查，如空间和时间遗产调查（LSST）和广域巡天望远镜（WFST）将发现更低光度的TDE，从而更精确地约束LF的低端。 显示英文摘要

摘要： We report the discovery of a faint optical tidal disruption event (TDE) in the nearby star-forming galaxy NGC 3799. Identification of the TDE is based on its position at the galaxy nucleus, a light curve declining as t^-5/3, a blue continuum with an almost constant blackbody temperature of ~12,000K, and broad (~15,000kms^-1) Balmer lines and characteristic He~II 4686A emission. The light curve of AT 2023clx peaked at an absolute magnitude of -17.16mag in the g-band and a maximum blackbody bolometric luminosity of 4.56*10^42 ergs^-1, making it the faintest TDE discovered to date. With a redshift of 0.01107 and a corresponding luminosity distance of 47.8Mpc, it is also the closest optical TDE ever discovered to our best knowledge. Furthermore, our analysis of Swift/XRT observations of AT 2023clx yields a very tight 3 sigma upper limit of 9.53*10^39 ergs^-1 in the range 0.3--10keV. AT 2023clx, together with very few other faint TDEs such as AT 2020wey, prove that there are probably a large number of faint TDEs yet to be discovered at higher redshifts, which is consistent with the prediction of luminosity functions (LFs). The upcoming deeper optical time-domain surveys, such as the Legacy Survey of Space and Time (LSST) and the Wide-Field Survey Telescope (WFST) will discover more TDEs at even lower luminosities, allowing for a more precise constraint of the low-end of the LF.