标题： MUSE对潮汐撕裂事件宿主星系的研究 显示英文标题

标题： MUSEing on the host galaxies of Tidal Disruption Events

摘要： 我们分析了20个通过ESO VLT上的MUSE积分场光谱仪观测的潮汐瓦解事件（TDE）宿主星系。 我们研究了扩展发射线区域（EELRs）的存在情况，并主要在宿主核周围亚千秒差距尺度上研究恒星种群。 在5/20个宿主中检测到EELRs，包括两个未报告的系统。 所有EELRs都位于z<0.045范围内，表明存在距离偏差，较高红移处较暗的EELRs可能被遗漏。 EELRs仅出现在合并后系统中，所有z<0.045的此类宿主都表现出EELRs。 因此，我们得出结论，TDEs与星系合并有很强的关系，样本中超过45%的合并后宿主显示出EELRs。 此外，我们使用光谱合成代码Starlight和BPASS恒星演化模型限制了中心黑洞（BHs）附近恒星质量的分布。 最年轻的核种群年龄通常为1 Gyr，恒星质量低于2.5MSun。 能够产生围绕非旋转黑洞可见TDE的种群主要由亚太阳质量恒星组成。 3/4需要更大恒星质量的TDE表现出多峰光曲线，可能暗示与高质星星体的重复部分瓦解有关。 发现的分布与使用光曲线模型推导出的恒星质量存在矛盾。 被破坏恒星的质量分离可以增强超太阳质量恒星的TDE率，但我们的研究表明，低质量TDE应该仍然丰富，甚至主导分布，除非存在阻止低质量TDE或其检测的机制。 显示英文摘要

摘要： We present an analysis of twenty tidal disruption event (TDE) host galaxies observed with the MUSE integral-field spectrograph on ESO VLT. We investigate the presence of extended emission line regions (EELRs) and study stellar populations mostly at sub-kpc scale around the host nuclei. EELRs are detected in 5/20 hosts, including two unreported systems. All EELRs are found at z<0.045, suggesting a distance bias and faint EELRs may be missed at higher redshift. EELRs only appear in post-merger systems and all such hosts at z<0.045 show them. Thus, we conclude that TDEs and galaxy mergers have a strong relation, and >45% of post-merger hosts in the sample exhibit EELRs. Furthermore, we constrained the distributions of stellar masses near the central black holes (BHs), using the spectral synthesis code Starlight and BPASS stellar evolution models. The youngest nuclear populations have typical ages of 1 Gyr and stellar masses below 2.5MSun. The populations that can produce observable TDEs around non-rotating BHs are dominated by subsolar-mass stars. 3/4 TDEs requiring larger stellar masses exhibit multi-peaked light curves, possibly implying relation to repeated partial disruptions of high-mass stars. The found distributions are in tension with the masses of the stars derived using light curve models. Mass segregation of the disrupted stars can enhance the rate of TDEs from supersolar-mass stars but our study implies that low-mass TDEs should still be abundant and even dominate the distribution, unless there is a mechanism that prohibits low-mass TDEs or their detection.