FIRE中的潮汐瓦解事件：揭示潮汐瓦解率的宇宙演化
TDEs on FIRE: Illuminating the Cosmic Evolution of Tidal Disruption Rates
AI总结：
利用FIRE-2宇宙学模拟计算z=1-10的星系潮汐瓦解率，发现其峰值在z~2.5，与恒星形成率和中心恒星密度强相关，并揭示卫星星系在高红移的重要贡献。
摘要：
潮汐瓦解事件在本地宇宙中已被广泛研究，但其在高红移处的普遍性仍很大程度上未被探索。利用FIRE-2宇宙学zoom-in模拟，我们计算了$z=1-10$范围内每个星系的潮汐瓦解率（TDR），涵盖了从IMBHs到SMBHs的黑洞。平均TDR从早期宇宙上升，在$z \sim 2.5$附近达到峰值约$4 \times 10^{-4} \, \text{yr}^{-1}$，并在$z=1$时下降至约$10^{-5} \, \text{yr}^{-1}$。在所有红移下，TDR与宿主星系的恒星形成率和中心恒星密度强相关。定性上，TDR随$M_{\rm BH}$和$M_{\rm gal}$的变化趋势从高红移持续到本地宇宙，表明黑洞-星系标度关系在宇宙时标上具有相似性。卫星星系表现出相当高的TDR，其贡献比例在高红移显著增加，突显了它们探测IMBHs和早期星系组装的潜力。这项工作表明，宇宙学模拟为约束TDR的宇宙演化提供了有前景的途径，为未来与下一代观测的比较铺平了道路。
英文摘要：
Tidal disruption events have been extensively studied in the local universe, but their prevalence at high redshifts remains largely unexplored. Using the FIRE-2 cosmological zoom-in simulations, we compute the per-galaxy tidal disruption rate (TDR) over $z=1-10$, covering black holes from IMBHs to SMBHs. The averaged TDR rises from the early universe, peaks at $\sim 4 \times 10^{-4} \, \text{gal}^{-1} \text{yr}^{-1}$ near $z \sim 2.5$, and declines to $\sim 10^{-5} \, \text{gal}^{-1} \text{yr}^{-1}$ at $z=1$. The TDR correlates strongly with host galaxy star formation rate and central stellar density at all redshifts. Qualitatively, the TDR trends with the $M_{\rm BH}$ and $M_{\rm gal}$ persist from high redshift to the local universe, suggesting similar BH-galaxy scaling across cosmic time. Satellite galaxies exhibit comparably high TDRs, with their fractional contribution increasing significantly at high redshifts, highlighting their potential for probing IMBHs and early galaxy assembly. This work demonstrates that cosmological simulations offer a promising avenue for constraining the cosmic evolution of the TDR, paving the way for future comparisons with next-generation observations.
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