J1611+4026群中的群预处理：由相互作用驱动的气体转移引发的巨量早期型星系的轻微再激活
Group Pre-processing in J1611+4026: Minor Rejuvenation of a Massive ETG fueled by Interaction-driven Gas Transfer
AI总结：
J1611+4026群中的相互作用驱动气体转移导致宿主星系的轻微再激活，揭示了低水平恒星形成机制。
摘要：
银河系群内的相互作用是银河系演化的根本驱动力，建立卫星星系的动态过程与宿主星系再激活之间的直接观测联系仍然具有挑战性。我们呈现了J1611+4026的多波段研究，这是一个独特的三重系统，其特征是一个质量大且早期型的宿主星系Component C以及两个富含气体的伴星Component A和B，目前正在其近邻环境中经历重大合并。利用深光学成像数据来自DESI-LS和光谱数据来自DESI和P200，我们使用GALIGHT进行二维形态分解，结合BAGPIPES和CIGALE的联合光谱光度合成建模，以解构成员星系的结构特性和恒星形成历史。关键的是，我们发现了一个延伸约15.15kpc的不对称潮汐尾，确认了伴星之间的持续相互作用。尽管Component C在形态和光谱上似乎处于静止状态，但我们揭示了“轻微再激活”的微妙稳健信号，其特征是显著的内部尘埃消光$E(B-V) \sim 0.53$和紫外过剩。重建的恒星形成历史表明了一次最近（约100Myr）的恒星暴发，其对总恒星质量的贡献微不足道（$f_{\rm burst} < 0.1$ per cent）。我们提出这种活动是由从相互作用伴星剥离的金属富集气体的吸积所驱动。这些结果强烈表明了群预处理，即卫星星系之间的相互作用通过气体转移在巨量宿主星系中驱动低水平的恒星形成，为密集环境中的相互作用驱动演化的定量基准提供了依据。
英文摘要：
Interactions within galaxy groups are fundamental drivers of galactic evolution, and establishing a direct observational link between the dynamical processes of satellite galaxies and the rejuvenation of massive host galaxies remains challenging. We present a multi-wavelength work of J1611+4026, a unique triple system characterised by a massive early-type host galaxy, Component C and two gas-rich companions, Components A and B, which are currently undergoing a major merger in its near environment. Utilising deep optical imaging from DESI-LS and spectroscopic data from DESI and P200, we employ 2D morphological decomposition using \textsc{GALIGHT} alongside joint spectrophotometric synthesis modelling with \textsc{BAGPIPES} and \textsc{CIGALE} to deconstruct the structural properties and star formation histories of the member galaxies. Crucially, we identify an asymmetric tidal tail extending $\sim$15.15 kpc from Component A, confirming the ongoing interaction between the companions. Although Component C appears quiescent in both morphology and spectroscopy, we reveal a subtle robust signal of ``minor rejuvenation'', characterised by significant internal dust extinction of $E(B-V) \sim 0.53$ and a UV excess. The reconstructed star formation history indicates a recent ($\sim$100 Myr) starburst that contributes a negligible fraction to the total stellar mass ($f_{\rm burst} < 0.1$ per cent). We propose that this activity is fueled by the accretion of metal-enriched gas stripped from the interacting companions. These results strongly suggest group pre-processing, where interactions between satellite galaxies drive low-level star formation in the massive host through gas transfer, providing a quantitative benchmark for interaction-driven evolution in dense environments.
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