AI 中文总结
该研究发现存在早型星系（尤其是透镜星系）周围重新组装出旋涡盘的反向演化路径，表明星系淬灭状态可逆转，为透镜星系向旋涡星系转变提供了证据。
AI 中文摘要
目前学界普遍认为，旋涡星系等晚型星系会通过星系并合与剧烈盘不稳定过程演化成椭圆星系、透镜星系等早型星系。在这种形态转变过程中，恒星形成通常会被淬灭机制抑制，而这类机制的具体性质仍是当前活跃研究的课题。本研究提供了反向演化路径的有力证据：利用积分场单元观测，我们识别出一类拥有淬灭中心核（QCCs）的旋涡星系。这些星系的恒星种群属性与动力学属性均呈现双峰分布，且在QCC边界附近的径向梯度存在突变。这些结果表明，QCCs与周围外盘形成于不同的宇宙时期，且通过不同的物理过程形成。值得注意的是，QCCs在质量-大小、质量-速度弥散标度关系，以及恒星种群统计与内部运动学方面，都与静止早型星系（尤其是透镜星系）高度相似。这些发现为“再活化”场景提供了有力支持，即旋涡盘在已存在的静止透镜星系或早型星系周围重新组装。此外，我们表明这种伴随早型向晚型外观反向形态转变的再活化现象相当普遍，这说明星系的淬灭状态并非始终是终态，在合适条件下可以逆转。
英文摘要
It is widely accepted that late-type galaxies, such as spirals, evolve into early-type systems, including elliptical and lenticular galaxies, through galaxy mergers and violent disk instability processes. Throughout this morphological transformation, star formation is typically suppressed by quenching mechanisms whose detailed nature remains the subject of active investigation. Here, we present compelling evidence for an evolutionary pathway that proceeds in the reverse direction. Using the integral field unit observations, we identify a population of spiral galaxies hosting quenched central cores (QCCs). These galaxies exhibit bimodal distributions in both their stellar population properties and their dynamical properties, along with sharp changes in radial gradients near the QCC boundary. These results indicate that the QCCs and the surrounding outer disks formed at distinct cosmic epochs and through different physical processes. Remarkably, QCCs closely resemble quiescent early-type galaxies, particularly lenticular galaxies, in their mass-size and mass-velocity dispersion scaling relations, as well as in their stellar population demographics and internal kinematics. These findings provide strong support for a rejuvenation scenario in which spiral disks are reassembled around pre-existing quiescent lenticular or early-type systems. Moreover, we show that such rejuvenation, accompanied by a reverse morphological transformation from early- to late-type appearance, is quite common. This indicates that quenching in galaxies is not invariably a terminal state and can be reversed under appropriate conditions.
Comments14 pages, 8 figures, 1 table, submitted to ApJ
