AI 中文总结
研究VCC 1249矮星系中气体被严重剥离现象，利用JCMT的CO(2 - 1)观测，在剥离的HI尾三个区域获边缘CO探测结果，未在恒星盘发现CO发射，为气体去除机制与星系相变提供观测联系。
AI 中文摘要
我们首次给出了矮星系VCC 1249中分子气体和氢碘气体被严重剥离的观测线索。这种极端剥离事件被认为是由潮汐相互作用和冲压压力的综合作用驱动的。利用詹姆斯·克拉克·麦克斯韦望远镜（JCMT）的深度一氧化碳（2 - 1）观测，我们在剥离的氢碘尾中的三个区域获得了边缘一氧化碳探测结果，分子质量约为10⁵至10⁶太阳质量，与巨分子云的典型质量相当。相比之下，我们在VCC 1249的恒星盘中未发现一氧化碳发射。这表明冷气体被严重剥离，这可能导致了该星系恒星形成的突然停止。这将VCC 1249确定为一个独特的实验室，用于见证矮星系由环境驱动的从恒星形成到静止系统的快速淬火。我们的发现为气体去除机制与星系团矮星系从恒星形成到静止系统的剧烈相变之间提供了关键的观测联系。
英文摘要
We present the first observational hints of the severe removal of both molecular and HI gas from the dwarf galaxy VCC 1249. This extreme stripping event is thought to be driven by the combined effects of tidal interaction and ram pressure. Using deep CO (2$-$1) observations from the James Clerk Maxwell Telescope (JCMT), we obtained marginal CO detections in three regions within the stripped HI tail, with molecular masses of $\sim$10$^{5}$ to 10$^{6}$$M_{\odot}$, comparable to typical masses of giant molecular clouds. In contrast, we did not find CO emission within the stellar disk of VCC 1249. This indicates the severe removal of cold gas, which likely caused the sudden cessation of star formation in the galaxy. This identifies VCC 1249 as a unique laboratory for witnessing the rapid, environmentally-driven quenching of a dwarf galaxy. Our findings provide a critical observational link between gas removal mechanisms and the dramatic phase transition of cluster dwarfs from star-forming to quiescent systems.
Comments9 pages, 3 figures, 2 tables, accepted for publication in ApJL
