利用SKA追踪富分子气体星系中的气体外流
Tracing gas outflows in molecular gas-rich galaxies with the SKA
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中文总结 AI 辅助
该研究探讨利用SKA 1结合分子线与射电连续谱观测，量化富分子气体射电星系的多相气体流与反馈能量学，实现AGN驱动反馈的种群层面研究，为理解射电喷流调控冷星际介质及恒星形成提供新框架。
中文摘要 AI 辅助
具有强大射电喷流的活动星系核（AGN）通过调节为恒星形成提供燃料的冷气体库，在星系演化中发挥关键作用。喷流驱动的反馈可加热、压缩或抛射出原子与分子气体，从而重塑星际介质并改变恒星形成效率。然而，AGN活动与多相星际介质之间的物理耦合仍未得到充分约束，尤其在射电噪系统中，这类系统中机械反馈与多相外流被认为占据主导。SKA将通过对H I发射与吸收的高灵敏度观测，以及SKA 1频率范围内选定的低频分子跃迁（包括OH、H₂CO、CH₃OH，以及高红移下稀有明亮系统中的CO、HCN和HCO⁺的低J跃迁）的探测，推动对AGN宿主星系冷气体的研究进展。结合射电连续谱测量，这些示踪剂将为气体质量、运动学、湍流以及流入/外流特征提供直接约束，从而实现对AGN环境中反馈调控的冷气体库的详细研究。本章中，我们探讨SKA 1对中性氢的观测，辅以分子线与射电连续谱研究，如何用于量化富分子气体射电星系中的多相气体流与反馈能量学。SKA巡天将实现AGN驱动反馈的种群层面研究，为理解射电喷流如何在宇宙时间尺度上调控冷星际介质与恒星形成提供新框架。
英文摘要
Active galactic nuclei with powerful radio jets play a key role in galaxy evolution through their ability to regulate the cold gas reservoirs that fuel star formation. Jet-driven feedback can heat, compress, or expel atomic and molecular gas, thereby reshaping the interstellar medium and altering star formation efficiency. However, the physical coupling between AGN activity and the multi-phase interstellar medium remains poorly constrained, particularly in radio-loud systems where mechanical feedback and multiphase outflows are expected to dominate. SKA will provide major advances in the study of cold gas in AGN host galaxies through sensitive observations of H~{\sc i} emission and absorption, together with access to selected low-frequency molecular transitions within the SKA~1 frequency range, including OH, H$_2$CO, CH$_3$OH, and, at high redshift, low-$J$ transitions of CO, HCN, and HCO$^{+}$ in rare bright systems. Combined with radio continuum measurements, these tracers will provide direct constraints on gas mass, kinematics, turbulence, and inflow/outflow signatures, enabling detailed studies of feedback-regulated cold gas reservoirs in AGN environments. In this chapter, we examine how SKA1 observations of neutral hydrogen, complemented by molecular-line and radio continuum studies, can be used to quantify multiphase gas flows and feedback energetics in molecular-gas-rich radio galaxies. SKA surveys will enable population-level studies of AGN-driven feedback, providing a new framework for understanding how radio jets regulate the cold interstellar medium and star formation across cosmic time.
