AI 中文总结
研究AGN对CSS射电源3C 303.1中冷气体的反馈，通过亚毫米波阵列观测，检测到连续谱发射，未检测到$^{12}$CO（J = 3 - 2）线，得出分子气体质量上限等，发现其符合AGN反馈特征。
AI 中文摘要
活动星系核（AGN）反馈在塑造星系演化中起着关键作用。数值模拟表明，从射电喷流到星际介质（ISM）的动能转移效率相对较高，这表明射电喷流在反馈中起重要作用。我们研究了AGN对致密陡谱（CSS）射电源3C 303.1中冷气体的反馈。CSS源主要是年轻的射电星系，它们在宿主星系的密集环境中演化。这个早期演化阶段可能代表了一个关键阶段，在此阶段射电源对宿主星系演化有最大影响。3C 303.1是迄今为止唯一在光学、X射线和紫外线方面与射电结构对齐的CSS源，使其成为研究喷流反馈的有趣源。我们展示了用亚毫米波阵列获得的3C 303.1的一氧化碳（$^{12}$CO）J = 3 - 2跃迁的连续谱和谱线观测结果。我们在221.1和271.2 GHz处检测到连续谱发射。我们未检测到$^{12}$CO（J = 3 - 2）线，并得出分子气体质量的上限约为$2.3×10^{9}\ \mathrm{M_\odot}$。发现气尘质量（G/D）比处于典型银河系值的下限，推导的恒星形成率（SFR）适中但可能由于最近的猝灭事件而下降。因此未检测到$^{12}$CO（J = 3 - 2）、相对较低的G/D比以及适中但下降的SFR表明AGN对CO气体的激波加热和/或去除，这与在3C 303.1中观察到的AGN反馈特征一致。
英文摘要
AGN (active galactic nuclei) feedback plays a crucial role in shaping galaxy evolution. Numerical simulations show that the kinetic energy transfer efficiency from radio jets to interstellar medium (ISM) is relatively high, suggesting a significant role of radio jets in the feedback. We investigate AGN feedback on cold gas in the compact steep-spectrum (CSS) radio source 3C 303.1. CSS sources are largely young radio galaxies evolving through dense environments of their host galaxies. This early evolutionary phase likely represents a critical stage in which the radio source has maximum impact on host galaxy evolution. 3C 303.1 is the only CSS source so far showing alignment in optical, X-ray and UV with the radio structure, making it an interesting source to investigate jet-feedback. We present continuum and spectral line observations of the J=3-2 transition of carbon monoxide ($^{12}$CO) of 3C 303.1, obtained with the Submillimeter Array. We detect continuum emission at 221.1 and 271.2 GHz. We do not detect the $^{12}$CO(J=3-2) line and derive an upper limit on the molecular gas mass of $\sim 2.3 \times 10^{9}\ \mathrm{M_\odot}$. The gas to-dust mass (G/D) ratio is found to be at the lower end of typical Galactic values, and the star-formation rate (SFR) derived is moderate but declining likely due to a recent quenching event. Therefore, $^{12}$CO(J=3-2) non-detection, relatively low G/D ratio, and the moderate but declining SFR point to the shock-heating and/or removal of CO gas by AGN, consistent with the AGN feedback signatures observed in 3C 303.1.
Comments17 pages, 3 figures. Published in the Astrophysical Journal. This is the accepted manuscript version
Journal refAstrophys. J. 1006, 33 (2026)
