标题： 3C 293中的分子气体：在F-R II射电星系中首次检测到CO发射和吸收 显示英文标题

标题： Molecular Gas in 3C 293: The First Detection of CO Emission and Absorption in an F-R II Radio Galaxy

摘要： 首次检测到法纳罗夫-瑞利II类（即边缘明亮的射电形态）射电星系中的CO发射。 多波长（0.36-2.17微米）成像显示3C 293是一个盘状星系，其光学喷流或潮汐尾延伸至一个看起来像是伴星系的天体，该伴星系距离为28千秒差距，通过低表面亮度包层相连。 分子气体似乎分布在围绕一个未分辨的连续谱源旋转的不对称盘中，该连续谱源可能是活动星系核的辐射。 在CO光谱中还观测到一个窄（约60公里/秒）的吸收特征，并与连续谱源重合。 使用标准的CO转换因子，计算出的分子气体质量为1.5×10^10太阳质量，是银河系分子气体质量的几倍。 3C 293中心3千秒差距范围内的分子气体高浓度，结合多波长形态特征，支持射电活动是由富含气体的星系-星系相互作用或合并事件触发的观点。 显示英文摘要

摘要： The first detection of CO emission in a Fanaroff-Riley Class II (i.e., edge-brightened radio morphology) radio galaxy is presented. Multi- wavelength (0.36-2.17 micron) imaging of 3C 293 shows it to be a disk galaxy with an optical jet or tidal tail extending towards what appears to be a companion galaxy 28 kpc away via a low surface brightness envelope. The molecular gas appears to be distributed in an asymmetric disk rotating around an unresolved continuum source, which is presumably emission from the AGN. A narrow (approx 60 km/s) absorption feature is also observed in the CO spectrum and is coincident with the continuum source. Using the standard CO conversion factor, the molecular gas mass is calculated to be 1.5x10^10 M_sun, several times the molecular gas mass of the Milky Way. The high concentration of molecular gas within the central 3 kpc of 3C 293, combined with the multiwavelength morphological peculiarities, support the idea that the radio activity has been triggered by a gas-rich galaxy-galaxy interaction or merger event.