Hydra-A中的冷气体动力学：旋转盘的证据
Cold gas dynamics in Hydra-A: evidence for a rotating disk
摘要：
我们提出了多频观测的射电星系Hydra-A（3C 218）位于一个巨大的，X射线发光的星系团的核心。IFU光谱用于追踪电离和热分子氢的运动学，其与~ 5 kpc旋转盘一致。检测到CO（2-1）、[CII]157 $μ$ m和[OI]63 $μ$ m的宽双峰线。我们估计盘内冷气体的质量为M $_{gas}$ = 2.3 $\pm$ 0.3 x 10 $^9$ M $_{\odot}$。这些观测表明，在冷原子和分子气体中发现的复杂谱线轮廓与旋转的气体圆盘或环有关。最后，HST的星系图像显示，这个气体盘包含大量的尘埃。大的气体质量，SFR和运动学与ICM的气体冷却水平一致。我们的结论是冷气体来源于冷却ICM气体的持续静态积累。旋转是在一个垂直于无线电喷流和ICM腔的投影方向的平面上，暗示了kpc尺度的冷却气体和物质在黑洞上的吸积之间可能存在的联系。我们讨论了这些意见的冷吸积，活动星系核反馈和冷却流模型的影响。
英文摘要：
We present multi-frequency observations of the radio galaxy Hydra-A (3C218) located in the core of a massive, X-ray luminous galaxy cluster. IFU spectroscopy is used to trace the kinematics of the ionised and warm molecular hydrogen which are consistent with a ~ 5 kpc rotating disc. Broad, double-peaked lines of CO(2-1), [CII]157 $μ$m and [OI]63 $μ$m are detected. We estimate the mass of the cold gas within the disc to be M$_{gas}$ = 2.3 $\pm$ 0.3 x 10$^9$ M$_{\odot}$. These observations demonstrate that the complex line profiles found in the cold atomic and molecular gas are related to the rotating disc or ring of gas. Finally, an HST image of the galaxy shows that this gas disc contains a substantial mass of dust. The large gas mass, SFR and kinematics are consistent with the levels of gas cooling from the ICM. We conclude that the cold gas originates from the continual quiescent accumulation of cooled ICM gas. The rotation is in a plane perpendicular to the projected orientation of the radio jets and ICM cavities hinting at a possible connection between the kpc-scale cooling gas and the accretion of material onto the black hole. We discuss the implications of these observations for models of cold accretion, AGN feedback and cooling flows.
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