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arXiv 0811.2658astro-ph
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射电星系中分子气体的干涉仪观测

Interferometer observations of molecular gas in radio galaxies

S. Garcia-Burillo, F. Combes, A. Usero, A. Fuente

摘要:

我们提出了在两个附近的射电星系,4C31.04和3C 293,代表两个不同阶段的演变在射电大声活动星系核(AGN)的分子气体的分布和运动学的高分辨率研究的第一个结果。这些观测使用IRAM Plateau de Bure干涉仪(PdBI)进行,以前所未有的空间分辨率(0.5”-1”)和灵敏度绘制了关键分子物种(如CO,HCN和HCO+)的发射和吸收。我们报告了对一个运动学扰动的大质量(Mgas~10^10Msun)分子/尘埃盘的探测,该盘大小约为1.4kpc,为紧凑对称天体(CSO)4C31.04的中央发动机提供燃料。我们还报告了在FRII射电星系3C 293中探测到一个大质量(Mgas~10^10Msun)规则旋转的~ 7 kpc大小的盘。对该星系的毫米连续谱源(活动星系核和喷流)探测到一个复杂系统的分子线散射。我们比较了两个源中分子盘的性质,并根据描述射电星系演化的不同理论对它们进行了讨论。

英文摘要:

We present the first results of a high-resolution study of the distribution and kinematics of molecular gas in two nearby radio galaxies, 4C31.04 and 3C293, representative of two different stages of evolution in radio-loud active galactic nuclei (AGN). These observations, conducted with the IRAM Plateau de Bure Interferometer (PdBI), map with unprecedented spatial resolution (0.5"-1") and sensitivity the emission and absorption of key molecular species such as CO, HCN and HCO+. We report on the detection of a kinematically disturbed and massive (Mgas~10^10Msun) molecular/dusty disk of ~1.4kpc-size fueling the central engine of the compact symmetric object (CSO) 4C31.04. We also report on the detection of a massive (Mgas~10^10Msun) regularly rotating ~7kpc-size disk in the FRII radio galaxy 3C293. A complex system of molecular line absorptions is detected against the mm-continuum source of this galaxy (AGN and jet). We compare the properties of the molecular disks in the two sources and discuss them in the light of the different theories describing the evolution of radio galaxies.

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