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The warm molecular hydrogen of PKS B1718–649 - Feeding a newly born radio AGN

机译:PKS B1718–649的温暖分子氢-喂养新生的无线电AGN

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摘要

We present new SINFONI VLT observations of molecular hydrogen (H _(?2) ) in the central regions ( & 2.5 kpc) of the youngest and closest radio source PKS B1718–649. We study the distribution of the H _(?2) traced by the 1–0 S(1) ro-vibrational line, revealing a double disk structure with the kinematics of both disks characterised by rotation. An outer disk ( r & 650 pc) is aligned with other components of the galaxy (atomic hydrogen, stars, dust), while the inner disk ( r & 600 pc) is perpendicular to it and is polar with respect to the stellar distribution. However, in the innermost 75 pc, the data show the presence of H _(?2) gas redshifted with respect to the rotating inner disk ( Δ v ~ + 150 km?s ~(-1) ), which may trace gas falling into the super massive black hole associated with the central radio source. Along the same line of sight, earlier observations had shown the presence in the central regions of PKS B1718–649 of clouds of atomic hydrogen with similar unsettled kinematics. The range of velocities and mass of these unsettled clouds of H? i and H _(?2) suggest they may be actively contributing to fuelling the central newly born radio source.
机译:我们提出了最年轻和最接近的无线电源PKS B1718–649的中心区域(<2.5 kpc)中的分子氢(H _(?2))的新SINFONI VLT观测值。我们研究了由1–0 S(1)旋转振动线追踪的H _(?2)的分布,揭示了双盘结构,两个盘的运动学特征是旋转。外盘(r> 650 pc)与星系的其他组成部分(原子氢,恒星,尘埃)对齐,而内盘(r& 600 pc)垂直于星盘并且相对于恒星是极性的分配。然而,在最里面的75 pc中,数据表明存在H _(?2)气体相对于旋转的内盘(Δv〜+ 150 km?s〜(-1))红移,这可能会跟踪气体下落进入与中央无线电源相关的超大黑洞。沿着同一视线,较早的观察结果表明,在PKS B1718–649的中心区域中存在具有类似未解决的运动学的原子氢云。这些未沉降的H?云的速度和质量范围。 i和H _(?2)暗示他们可能在为中央新生无线电源加油方面做出积极贡献。

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