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arXiv 1908.09229astro-ph.GA
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附近射电星系II中的AGN燃料/反馈循环。分子气体动力学

The AGN fuelling/feedback cycle in nearby radio galaxies II. Kinematics of the molecular gas

Ilaria Ruffa, Timothy A. Davis, Isabella Prandoni, Robert A. Laing, Rosita Paladino, Paola Parma, Hans de Ruiter, Viviana Casasola, Martin Bureau, Joshua Warren

摘要:

这是探索11个附近低激发射电星系(LERG)样本的多组分(恒星,温暖和寒冷的气体和射电喷流)特性的系列论文的第二篇,目的是更好地了解这些物体中的活动星系核燃料/反馈周期。本文利用ALMA研究了在$^{12}$ CO(2-1)中探测到的六个样本星系的分子气体运动学。在所有情况下,我们的模型表明,在所观察到的(子)千秒差距的CO光盘的气体的大部分是有序旋转。然而,低水平的扭曲是普遍存在的,表明分子气体没有完全放松到宿主星系的潜力。然而,大多数光盘只是轻微地解决了问题,使我们无法得出有力的结论。NGC 3557和NGC 3100是特例。在NGC 3557的CO速度曲线中观察到的特征使我们能够估计一个超大质量黑洞(SMBH)的质量为$(7.10\pm0.02)\times10^{8}$ M $_{\odot}$,与M $_{\rm SMBH}- σ_{*}$关系的预期一致。NGC 3100的旋转模式显示出扭曲,似乎与位置角和倾斜扭曲的存在一致。不可忽略的径向运动也被发现在该平面的CO光盘,可能与流运动相一致的螺旋图案中发现的内部区域的光盘。主导的径向运动可能是流入,支持的情况下,冷气体是有助于燃料的活动星系核。

英文摘要:

This is the second paper of a series exploring the multi-component (stars, warm and cold gas and radio jets) properties of a sample of eleven nearby low excitation radio galaxies (LERGs), with the aim of better understanding the AGN fuelling/feedback cycle in these objects. Here we present a study of the molecular gas kinematics of six sample galaxies detected in $^{12}$CO(2-1) with ALMA. In all cases, our modelling suggests that the bulk of the gas in the observed (sub-)kpc CO discs is in ordered rotation. Nevertheless, low-level distortions are ubiquitous, indicating that the molecular gas is not fully relaxed into the host galaxy potential. The majority of the discs, however, are only marginally resolved, preventing us from drawing strong conclusions. NGC 3557 and NGC 3100 are special cases. The features observed in the CO velocity curve of NGC 3557 allow us to estimate a super-massive black hole (SMBH) mass of $(7.10\pm0.02)\times10^{8}$ M$_{\odot}$, in agreement with expectations from the M$_{\rm SMBH}- σ_{*}$ relation. The rotation pattern of NGC 3100 shows distortions that appear to be consistent with the presence of both a position angle and inclination warp. Non-negligible radial motions are also found in the plane of the CO disc, likely consistent with streaming motions associated with the spiral pattern found in the inner regions of the disc. The dominant radial motions are likely to be inflows, supporting a scenario in which the cold gas is contributing to the fuelling of the AGN.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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