正如JVLA、IRAM、PdBI和Herschel所揭示的那样，富气体的合并和反馈在恒星爆发的射电星系中无处不在
Gas-rich mergers and feedback are ubiqitous amongst starbursting radio galaxies, as revealed by JVLA, IRAM PdBI and Herschel
摘要：
本文报道了两个z ~ 3-3.5的前红外发光射电星系6C 1909 +72和B3 J2330 +3927的新的、灵敏的观测结果，它们是用Karl Jansky VLA在12 CO J=1-0和用Herschel在100- 500 μ m波段观测到的，同时还报道了IRAM PdBI的新的和存档的12 CO J=4-3观测结果。我们引入了一个新的颜色-颜色诊断图来约束我们目标场中几个遥远的尘埃星系的红移。6C 1909 +72附近的一个明亮的SMG可能与活动星系核共享相同的节点或暗条，但在CO中没有检测到它，尽管它的速度约为20，000 km/s。同样在6C 1909 +72场中，一个跨越约500 kpc的大型红色尘埃特征与射电喷流对齐。我们提出了几个过程，其中富含金属的材料可能已被运输，有利于准直外流让人想起射流导向的金属富集在当地集群环境。我们的干涉成像揭示了B3 J2330 +3927的一个富含气体的伴星;实际上，除了八个z >~ 2的射电星系中的一个之外，在CO中检测到的（或同伴）提供了一些证据，表明在高红移的射电大声AGN中的星暴活动是由两个或更多个富含气体的系统的相互作用驱动的，其中已经形成了大量的恒星，而不是通过宇宙网中的冷气体的稳定吸积。我们发现，在射电大声活动星系核宿主星系的CO Tb比显着高于那些看到同样激烈的恒星爆发活动星系核活动不太明显。我们最极端的例子，其中L '（CO 4 -3）/L'（CO 1 -0）> 2.7，提供了证据表明，大量的能量通过X射线和/或机械辐射迅速沉积到分子气体中。（“类星体模式”）来自活动星系核的反馈，导致全球高度的湍流和12 CO中的低光学深度。反馈可能导致恒星形成的停止，其时间尺度与喷流活动相当，<~ 1000万年。
英文摘要：
We report new, sensitive observations of two z ~ 3-3.5 FIR-luminous radio galaxies, 6C1909+72 and B3J2330+3927, in 12CO J=1-0 with the Karl Jansky VLA and at 100-500um using Herschel, alongside new and archival 12CO J=4-3 observations from IRAM PdBI. We introduce a new colour-colour diagnostic plot to constrain the redshifts of several distant, dusty galaxies in our target fields. A bright SMG near 6C1909+72 likely shares the same node or filament as the signpost AGN, but it is not detected in CO despite ~20,000 km/s of velocity coverage. Also in the 6C1909+72 field, a large, red dust feature spanning ~500 kpc is aligned with the radio jet. We suggest several processes by which metal-rich material may have been transported, favouring a collimated outflow reminiscent of the jet-oriented metal enrichment seen in local cluster environments. Our interferometric imaging reveals a gas-rich companion to B3J2330+3927; indeed, all bar one of the eight z >~ 2 radio galaxies (or companions) detected in CO provide some evidence that starburst activity in radio-loud AGN at high redshift is driven by the interaction of two or more gas-rich systems in which a significant mass of stars has already formed, rather than via steady accretion of cold gas from the cosmic web. We find that the CO Tb ratios in radio-loud AGN host galaxies are significantly higher than those seen in similarly intense starbursts where AGN activity is less pronounced. Our most extreme example, where L'(CO4-3)/L'(CO1-0) > 2.7, provides evidence that significant energy is being deposited rapidly into the molecular gas via X-rays and/or mechanical (`quasar-mode') feedback from the AGN, leading to a high degree of turbulence globally and a low optical depth in 12CO - feedback that may lead to the cessation of star formation on a timescale commensurate with that of the jet activity, <~10 Myr.
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