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arXiv 2102.11752astro-ph.GA
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反馈工厂:在z=2的集群中检测到多个微弱的无线电射流

Feedback Factory: Multiple faint radio-jets detected in a cluster at z=2

Boris S. Kalita, Emanuele Daddi, Rosemary T. Coogan, Ivan Delvecchio, Raphael Gobat, Francesco Valentino, Veronica Strazzullo, Evangelia Tremou, David Elbaz, Ca… 展开作者

Boris S. Kalita, Emanuele Daddi, Rosemary T. Coogan, Ivan Delvecchio, Raphael Gobat, Francesco Valentino, Veronica Strazzullo, Evangelia Tremou, David Elbaz, Carlos Gómez-Guijarro, Alexis Finoguenov

摘要:

我们报告检测多个微弱的射电源,我们确定为活动星系核喷流,在CLJ 1449 +0856在z=2使用3 GHz的VLA观测。我们研究了在高红移下基于射电喷流的动力学反馈效应,这在解释观测到的低红移团簇ICM的热力学性质中是至关重要的。我们调查这种相互作用的时代具有高水平的活动星系核活动和过渡阶段的ICM方面的残余冷气体吸积的可能性。我们从6个检测到的喷流中测量出总流量为$\rm 30.6 \pm 3.3~μJy$。其功率贡献估计为$1.2 ~(\pm 0.6)~ \times 10^{44} ~\rm ergs~ s^{-1}$,尽管该值可能高达$4.7 ~ \times 10^{44} ~\rm ergs~ s^{-1}$。这是一个因素$\sim 0.25 - 1.0$先前估计的瞬时能量注入到ICM的CLJ 1449 +0856从活动星系核流出和恒星形成,已经被发现是足够的全球抵消冷却流在集群核心。与已经探测到的恒星形成丰度一致,这种反馈模式分布在多个地点,与在低红移时观察到的单一中心源相反,指向气体吸积到星团中心。这也表明了一个“稳定状态”的集群具有非冷核心一样的行为。最后,我们还研究了在集群核心内的星系的已知样本的TIR无线电光度比,并发现,密集的环境没有任何严重的后果,遵守星系的IR无线电相关。

英文摘要:

We report the detection of multiple faint radio sources, that we identify as AGN-jets, within CLJ1449+0856 at z=2 using 3 GHz VLA observations. We study the effects of radio-jet based kinetic feedback at high redshifts, which has been found to be crucial in low redshift clusters to explain the observed thermodynamic properties of their ICM. We investigate this interaction at an epoch featuring high levels of AGN activity and a transitional phase of ICM in regards to the likelihood of residual cold-gas accretion. We measure a total flux of $\rm 30.6 \pm 3.3~μJy$ from the 6 detected jets. Their power contribution is estimated to be $1.2 ~(\pm 0.6)~ \times 10^{44} ~\rm ergs~ s^{-1}$, although this value could be up to $4.7 ~ \times 10^{44} ~\rm ergs~ s^{-1}$. This is a factor $\sim 0.25 - 1.0$ of the previously estimated instantaneous energy injection into the ICM of CLJ1449+0856 from AGN outflows and star formation, that have already been found to be sufficient in globally offsetting the cooling flows in the cluster core. In line with the already detected abundance of star formation, this mode of feedback being distributed over multiple sites, contrary to a single central source observed at low redshifts, points to accretion of gas into the cluster centre. This also suggests a 'steady state' of the cluster featuring non cool-core like behaviour. Finally, we also examine the TIR-radio luminosity ratio for the known sample of galaxies within the cluster core and find that dense environments do not have any serious consequence on the compliance of galaxies to the IR-radio correlation.

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