Remnant radio-loud AGN in the Herschel-ATLAS field

Remnant radio-loud AGN in the Herschel-ATLAS field
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赫歇尔-阿特拉斯场中残留的无线电响度活动星系核

DOI:
10.1093/mnras/sty025
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发表时间:
2018
影响因子:
4.8
通讯作者:
Mahatma V
Mahatma V
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mahatma V

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只有一小部分观测到的活动星系核(AGN)显示出与喷流相关的大规模射电发射,但这些射电响亮的AGN在星系演化模型中变得越来越重要。在确定宇宙时间内射电源的动力学和能量学时,一个关键问题是当它们的喷气机关闭时会发生什么。在过去的射电调查中,由此产生的“残留”射电活动星系核令人惊讶地回避,因此,关于处于死亡阶段的射电活动星系核数量的统计信息有限。在本文中,随着低频阵列(LOFAR)和超大型阵列的最新发展,我们能够系统地提供赫歇尔-ATLAS场中残留射电活动星系核的样本。使用一种简单的核心探测方法,我们将射电发射的活动星系核样本中残留物的比例上限限制在每 分9 ,这意味着一旦核心/喷流关闭,扩展的波瓣发射就会迅速减弱。我们还发现,我们的残留物样本具有很大范围的光谱指数(),证实了一些残留物的波瓣可能像活动源一样,在低频下具有平坦的光谱。我们认为,即使LOFAR具有前所未有的敏感性,我们的样本可能仍然只包含剩余人口中最年轻的一个。
Only a small fraction of observed active galactic nuclei (AGN) display large-scale radio emission associated with jets, yet these radio-loud AGN have become increasingly important in models of galaxy evolution. In determining the dynamics and energetics of the radio sources over cosmic time, a key question concerns what happens when their jets switch off. The resulting ‘remnant' radio-loud AGN have been surprisingly evasive in past radio surveys, and therefore statistical information on the population of radio-loud AGN in their dying phase is limited. In this paper, with the recent developments of Low-Frequency Array (LOFAR) and the Very Large Array, we are able to provide a systematically selected sample of remnant radio-loud AGN in the Herschel-ATLAS field. Using a simple core-detection method, we constrain the upper limit on the fraction of remnants in our radio-loud AGN sample to 9 per cent, implying that the extended lobe emission fades rapidly once the core/jets turn off. We also find that our remnant sample has a wide range of spectral indices (), confirming that the lobes of some remnants may possess flat spectra at low frequencies just as active sources do. We suggest that, even with the unprecedented sensitivity of LOFAR, our sample may still only contain the youngest of the remnant population.
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