The life cycle of radio galaxies in the LOFAR Lockman Hole field
The life cycle of radio galaxies in the LOFAR Lockman Hole field
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LOFAR 洛克曼洞射电星系的生命周期
DOI：
10.1051/0004-6361/201936955
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发表时间：
2020
影响因子：
6.5
通讯作者：
Jurlin N
中科院分区：
文献类型：
--
作者：
Jurlin N
已知射电星系会经历活动周期，在明显的静止阶段之后，中央超大质量黑洞会重复活动。更好地了解这个周期是确定喷流对宿主星系的能量影响的关键，但对此知之甚少。我们使用Lockman Hole河外场150 MHz的深LOFAR图像，选择了158个大小> 60“的射电源在其喷流生命周期的不同阶段。使用各种标准（例如，核心突出结合低表面亮度的扩展发射和陡峭的光谱的中心区域），我们选择了一个子样本的候选重新启动的射电星系之间的13%和15%的主样本的158个源。我们将它们的性质与样本的其余部分进行比较，样本由残余候选者和活跃的射电星系组成。宿主星系的光学鉴定和表征表明候选重新启动，残余和活跃的射电星系具有类似的特性，这表明它们都来自同一个母体。相对于残留物，重新启动的射电星系比例略高，这表明重新启动阶段通常可以在相对较短的残留阶段（残留阶段的持续时间是107年的几倍）之后进行。这证实了残余和重新启动阶段是大质量椭圆星系生命周期的组成部分。初步的调查并没有表明这个周期对任何给定星系周围环境的强烈依赖。
Radio galaxies are known to go through cycles of activity, where phases of apparent quiescence can be followed by repeated activity of the central supermassive black hole. A better understanding of this cycle is crucial for ascertaining the energetic impact that the jets have on the host galaxy, but little is known about it. We used deep LOFAR images at 150 MHz of the Lockman Hole extragalactic field to select a sample of 158 radio sources with sizes > 60″ in different phases of their jet life cycle. Using a variety of criteria (e.g. core prominence combined with low-surface brightness of the extended emission and steep spectrum of the central region) we selected a subsample of candidate restarted radio galaxies representing between 13% and 15% of the 158 sources of the main sample. We compare their properties to the rest of the sample, which consists of remnant candidates and active radio galaxies. Optical identifications and characterisations of the host galaxies indicate similar properties for candidate restarted, remnant, and active radio galaxies, suggesting that they all come from the same parent population. The fraction of restarted radio galaxies is slightly higher with respect to remnants, suggesting that the restarted phase can often follow after a relatively short remnant phase (the duration of the remnant phase being a few times 107years). This confirms that the remnant and restarted phases are integral parts of the life cycle of massive elliptical galaxies. A preliminary investigation does not suggest a strong dependence of this cycle on the environment surrounding any given galaxy.
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