局域射电星系的占空比
The duty cycle of local radio galaxies
摘要：
我们使用一个体积和通量有限的本地（$0.03 \leq z \leq 0.1$）的射电星系与光学对应的样本来解决一个典型的星系花了多长时间在放射性活跃和静止状态的问题。活跃期的长度与宿主星系的恒星质量有很强的依赖性。最大规模主机中的无线电源也更频繁地被重新触发。在活跃阶段所花费的时间与气体冷却速率一样依赖于恒星质量，这表明静止阶段的开始是由于燃料耗尽。我们发现射电和发射线活动星系核的活动是独立的，与这些对应于不同的吸积状态。
英文摘要：
We use a volume- and flux-limited sample of local ($0.03 \leq z \leq 0.1$) radio galaxies with optical counterparts to address the question of how long a typical galaxy spends in radio-active and quiescent states. The length of the active phase has a strong dependence on the stellar mass of the host galaxy. Radio sources in the most massive hosts are also retriggered more frequently. The time spent in the active phase has the same dependence on stellar mass as does the gas cooling rate, suggesting the onset of the quiescent phase is due to fuel depletion. We find radio and emission line AGN activity to be independent, consistent with these corresponding to different accretion states.
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