年轻射电源短时标间歇活动的吸积盘模型
Accretion Disk Model of Short-Timescale Intermittent Activity in Young Radio Sources
摘要：
我们认为，短寿命的致密射电源的存在与吸积盘内辐射压不稳定性引起的中央发动机的间歇性活动有关。根据对射电强活动星系的人口研究以及对其射电形态的详细调查，这些天体可能构成千兆赫兹峰值频谱源的许多子类。我们进行模型计算，假设粘度参数化成比例的总压力和气体压力的几何平均值。隐含的时间尺度与观测到的来源年龄一致。中等吸积率的活跃阶段持续时间很短（< 10^3-10^4年），喷出物被限制在宿主星系内，因此这些源不能演化成大尺寸的射电星系，除非它们接近爱丁顿极限。
英文摘要：
We associate the existence of short-lived compact radio sources with the intermittent activity of the central engine caused by a radiation pressure instability within an accretion disk. Such objects may constitute a numerous sub-class of Giga-Hertz Peaked Spectrum sources, in accordance with the population studies of radio-loud active galaxies, as well as detailed investigations of their radio morphologies. We perform the model computations assuming the viscosity parametrization as proportional to a geometrical mean of the total and gas pressure. The implied timescales are consistent with the observed ages of the sources. The duration of an active phase for a moderate accretion rate is short enough (< 10^3-10^4 years) that the ejecta are confined within the host galaxy and thus these sources cannot evolve into large size radio galaxies unless they are close to the Eddington limit.
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