中小尺度天体中的喷流特性与演化
Jet Properties and Evolution in Small and Intermediate Scale Objects
摘要：
运动学和光谱研究正在改善我们对致密射电源年龄分布的认识，提供证据表明小源通常非常年轻。喷流在大小范围从几十秒差距到几千秒差距的物体中的性质变得特别有趣。由于我们的选择标准和所涉及的小尺度，在紧凑对称对象（CSO）的人口喷流的属性还不是很清楚。偏振特性似乎表明与周围稠密介质相互作用的强烈影响，一些物体显示出相对论性整体运动的证据。更进化的射流是目前在类的低功率紧凑型（LPC）源和一些情况下进行了讨论。由于它是越来越清楚，不是所有这些来源将生存演变成大尺度射电星系，CSO和LPC人口的最终演变的问题也进行了讨论，候选人垂死的来源的例子。
英文摘要：
Kinematic and spectral studies are improving our knowledge of the age distribution in compact radio sources, providing evidence that small sources are generally very young. The properties of jets in objects spanning the size range from a few tens of parsecs to some kiloparsecs become then of particular interest. Because of our selection criteria and of the small scales involved, the properties of jets in the population of Compact Symmetric Objects (CSO) are not well known yet. Polarization properties seem to indicate a strong influence by the interaction with the dense surrounding medium, and some objects show evidence of relativistic bulk motion. More evolved jets are present in the class of Low Power Compact (LPC) sources and a number of cases are discussed here. Since it is becoming increasingly clear that not all these sources will survive to evolve into large scale radio galaxies, the question of the final evolution of the CSO and LPC population is also discussed, with examples of candidate dying sources.
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