论文标题
紧凑型陡峭的光谱和峰谱射线源
Compact steep-spectrum and peaked-spectrum radio sources
论文作者
论文摘要
紧凑型陡峭光谱（CSS）和峰值光谱（PS）无线电源是紧凑，强大的无线电来源。自早期对O'Dea（1998）回顾以来，对多频观测性质和当前理论进行了审查。 PS和CSS来源的性质有三个主要假设。 （1）PS消息来源可能是非常年轻的射电星系，它将在成为大型射电星系的过程中发展成为CSS的来源。 （2）PS和CSS源可能是紧凑的，因为它们通过与环境中的密集气体相互作用而限制（并增强了无线电功率）。 （3）或者，PS来源可能是短暂的或间歇源。这些假设中的每一个都可能适用于单个对象。每个人群的相对数量将对射电星系范式产生重大影响。长期基线的适当运动研究有助于确定三十多个来源的热点速度，并确定这些是年轻物体。多频极化观察结果表明，许多CS/PS来源都嵌入密集的星际培养基中，并与之剧烈相互作用。与无线电源对齐的发射线气体的检测以及[OIII]发射线的蓝移度HI吸收线表明，这些对象中存在AGN反馈 - 可能是由无线电源驱动的。已经讨论了在各种时间尺度上具有发作性AGN证据的CSS/PS来源。审查结束了关于未来的开放问题和前景的讨论。
Compact steep-spectrum (CSS) and peaked spectrum (PS) radio sources are compact, powerful radio sources. The multi-frequency observational properties and current theories are reviewed with emphasis on developments since the earlier review of O'Dea (1998). There are three main hypotheses for the nature of PS and CSS sources. (1) The PS sources might be very young radio galaxies which will evolve into CSS sources on their way to becoming large radio galaxies. (2) The PS and CSS sources might be compact because they are confined (and enhanced in radio power) by interaction with dense gas in their environments. (3) Alternately, the PS sources might be transient or intermittent sources. Each of these hypotheses may apply to individual objects. The relative number in each population will have significant implications for the radio galaxy paradigm. Proper motion studies over long time baselines have helped determine hotspot speeds for over three dozen sources and establish that these are young objects. Multifrequency polarization observations have demonstrated that many CSS/PS sources are embedded in a dense interstellar medium and vigorously interacting with it. The detection of emission line gas aligned with the radio source, and blue-shifted HI absorption and [OIII] emission lines indicates that AGN feedback is present in these objects -- possibly driven by the radio source. CSS/PS sources with evidence of episodic AGN over a large range of time-scales have been discussed. The review closes with a discussion of open questions and prospects for the future.
