Milliarcsecond Polarization Studies of Compact ExtragalacticRadio Sources

紧凑型河外射电源的毫弧秒偏振研究

• 批准号: 8901743
• 负责人: John F. Wardle
• 金额: $ 17.52万
• 依托单位: Brandeis University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8901743&HistoricalAwards=false
• 关键词: Milliarcsecond; Polarization; Studies; Compact; ExtragalacticRadio

The distributions of the linear polarization of radio wavelength emission from compact radio sources will be studied at milliarcsecond resolution using the technique of the Very Long Baseline Interferometry (VLBI). These radio sources are associated with the nuclei of quasars and active galaxies, where enormous amounts of energy are emitted on very short timescales, probably due to the infall of material onto a supermassive black hole. The energy manifests itself as radiation on all parts of the electromagnetic spectrum. At radio wavelengths we see compact radio-emitting `cores' and `jet-like' features, that vary rapidly in both total intensity and polarization. In many sources, bright knots of emission appear to be moving down the jets at several times the speed of light. The goals of the observations are: (1), to map the topology of the magnetic field structures and to study their evoulution; (2), to obtain kinematic and geometric information to constrin models of superluminal sources; (3), to help understand the differences between differnt classes of compact radio sources; (4), to probe the plasma surrounding the rdio sources in the innermost regions of quasars and active galactic nuclei; and (5), to study the relationship between the milliarcsecond radio structure and the large scale (much greater than 1 arcsecond) jets and lobes found in extended radio sources.

将使用非常长的基线干涉法（VLBI）的技术研究，将在MilliarcSecond分辨率下研究无线电波长发射的线性极化的分布。 这些无线电来源与类星体和有源星系的核有关，在很短的时间尺度上排放了大量能量，可能是由于材料中插入了超大型黑洞上。 能量在电磁光谱的所有部分都表现为辐射。 在无线电波长下，我们看到紧凑的放射发射“核心”和“喷气样”特征，这些特征在总强度和极化方面都迅速差异。 在许多来源，明亮的发射结似乎是光速的几倍。 观察的目标是：（1），绘制磁场结构的拓扑结构并研究其消除； （2），将运动和几何信息获取到静光源的约束模型； （3），以帮助了解紧凑型无线电源的不同类别之间的差异； （4），探测了类星体和活性银河核的最内向区域中RDIO来源周围的血浆； （5），研究Milliarcsecond Radio结构与大型射流（大于1个弧形）的射流和裂片之间的关系。