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: 9802708
• 负责人: John F. Wardle
• 金额: $ 30.74万
• 依托单位: Brandeis University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802708&HistoricalAwards=false
• 关键词: Milliarcsecond; Polarization; Studies; Compact; ExtragalacticRadio

AST 98-02708 John Wardle Dr. Wardle is studying powerful extragalactic radio sources at the highest resolution attainable (on a linear scale of parsecs or less). He is using the Very Long Baseline Array (VLBA) and the Coordinated Millimeter VLBI Array. The energy sources for these extragalactic radio sources are observed in the centers of quasars and active galaxies. Enormous amounts of energy are generated in very small volumes, widely though to be due to the infall of material onto a supermassive black hole. At radio wavelengths one sees compact 'cores' and elongated 'jets' that vary rapidly in total intensity and polarizataion. Often bright knots of radio emission appear to move down the jets at several times the speed of light. The PI is imaging the polarized (synchrotron) radiation from these radio sources at milliarcsecond resolution. Linearly polarized images contain unique information about the order and orientation of the magnetic field, and on relativistic aberration, that cannot be obtained from total intensity images. Sequences of such images form frames of the "magnetic movie" in which the evolution of the magnetic field can be followed in both time and space. ***

AST 98-02708 John Wardle Dr. Wardle博士正在研究可实现最高分辨率的强大分类无线电来源（以PARSEC的线性规模或更少）。 他正在使用非常长的基线阵列（VLBA）和协调的毫米VLBI阵列。 在类星体和活动星系的中心观察到这些外乳外无线电来源的能源。 大量的能量以很小的体积产生，尽管材料中插入了超级质量的黑洞中，但仍广泛产生。 在无线电波长下，人们会看到紧凑的“核心”和拉长的“喷气机”，在总强度和极化方面迅速变化。 通常，无线电发射的明亮结似乎是光速的几倍。 PI正在以MilliarcSecond分辨率的这些无线电来源成像两极分化的（同步）辐射。 线性极化图像包含有关磁场的顺序和方向以及相对论畸变的独特信息，这些信息无法从总强度图像中获得。 这种图像的序列形成了“磁性电影”的帧，其中可以在时间和空间中遵循磁场的演变。 ***