High resolution multi-wavelength studies of jets in 4 Stokes parameters

4 斯托克斯参数射流的高分辨率多波长研究

• 批准号: 0607453
• 负责人: John F. Wardle
• 金额: $ 34.13万
• 依托单位: Brandeis University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607453&HistoricalAwards=false
• 关键词: resolution; multi; wavelength; studies; jets

AST-0607453WardleThis project will use the highest resolution radio wavelength observations of the powerful jets seen to shoot out at close to the speed of light from the hearts of active galaxies, to answer fundamental questions about the jets and their central engines. All magneto-hydrodynamic models require the jets to carry enormous electric currents, which are detected via the linear and circular polarization of the radio emission. This work will measure the current in many jets, attempt to measure the true magnetic flux density in the jets, and study their interaction with their surroundings in new ways. This is one of the few projects attempting this very difficult polarization work, and it will push the ability of the Very Long Baseline Array to make circular and linear polarization observations to millimeter wavelengths. A small (undergraduate) study of the nearby microquasar SS433 may shed some light on the much larger jets in distant galaxies.Data, model fits, and movie visualizations from the previous monitoring campaign are publicly available and a useful teaching tool: these activities will be continued with the current work. Students are always involved in the research of this team, working one-on-one with faculty on projects designed to be particularly appropriate for undergraduate research. In addition, many non-science majors experience research and education through activities with this research team, and graduate with a deeper appreciation of the nature of science and of the scientific enterprise.

这个项目将使用最高分辨率的无线电波长观测从活跃星系中心以接近光速射出的强大喷流，以回答有关喷流及其中央引擎的基本问题。所有的磁流体动力学模型都要求喷流携带巨大的电流，这是通过无线电发射的线性和圆极化来检测的。这项工作将测量许多喷流中的电流，尝试测量喷流中的真实磁通密度，并以新的方式研究它们与周围环境的相互作用。这是少数几个尝试这种非常困难的偏振工作的项目之一，它将推动超长基线阵列的能力，使圆和线性偏振观测到毫米波长。对附近的微类星体SS433进行的一项小型（本科生）研究可能会对遥远星系中更大的喷流提供一些启示。以前监测活动的数据、模型拟合和电影可视化都是公开的，是有用的教学工具：这些活动将在当前工作中继续进行。学生总是参与这个团队的研究，与教师一对一地进行特别适合本科生研究的项目。此外，许多非科学专业的学生通过这个研究团队的活动体验了研究和教育，毕业时对科学的本质和科学事业有了更深的认识。