High Resolution Radio Studies of Active Galaxies

活动星系的高分辨率射电研究

• 批准号: 8919386
• 负责人: Robert Mutel
• 金额: $ 14.5万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-15 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8919386&HistoricalAwards=false
• 关键词: Resolution; Radio; Studies; Active; Galaxies

The energetic cores of the nuclei of active galaxies can only be observed with instruments offering extremely high angular resolu- tion. This program utilizes the Very Large Array (VLA) and the techniques of Very Long Baseline Interferometry (VLBI) to inves- tigate three classes of these objects. BL Lacertae is a vio- lently varying radio source which has been identified with such a galactic core. VLBI observations of this object will be critical in testing a model of weak shocks propagating down an expanding relativistic flow which seems to fit past observations. Several candidates for the classification of 'compact double' will also be observed to test the hypotheses that these are 'young' sources which arise from recent tidal interactions. Finally, a high dynamic range map of the one-sided kiloparsec scale jet in 3C147 will be made to examine the idea that the one-sidedness is due to Doppler broadening. Dr. Mutel has been a leader in the application of Very Long Baseline Interferometry (VLBI) to astronomical problems and is the executive officer or the U. S. VLBI Consortium.

只有提供极高角度分辨率的仪器才能观测到活动星系核的高能核心。该程序利用甚大阵列(VLA)和甚长基线干涉测量(VLBI)技术对这三类物体进行了研究。BL Lacertae是一种振动变化的射电源，它已经被确定为这样一个星系核心。对该天体的VLBI观测将对测试沿着扩展的相对论流传播的弱冲击模型至关重要，该模型似乎与过去的观测相吻合。还将观察到几个分类为“致密双星”的候选者，以检验这些是近期潮汐相互作用产生的“年轻”源的假设。最后，我们将制作一张3C147中单侧千帕秒尺度急流的高动态范围图，以检验这种单边现象是由多普勒展宽引起的。Mutel博士是甚长基线干涉测量(VLBI)应用于天文问题的领导者，也是美国VLBI联盟的执行官员。