High Resolution Radio Studies of Active Galaxies

活动星系核心的高能核心只能用具有极高角度分辨率的仪器来观测。该计划利用甚大阵列（VLA）和甚长基线干涉测量（VLBI）技术来研究这三类物体。蓝带座BL是一个剧烈变化的射电源，已被确定与这样一个星系核心。对这个天体的VLBI观测对于检验一个弱激波沿着膨胀的相对论流传播的模型至关重要，这个模型似乎符合过去的观测结果。还将观察到几个“紧致双星”分类的候选者，以验证这些是最近潮汐相互作用产生的“年轻”源的假设。最后，绘制了3C147中单侧千秒尺度射流的高动态范围图，以验证单侧性是由多普勒展宽引起的观点。Mutel博士一直是超长基线干涉测量（VLBI）应用于天文学问题的领导者，并且是美国VLBI联盟的执行官。

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.