乌鲁木齐25m射电望远镜的 单天线观测研究

自1993年乌鲁木齐天文站25m射电望远镜建成以来，除了不断完善VLBI观测系统外，还选择发展了具有科学价值的单天线天体物理观测课题。其中基于常温接收机的脉冲星脉冲到达时间观测系统已经于1999年5～6月间建成。该系统建立在25m射电天线的18cm波段上，消色散采用了2×128×2．5MHz多通道滤波器和数字化器，并由PC机完成数据采集。同时进行的脉冲星工作还有92cm及其它波段的脉冲轮廓监测，对0329+54的多波段观测得到了它的频谱。在25m天线的1．3cm波段上建立了基于声表面波频谱仪和频率综合器的分子谱线观测系统，对水脉泽的观测已经发现了十几个可能的水脉泽源，观测结果正在认证当中。

Single Dish Astrophysics Observations at Urumqi Astronomical Observatory

Since the building up of Urumqi 25m radio telescope in 1993, except improving the VLBI system, we have developed the single dish astrophysics observational systems. Among them, the pulsar timing system was built at 18cm, which has been operational since mid-1999 with a receiver working in room temperature. Dedispersing is provided by a 2 x 128 x 2.5MHz filterbank based on PC data acquisition. Monitoring of pulse profile and intensity on 92cm to some pulsars are in progress. We obtained the spectrum of PSR B0329 54 by multi-frequency observations. Acoustic surface wave spectrometer and frequency synthesizer form the molecules spectrum observation system, have been developed at 1.3cm frequency. H2O maser observations have found more than 10 possible sources.