论文标题
广场VLBA校准器调查-WFCS
The wide-field VLBA calibrator survey -- WFCS
论文作者
论文摘要
本文介绍了迄今为止最大的VLBI绝对天文统计活动的结果，该活动的观测值是13,645个无线电来源，其基线阵列很长（VLBA）。其中有7220个被检测到，其中包括以前从未在VLBI观察到的6755个目标来源。这使得目前的VLBI目录成为有史以来最大的发表。目标源的位置已通过中位不确定性1.7 MAS确定，并生成了15,599个7179个来源的图像。与以前的绝对射线天体运动活动不同，使用单个宽带接收器同时进行了4.3和7.6 GHz的观测。由于光谱和时间分辨率良好，视野为4至8个弧形 - 在先前的调查中大于10至20个弧秒。这使得使用具有较低位置精度的输入目录并在扩展源中检测到紧凑的组件。与以前的绝对天体运动不同，观察到陡峭和平坦的光谱源。该观察结果是在所谓的填充模式下安排的，以填补其他高优先级程序之间的空白。这是通过制定全自动调度程序来实现的。
The paper presents the results of the largest to date VLBI absolute astrometry campaign of observations of 13,645 radio sources with the Very Long Baseline Array (VLBA). Of them, 7220 have been detected, including 6755 target sources that have never been observed with VLBI before. This makes the present VLBI catalogue the largest ever published. Positions of the target sources have been determined with the median uncertainty 1.7 mas, and 15,599 images of 7179 sources have been generated. Unlike to previous absolute radio astrometry campaigns, observations were made at 4.3 and 7.6 GHz simultaneously using a single wide-band receiver. Because of the fine spectral and time resolutions, the field of view was 4 to 8 arcminutes -- much greater than 10 to 20 arcseconds in previous surveys. This made possible to use input catalogues with low position accuracy and detect a compact component in extended sources. Unlike to previous absolute astrometry campaigns, both steep and flat spectrum sources were observed. The observations were scheduled in the so-called fill-in mode to fill the gaps between other high priority programs. That was achieved by development of the totally automatic scheduling procedure.
