THE DATA REDUCTION OF RADIO OBSERVATIONS WITH SUB-ARCSECOND RESOLUTION
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摘要: 使用英国多单元联线干涉网(MERLIN), 及美国甚大阵(VLA)对河外射电源进行了多频观测, 获得了亚角秒分辨率的图象. 使用自核准技术及洁化技术, 改善了成图的动态范围. 哈勃空间望远镜(HST), 也对该河外射电源进行了光学观测. 本文介绍了射电图和光学图进行重叠的方法, 用以比较射电发射的等离子体和光学线发射云之间的物理联系.Abstract: An extragalaactic radio source -NGC 5929 is obeerved by MERLINand VLAat multiple frequencies. The radio images achieved a resolution of the sub-arcsecond.There are serious disturbanes of the phase in the visibility at 408 MHz, due to theatmospheric effects above the antenna of MERLIN In addition, MERLINconsists ofseven telescopes. The array missed some information in (u, v) plane and causeddifficulty for mapping. The self-calibration and clean techniques are used to improvethe dynamic range of the images. The Hubble space telescope made the photographsof NGC5929 by the Planetary camra. In order to compare the optical line emittinggas with the edo endning plasma The 1.6 GHz contour map is superimposed on the[OⅢ] image. The paper introduces the data reduction method for NGC5929.
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Key words:
- Radio-astronomical method /
- Data reduction /
- Compact radio sources
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