| 云南天文台40米射电望远镜河外射电源观测 |
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| 引用本文： | 刘彬,李建斌,董亮,施硕彪,高冠男,汪敏,刘丽佳,彭勃.云南天文台40米射电望远镜河外射电源观测[J].天文研究与技术,2012(1):7-13. |
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| 作者姓名： | 刘彬 李建斌 董亮 施硕彪 高冠男 汪敏 刘丽佳 彭勃 |
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| 作者单位： | 中国科学院国家天文台;中国科学院射电天文重点实验室;中国科学院国家天文台云南天文台 |
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| 基金项目： | 科技部973项目(2012CB821800)资助 |
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| 摘 要： | 为了在云南天文台40 m天线上开展射电天文研究,使用它进行了河外射电源流量试观测。通过对河外致密源进行ON/OFF跟踪观测,得到射电源的流量变化曲线。但数据质量并不理想,说明系统存在一些问题。随后,根据对该望远镜系统的稳定性及其无线电环境干扰现状的考察,以及对现存问题的分析,提出了相应的解决方法。
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| 关 键 词： | 射电天文 天线 流量观测 无线电干扰 |
Observations of Extragalactic Radio Sources with the 40 m Radio Telescope of the Yunnan Observatory |
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| Liu Bin,Li Jianbin,Dong Liang,Shi Shuobiao,Gao Guannan,Wang Min,Liu Lijia,Peng Bo.Observations of Extragalactic Radio Sources with the 40 m Radio Telescope of the Yunnan Observatory[J].Astronomical Research & Technology,2012(1):7-13. |
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| Authors: | Liu Bin Li Jianbin Dong Liang Shi Shuobiao Gao Guannan Wang Min Liu Lijia Peng Bo |
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| Institution: | 1,2(1.National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China 2.Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Beijing 100012,China; 3.National Astronomical Observatories/Yunnan Observatory,Chinese Academy of Sciences,Kunming 650011,China) |
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| Abstract: | To open new opportunities on radio astronomical research with the recently constructed YNAO 40 m radio telescope,we carried out test observations of extragalactic radio sources.Three compact radio sources(3C273,3C295,and 0716+714) were observed with the ON/OFF mode.In such a mode the telescope was pointed first toward the source and then 2 degrees off the source.In each cycle there are 2 minutes on-source observation and 2 minutes off-source observation.The observational wavelength bands were alternated between the S and X bands but with short time intervals.We present here the S-and X-band flux-density curves of the three sources.There are unexpected drifts on various time scales in these curves.The sensitivity limits of the observations are about 1 Jy.Through the observation,we have identified problems of the telescope stability and environmental radio-frequency interference.By pointing the telescope to the Zenith without tracking,we found ≤1% per hour drifts in the flux-density curve,which are much less than the drifts observed in an ON/OFF mode for a source.In the S band,there is a strong interference signal at the frequency 2 142 MHz.This interference signal has several harmonics,so that it polluted our data severely.The frequency interference in the X band is weaker than in the S band.We finally propose measures to improve the telescope capacity.These include developing of a counter-interference system,using a radiometer for measuring the K factor to eliminate gain drifts of devices,and performing drift-scan observation without telescope tracking to avoid other unstable factors. |
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| Keywords: | Radio Astronomy Radio telescope Flux-density measurements Radio-frequency interference |
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