南方致密河外射电源的LBA射电巡天- LCS1
The LBA Calibrator Survey of southern compact extragalactic radio sources - LCS1
摘要：
我们提出了一个目录的位置和相关的流量密度的410平谱，紧凑的河外射电源，以前发现的AT 20 G调查。该星表涵盖了-90度和-40度的十进制范围，由澳大利亚长基线阵列在8.3 GHz上进行的四次24小时VLBI观测组成。在这些实验中的检测率为97%。源位置不确定度的中位数为2.6 mas，基线投影长度大于1000 km的相关通量密度的中位数为0.14 Jy。这项工作的目标是：（1）提供一个位置已知精度为毫角秒的源库，这些源是相位参考观测、大地VLBI和空间导航所需的;（2）将完整的通量限制的致密河外源样本扩展到南半球;（3）研究从AT 20 G巡天中选出的高频源的秒差距尺度特性。由于这一活动，用VLBI可探测到的磁偏角<-40度的致密射电源的数量增加了3.5倍，这些射电源的测量相关通量密度和位置已知精度为毫弧秒。目录和辅助材料可在http://astrogeo.org/lcs1上查阅。
英文摘要：
We present a catalogue of positions and correlated flux densities of 410 flat-spectrum, compact extragalactic radio sources, previously detected in the AT20G survey. The catalogue spans the declination range -90deg, -40deg and was constructed from four 24 hour VLBI observing sessions with the Australian Long Baseline Array made at 8.3 GHz. The detection rate in these experiments is 97%. The median uncertainty of source positions is 2.6 mas, the median correlated flux density at baseline projections lengths longer than 1000 km is 0.14 Jy. The goal of this work is 1) to provide a pool of sources with positions known at the milliarcsecond level of accuracy that are needed for phase referencing observations, for geodetic VLBI, and for space navigation; 2) to extend the complete flux-limited sample of compact extragalactic sources to the southern hemisphere; and 3) to investigate parsec-scale properties of high-frequency selected sources from the AT20G survey. As a result of the campaign, the number of compact radio sources with declinations < -40deg detectable with VLBI with measured correlated flux densities and positions known with the milliarcsec level of accuracies increased by a factor of 3.5. The catalogue and supporting material is available at http://astrogeo.org/lcs1 .
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
