The LBA Calibrator Survey of southern compact extragalactic radio sources-LCS1
The LBA Calibrator Survey of southern compact extragalactic radio sources-LCS1
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DOI：
10.1111/j.1365-2966.2011.18570.x
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发表时间：
2011-07-01
影响因子：
4.8
通讯作者：
Sadler, Elaine M.
中科院分区：
文献类型：
--
作者：
Petrov, Leonid;Phillips, Chris;Sadler, Elaine M.
我们提出了一份精确位置和相关通量密度的目录，其中包含了410个平坦频谱、紧凑的河外射电源，这些射电源以前是在澳大利亚望远镜20 GHz （AT20G）调查中探测到的。该目录跨越了赤纬范围[-90度，-40度]，由澳大利亚长基线阵列在8.3 GHz下进行的4次24小时甚长基线干涉测量（VLBI）观测构建而成。这些实验的VLBI检出率为97%，源位置的中位数不确定度为2.6 mas，超过1000 km的投影基线上的中位数相关通量密度为0.14 Jy。本文的目标是：(1)提供位置精确到几毫弧秒的南方源库，可用于相位参考观测、大地VLBI和空间导航；(2)将紧凑的河外源的完整通量限制样本扩展到南半球；(3)研究AT20G调查中选定高频源的秒差尺度特性。这次VLBI活动的结果是，在赤纬-40度以南测量了VLBI相关通量密度和已知位置的紧凑射电源的数量增加了3.5倍，其精度为毫弧秒。目录和辅助材料可在http://astrogeo.org/lcs1上获得。
We present a catalogue of accurate positions and correlated flux densities for 410 flat-spectrum, compact extragalactic radio sources previously detected in the Australia Telescope 20 GHz (AT20G) survey. The catalogue spans the declination range [-90 degrees, -40 degrees] and was constructed from four 24-h very long baseline interferometry (VLBI) observing sessions with the Australian Long Baseline Array at 8.3 GHz. The VLBI detection rate in these experiments is 97 per cent, the median uncertainty of the source positions is 2.6 mas and the median correlated flux density on projected baselines longer than 1000 km is 0.14 Jy. The goals of this work are (1) to provide a pool of southern sources with positions accurate to a few milliarcsec, which can be used for phase-referencing observations, geodetic VLBI and space navigation; (2) to extend the complete flux-limited sample of compact extragalactic sources to the Southern hemisphere; and (3) to investigate the parsec-scale properties of high-frequency selected sources from the AT20G survey. As a result of this VLBI campaign, the number of compact radio sources south of declination -40 degrees which have measured VLBI correlated flux densities and positions known to milliarcsec accuracy has increased by a factor of 3.5. The catalogue and supporting material is available at http://astrogeo.org/lcs1.