Stacking of large interferometric data sets in the image- and uv-domain - a comparative study
Stacking of large interferometric data sets in the image- and uv-domain - a comparative study
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图像域和紫外域中大型干涉数据集的堆叠 - 比较研究
DOI：
10.1093/mnras/stu2344
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发表时间：
2014
影响因子：
4.8
通讯作者：
I. Martí
中科院分区：
文献类型：
--
作者：
L. Lindroos;K. Knudsen;W. Vlemmings;J. Conway;I. Martí
提出了一种新的紫外域射电干涉数据叠加算法。利用模拟的阿塔卡玛大型毫米/亚毫米阵列和卡尔G. Jansky Very Large Array（VLA）Deep Extragalactic Survey（Jansky甚大阵深河外巡天）我们发现，图像和紫外叠加产生类似的结果，然而，紫外叠加通常是更强大的方法。紫外线叠加算法的一个优点是紫外线数据后叠加的可用性，这使得有可能识别和删除有问题的基线。对于深VLA调查，紫外叠加产生的信噪比比图像叠加高20%。此外，我们已经研究了堆叠的解决源与模拟VLA数据集，其中1.5弧秒（10-12千秒差距在z类似于1-4）源堆叠。我们发现，紫外线叠加，其中一个模型是直接拟合的vibrium，显着提高了精度和鲁棒性的大小估计。虽然这项工作的科学动机是研究微弱的高z星系，但这里分析的算法也适用于天文学的其他领域。无线电干涉测量数据的叠加预计也将在未来使用低频阵列和平方公里阵列等望远镜进行的调查中发挥重要作用。
We present a new algorithm for stacking radio interferometric data in the uv-domain. The performance of uv-stacking is compared to the stacking of fully imaged data using simulated Atacama Large Millimeter/submillimeter Array and the Karl G. Jansky Very Large Array (VLA) deep extragalactic surveys. We find that image-and uv-stacking produce similar results, however, uv-stacking is typically the more robust method. An advantage of the uv-stacking algorithm is the availability of uv-data post-stacking, which makes it possible to identify and remove problematic baselines. For deep VLA surveys uv-stacking yields a signal-to-noise ratio that is up to 20 per cent higher than image-stacking. Furthermore, we have investigated stacking of resolved sources with a simulated VLA data set where 1.5 arcsec (10-12 kpc at z similar to 1-4) sources are stacked. We find that uv-stacking, where a model is fitted directly to the visibilities, significantly improves the accuracy and robustness of the size estimates. While scientific motivation for this work is studying faint, high-z galaxies, the algorithm analysed here would also be applicable in other fields of astronomy. Stacking of radio interferometric data is also expected to play a big role for future surveys with telescopes such as Low-Frequency Array and Square Kilometre Array.
DOI：
10.1086/516587
发表时间：
2006-12
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
E. Schinnerer;V. Smolčić;C. Carilli;M. Bondi;P. Ciliegi;K. Jahnke;N. Scoville;H. Aussel;F. Bertoldi;A. Blain;C. Impey;A. Koekemoer;O. Fèvre;C. M. U. Mpia;Nrao;-INAF;Caltech;CEASaclay;AIfA;U. Arizona;Stsci;Lam;Yale
通讯作者：
E. Schinnerer;V. Smolčić;C. Carilli;M. Bondi;P. Ciliegi;K. Jahnke;N. Scoville;H. Aussel;F. Bertoldi;A. Blain;C. Impey;A. Koekemoer;O. Fèvre;C. M. U. Mpia;Nrao;-INAF;Caltech;CEASaclay;AIfA;U. Arizona;Stsci;Lam;Yale