论文标题

高分辨率,广阔的场,狭窄的乐队,快照成像

High Resolution, Wide Field, Narrow Band, Snapshot Imaging

论文作者

Carilli, C. L., Murphy, E., Rosero, V., Mooley, K., Jimenez-Andrade, E., Golap, K., Butler, B.

论文摘要

我们研究了在广泛的场,高分辨率,狭窄的频带,快照成像的情况下,研究了干涉阵列的成像性能。我们发现,当紫外线大小足够小(即图像大小足够大)时,每个瞬时可见性记录都会将其网格插入其自己的UV-cell中。这甚至适用于密集的阵列,就像下一代VLA的核心一样。在这种特殊的应用中,网格可见性的均匀加权接近自然加权,其通常会对所得合成的束产生有害的后果。对于核心主导的阵列,我们表明所产生的图像噪声在与核心基线的空间频率相当的尺度上高度相关。总的来说,这项研究强调了一个事实,即对于需要高分辨率的成像应用(平原阵列和更大),许多核心天线可以用作低分辨率科学的单独子阵列,而无需牺牲高分辨率科学的质量。

We investigate the imaging performance of an interferometric array in the case of wide field, high resolution, narrow band, snapshot imaging. We find that, when uv-cell sizes are sufficiently small (ie. image sizes are sufficiently large), each instantaneous visibility record is gridded into its own uv-cell. This holds even for dense arrays, like the core of the next generation VLA. In this particular, application, Uniform weighting of the gridded visibilities approaches Natural weighting, with its often deleterious consequences on the resulting synthesized beam. For a core-dominated array, we show that the resulting image noise is highly correlated on scales comparable to the spatial frequencies of the core baselines. In general, this study accentuates the fact that, for imaging applications that require high resolution (Plains array and greater), many of the core antennas can be employed as a separate subarray for low resolution science, without sacrificing the quality of the high resolution science.

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