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arXiv 1111.6398astro-ph.IM
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利用平方公里阵列的极高角分辨率科学

Very High Angular Resolution Science with the Square Kilometre Array

L. E. H. Godfrey, H. Bignall, S. Tingay, L. Harvey-Smith, M. Kramer, S. Burke-Spolaor, J. C. A. Miller-Jones, M. Johnston-Hollitt, R. Ekers, S. Gulyaev

摘要:

平方公里阵列(SKA)的初步规格要求碟形阵列总收集面积的25%位于距离核心180公里以上的地方,最大基线至少为3000公里。该阵列将在0.5 - 10 GHz下提供约40 - 2 mas的角分辨率,在500 MHz带宽的8小时积分中,图像灵敏度达到< 50 nJy/束。鉴于这些规格,SKA的高角分辨率组件将能够以毫弧秒尺度的角分辨率探测< 200 K的亮温。本文的目的是集中讨论SKA将促成的新的和重要的高角分辨率科学的广泛范围,并在这样做时,讨论作为SKA一部分的长基线的优点。我们强调这样一个事实,即高角分辨率要求基线大于1000公里,提供了丰富的科学案例,从天体物理学的许多领域的项目,包括重要的贡献,关键SKA科学。

英文摘要:

Preliminary specifications for the Square Kilometre Array (SKA) call for 25% of the total collecting area of the dish array to be located at distances greater than 180 km from the core, with a maximum baseline of at least 3000 km. The array will provide angular resolution ~ 40 - 2 mas at 0.5 - 10 GHz with image sensitivity reaching < 50 nJy/beam in an 8 hour integration with 500 MHz bandwidth. Given these specifications, the high angular resolution component of the SKA will be capable of detecting brightness temperatures < 200 K with milliarcsecond-scale angular resolution. The aim of this article is to bring together in one place a discussion of the broad range of new and important high angular resolution science that will be enabled by the SKA, and in doing so, address the merits of long baselines as part of the SKA. We highlight the fact that high angular resolution requiring baselines greater than 1000 km provides a rich science case with projects from many areas of astrophysics, including important contributions to key SKA science.

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。

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