VLA低波段电离层和瞬变实验（VLITE）：一次共同巡天
The VLA Low Band Ionospheric and Transient Experiment (VLITE): A Commensal Sky Survey
摘要：
美国海军研究实验室（NRL）和国家射电天文台（NRAO）合作开发、安装并调试了卡尔G号上的新射电天文系统。Jansky甚大阵列（VLA）VLA低波段电离层和瞬态实验（VLITE）利用专用采样器和光纤从10个VLA低波段接收器中提取信号，并通过实时DiFX相关器进行相关。VLITE允许同时使用VLA通过NRAO WIDAR相关器使用较高频率接收器（1-50 GHz）和通过DiFX相关器使用较低频率来观察初级科学。VLITE在几乎所有的观测计划中运行，并提供以352 MHz为中心的64 MHz带宽。VLITE的运行不需要运行主要科学的VLA系统的额外资源，并进行特别的天空调查。该系统通过增值的PI科学，独立的天体物理学，打开了一个新的窗口，瞬态搜索和意外发现大大扩展了VLA的能力。在运行的第一年，我们已经记录了超过6300小时的天空分布。我们提出了VLITE计划的概述，讨论了在第一年的操作过程中获得的天空覆盖范围和深度，并简要概述了天体物理学和瞬变方案。
英文摘要：
The US Naval Research Laboratory (NRL) and the National Radio Astronomy Observatory (NRAO) have collaborated to develop, install, and commission a new commensal system on the Karl G. Jansky Very Large Array (VLA). The VLA Low Band Ionospheric and Transient Experiment (VLITE) makes use of dedicated samplers and fibers to tap the signal from 10 VLA low band receivers and correlate those through a real-time DiFX correlator. VLITE allows for the simultaneous use of the VLA to observe primary science using the higher frequencies receivers (1-50 GHz) through the NRAO WIDAR correlator and lower frequencies through the DiFX correlator. VLITE operates during nearly all observing programs and provides 64 MHz of bandwidth centered at 352 MHz. The operation of VLITE requires no additional resources from the VLA system running the primary science and produces an ad-hoc sky survey. The commensal system greatly expands the capabilities of the VLA through value-added PI science, stand-alone astrophysics, the opening of a new window on transient searches, and serendipity. In the first year of operation we have recorded more than 6300 hours spread across the sky. We present an overview of the VLITE program, discuss the sky coverage and depth obtained during the first year of operation, and briefly outline the astrophysics and transients programs.
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