FIRST LIGHT FOR THE FIRST STATION OF THE LONG WAVELENGTH ARRAY
FIRST LIGHT FOR THE FIRST STATION OF THE LONG WAVELENGTH ARRAY
复制标题
DOI：
10.1142/s2251171712500043
复制
发表时间：
2012-06
期刊：
影响因子：
--
通讯作者：
G. Taylor;S. Ellingson;N. Kassim;J. Craig;J. Dowell;C. Wolfe;J. Hartman;G. Bernardi;T. Clarke-T.
中科院分区：
文献类型：
--
作者：
G. Taylor;S. Ellingson;N. Kassim;J. Craig;J. Dowell;C. Wolfe;J. Hartman;G. Bernardi;T. Clarke-T.
长波长阵列的第一个台站（LWA 1）于2011年4月完成，目前正在进行第一次招标后的观测，此外还在继续进行调试和定性观测。该仪器由258个双极化偶极子组成，这些偶极子被数字化并组合成光束。四个独立可控的双极化波束可用，每个波束具有两个16 MHz带宽的调谐，可以独立调谐到10 MHz和88 MHz之间的任何频率。天顶指向的系统等效通量密度为~3 kJy，并且与频率近似无关;这相当于~5 Jy/光束（5σ，1 s）的灵敏度;使其成为最灵敏的米波射电望远镜之一。LWA 1还具有两种“瞬态缓冲”模式，允许同时从所有偶极子进行相干记录，提供瞬时全天视场。LWA 1为银河系科学、脉冲星科学和宇宙科学提供了多功能和独特的新能力。
The first station of the Long Wavelength Array (LWA1) was completed in April 2011 and is currently performing observations resulting from its first call for proposals in addition to a continuing program of commissioning and characterization observations. The instrument consists of 258 dual-polarization dipoles, which are digitized and combined into beams. Four independently-steerable dual-polarization beams are available, each with two tunings of 16 MHz bandwidth that can be independently tuned to any frequency between 10 MHz and 88 MHz. The system equivalent flux density for zenith pointing is ~3 kJy and is approximately independent of frequency; this corresponds to a sensitivity of ~5 Jy/beam (5σ, 1 s); making it one of the most sensitive meter-wavelength radio telescopes. LWA1 also has two "transient buffer" modes which allow coherent recording from all dipoles simultaneously, providing instantaneous all-sky field of view. LWA1 provides versatile and unique new capabilities for Galactic science, pulsar...