标题： FLAG的调试：GBT的相控阵馈源 显示英文标题

标题： Commissioning of FLAG: A phased array feed for the GBT

摘要： 相位阵列馈电（PAF）技术是在结合高灵敏度和大视场方面射电天文学的下一大进步。 绿岸望远镜的焦点L波段阵列（FLAG）是迄今为止开发的最敏感的PAF之一。 它由19个双极化元件组成，安装在主焦点杜瓦中，从而在天空上产生七个波束。 其前所未有的系统温度为$\sim$17 K，与当代单像素馈电相比，将使脉冲星调查速度提高三倍。 在FLAG最近完成的调试阶段中进行了早期科学观测，我们清楚地展示了其科学能力。 我们观测了一组正常脉冲星和毫秒脉冲星，并从PSR B1937+21中检测到了巨脉冲。 显示英文摘要

摘要： Phased Array Feed (PAF) technology is the next major advancement in radio astronomy in terms of combining high sensitivity and large field of view. The Focal L-band Array for the Green Bank Telescope (FLAG) is one of the most sensitive PAFs developed so far. It consists of 19 dual-polarization elements mounted on a prime focus dewar resulting in seven beams on the sky. Its unprecedented system temperature of$\sim$17 K will lead to a 3 fold increase in pulsar survey speeds as compared to contemporary single pixel feeds. Early science observations were conducted in a recently concluded commissioning phase of the FLAG where we clearly demonstrated its science capabilities. We observed a selection of normal and millisecond pulsars and detected giant pulses from PSR B1937+21.