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Commissioning of FLAG: A phased array feed for the GBT

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arxiv 1710.09650 v1 pith:VRMV6GJE submitted 2017-10-26 astro-ph.IM

K. M. Rajwade , N. M. Pingel , R. A. Black , M. Ruzindana , M. Burnett , B. Jeffs , K. Warnick , D. J. Pisano
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D. R. Lorimer R. M. Prestage L. Hawkins J. Ray P. Marganian T. Chamberlin J. Ford W. Shillue D. A. Roshi
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keywords arrayflagcommissioningfeedphasedscienceadvancementastronomy
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abstract

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.

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