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Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope

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arxiv 2109.14234 v2 pith:UGWBDU3V submitted 2021-09-29 astro-ph.IM

Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope

W. A. van Cappellen , T. A. Oosterloo , M. A. W. Verheijen , E. A. K. Adams , B. Adebahr , R. Braun , K. M. Hess , H. Holties
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J. M. van der Hulst B. Hut E. Kooistra J. van Leeuwen G. M. Loose R. Morganti V. A. Moss E. Orr\'u M. Ruiter A. P. Schoenmakers N. J. Vermaas S. J. Wijnholds A. S. van Amesfoort M. J. Arts J. J. Attema L. Bakker C. G. Bassa J. E. Bast P. Benthem R. Beukema R. Blaauw W. J. G. de Blok M. Bouwhuis R. H. van den Brink L. Connor A. H. W. M. Coolen S. Damstra G. N. J. van Diepen R. de Goei H. D\'enes M. Drost N. Ebbendorf B. S. Frank D. W. Gardenier M. Gerbers Y. G. Grange T. Grit A. W. Gunst N. Gupta M. V. Ivashina G. I. G. J\'ozsa G. H. Janssen A. Koster G. H. Kruithof S. J. Kuindersma A. Kutkin D. M. Lucero Y. Maan F. M. Maccagni J. van der Marel A. Mika J. Morawietz H. Mulder E. Mulder M. J. Norden A. R. Offringa L. C. Oostrum R. E. Overeem Z. Paragi H. J. Pepping E. Petroff D. J. Pisano A. G. Polatidis P. Prasad J. P. R. de Reijer J. W. Romein J. Schaap G. W. Schoonderbeek R. Schulz D. van der Schuur A. Sclocco J. J. Sluman R. Smits B. W. Stappers S. M. Straal K. J. C. Stuurwold J. Verstappen D. Vohl K. J. Wierenga E. E. M. Woestenburg A. W. Zanting J. Ziemke
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keywords telescopesurveyapertifarraycoveringdatadeg2imaging
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We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed this telescope into a high-sensitivity, wide field-of-view L-band imaging and transient survey instrument. Using novel PAF technology, up to 40 partially overlapping beams can be formed on the sky simultaneously, significantly increasing the survey speed of the telescope. With this upgraded instrument, an imaging survey covering an area of 2300 deg2 is being performed which will deliver both continuum and spectral line data sets, of which the first data has been publicly released. In addition, a time domain transient and pulsar survey covering 15,000 deg2 is in progress. An overview of the Apertif science drivers, hardware and software of the upgraded telescope is presented, along with its key performance characteristics.

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