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Calibration database for the Murchison Widefield Array All-Sky Virtual Observatory

Published online by Cambridge University Press:  11 June 2020

Marcin Sokolowski*
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
Christopher H. Jordan
Affiliation:
Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia
Gregory Sleap
Affiliation:
Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA6845, Australia
Andrew Williams
Affiliation:
Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA6845, Australia
Randall Bruce Wayth
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia
Mia Walker
Affiliation:
Curtin Institute of Radio Astronomy, GPO Box U1987, Perth, WA6845, Australia
David Pallot
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, Crawley6009, Australia
Andre Offringa
Affiliation:
Netherlands Institute for Radio Astronomy (ASTRON), 7991 PD, Dwingeloo, The Netherlands Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700AV, Groningen, The Netherlands
Natasha Hurley-Walker
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
Thomas M. O. Franzen
Affiliation:
Netherlands Institute for Radio Astronomy (ASTRON), 7991 PD, Dwingeloo, The Netherlands
Melanie Johnston-Hollitt
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
David L. Kaplan
Affiliation:
Department of Physics, University of Wisconsin–Milwaukee, Milwaukee, WI53201, USA
David Kenney
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
Steven J. Tingay
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
*
Author for correspondence: Marcin Sokolowski, E-mail: marcin.sokolowski@curtin.edu.au

Abstract

We present a calibration component for the Murchison Widefield Array All-Sky Virtual Observatory (MWA ASVO) utilising a newly developed PostgreSQL database of calibration solutions. Since its inauguration in 2013, the MWA has recorded over 34 petabytes of data archived at the Pawsey Supercomputing Centre. According to the MWA Data Access policy, data become publicly available 18 months after collection. Therefore, most of the archival data are now available to the public. Access to public data was provided in 2017 via the MWA ASVO interface, which allowed researchers worldwide to download MWA uncalibrated data in standard radio astronomy data formats (CASA measurement sets or UV FITS files). The addition of the MWA ASVO calibration feature opens a new, powerful avenue for researchers without a detailed knowledge of the MWA telescope and data processing to download calibrated visibility data and create images using standard radio astronomy software packages. In order to populate the database with calibration solutions from the last 6 yr we developed fully automated pipelines. A near-real-time pipeline has been used to process new calibration observations as soon as they are collected and upload calibration solutions to the database, which enables monitoring of the interferometric performance of the telescope. Based on this database, we present an analysis of the stability of the MWA calibration solutions over long time intervals.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2020; published by Cambridge University Press

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