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Title:
Demonstration of polarisation calibration with the LBA on Selected AGNs
Authors:
Chanapote, Thanapol; Dodson, Richard; Rioja, Maria; Asanok, Kitiyanee; Stevens, Jamie; Martí-Vidal, Iván
Affiliation:
AA(Department of Physics, Faculty of Science, Khon Kaen University, 123 Moo 16, T. Nai-Muang, A. Muang, Khon Kaen 40002, Thailand; International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Hwy, Perth WA 6009, Australia; National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand 0000-0002-6992-6755), AB(International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Hwy, Perth WA 6009, Australia), AC(International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Hwy, Perth WA 6009, Australia; CSIRO Astronomy and Space Science, P.O. Box 1130, Perth, WA 6102, Australia; Observatorio Astronómico Nacional (IGN), Alfonso XII, 3 y 5, 28014 Madrid, Spain), AD(Department of Physics, Faculty of Science, Khon Kaen University, 123 Moo 16, T. Nai-Muang, A. Muang, Khon Kaen 40002, Thailand; National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand), AE(CSIRO Australia Telescope National Facility, Paul Wild Observatory, Narrabri NSW 2390, Australia), AF(Yebes Observatory, Cerro de la Palera s/n, 19141, Yebes (Guadalajara), Spain)
Publication:
Publications of the Astronomical Society of Australia, Volume 36, id. e013 (PASA Homepage)
Publication Date:
03/2019
Origin:
CUP
Astronomy Keywords:
polarisation methods: data analysis
Abstract Copyright:
2019: Astronomical Society of Australia
DOI:
10.1017/pasa.2019.3
Bibliographic Code:
2019PASA...36...13C

Abstract

We present here the results from a full polarisation study, an important VLBI capability, of a selected set of bright Active Galactic Nuclei (AGNs), along with the steps required to fully calibrate the Australian Long Baseline Array. We compare strategies for high-precision polarisation measurements using two polarisation correction methods: (1) Linear model and (2) Ellipticity-Orientation model and two data-recording techniques: recording (1) nominally circular polarisation at all stations and (2) mixed polarisation, where all but one station record circular polarisation and the other recorded linear polarisation. The latter is corrected post-correlation. We explored these possible solution to discover which will best accommodate the heterogeneous nature of the Australian Long Baseline Array without impacting on the science results. The targets, all compact and of low polarisation fraction, allow us to compare multiple independent solutions for polarisation characteristics. The results show that the agreement between the two polarisation correction models is excellent. However, the values from Mopra with nominally circular polarisation are larger than would be acceptable. However, we also demonstrate that recording mixed polarisation modes and correcting post-correlation provide a high quality polarisation product. We report on the detailed tests of these strategies and assess that the array is ready for full polarisation operation.
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