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MultiView phase corrections at low frequencies for precise astrometry

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arxiv 1804.02826 v1 pith:LUKTNQ3E submitted 2018-04-09 astro-ph.IM

MultiView phase corrections at low frequencies for precise astrometry

classification astro-ph.IM
keywords astrometrymultiviewfrequenciesobservationsoroszphaseriojaaccurate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a multi-calibrator solution, i.e. MultiView, to achieve accurate astrometry on the level of the thermal noise at low VLBI frequencies dominated by ionospheric residuals. We demonstrate on L-band VLBA observations how MultiView provides superior astrometry to conventional phase referencing techniques (Rioja et al. 2017). We also introduce a new trial method to detect antenna based systematic errors in the observations (Orosz et al. 2017}. All presented methods and results are based on our recent papers (Orosz et al. 2017; Rioja et al. 2017).

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