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Polarization calibration techniques for the new-generation VLBI

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Polarization calibration techniques for the new-generation VLBI

dc.contributor.author	Martí Vidal, Iván
dc.contributor.author	Mus, Alejandro
dc.contributor.author	Janssen, Michael
dc.contributor.author	Vicente, Pablo de
dc.contributor.author	González, J.
dc.date.accessioned	2022-05-19T12:53:58Z
dc.date.available	2022-05-19T12:53:58Z
dc.date.issued	2021
dc.identifier.citation	Martí Vidal, Iván Mus, Alejandro Janssen, Michael Vicente, Pablo de González, J. 2021 Polarization calibration techniques for the new-generation VLBI Astronomy & Astrophysics 646 A52 1 10
dc.identifier.uri	https://hdl.handle.net/10550/82878
dc.description.abstract	The calibration and analysis of polarization observations in very long baseline interferometry (VLBI) requires the use of specific algorithms that suffer from several limitations, closely related to assumptions in the data properties that may not hold in observations taken with new-generation VLBI equipment. Currently, the instantaneous bandwidth achievable with VLBI backends can be as high as several gigahertz, covering several radio bands simultaneously. In addition, the sensitivity of VLBI observations with the most updated equipment may reach dynamic ranges of tens of thousands, both in total intensity and polarization. In this paper, we discuss the impact of the limitations of common VLBI polarimetry algorithms on narrow-field observations taken with modern VLBI arrays, from the VLBI Global Observing System to the Event Horizon Telescope, and present new software that overcomes these limitations. In particular, our software is able to perform a simultaneous fit of multiple calibrator sources, include nonlinear terms in the model of the instrumental polarization and use a self-calibration approach for the estimate of the polarization leakage in the antenna receivers.
dc.language.iso	eng
dc.relation.ispartof	Astronomy & Astrophysics, 2021, vol. 646, num. A52, p. 1-10
dc.subject	Astrofísica
dc.subject	Astronomia
dc.title	Polarization calibration techniques for the new-generation VLBI
dc.type	journal article	es_ES
dc.date.updated	2022-05-19T12:53:58Z
dc.identifier.doi	10.1051/0004-6361/202039527
dc.identifier.idgrec	153669
dc.rights.accessRights	open access	es_ES