English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We describe a data reduction pipeline for VLBI astrometric observations ofpulsars, implemented using the ParselTongue AIPS interface. The pipelineperforms calibration (including ionosphere modeling), phase referencing withproper accounting of reference source structure, amplitude corrections forpulsar scintillation, and position fitting to yield the position, proper motionand parallax. The optimal data weighting scheme to minimize the total errorbudget of a parallax fit, and how this scheme varies with pulsar parameterssuch as flux density, is also investigated. The robustness of the techniquesemployed are demonstrated with the presentation of the first results from a twoyear astrometry program using the Australian Long Baseline Array (LBA). Theparallax of PSR J1559-4438 is determined to be 0.384 +- 0.081 mas (1 sigma),resulting in a distance estimate of 2600 pc which is consistent with earlier DMand HI absorption estimates.

Precision Southern Hemisphere pulsar VLBI astrometry: techniques and results for PSR J1559-4438