Precision southern hemisphere VLBI pulsar astrometry II: Measurement of seven parallaxes
A. T. Deller, S. J. Tingay, M. Bailes, J. E. Reynolds

TL;DR
This study measured seven new pulsar parallaxes using VLBI in the southern hemisphere, refining distance estimates and revealing significant uncertainties in electron density models, with implications for pulsar physics and Galactic studies.
Contribution
First VLBI parallax measurements for seven southern pulsars, improving distance accuracy and highlighting model uncertainties and their effects on pulsar physics.
Findings
Seven new pulsar parallaxes measured.
Revised distances alter pulsar energy conversion estimates.
Distance errors bias pulsar velocity distribution.
Abstract
Accurate measurement of pulsar distances via astrometry using very long baseline interferometry enables the improvement of Galactic electron density distribution models, improving distance estimates for the vast majority of pulsars for which parallax measurements are unavailable. However, pulsars at southern declinations have been under-represented in previous interferometric astrometry campaigns. In order to redress this imbalance, we have conducted a two-year astrometric campaign targeting eight southern pulsars with the Australian Long Baseline Array. The program summarized in this paper has resulted in the measurement of seven new pulsar parallaxes, with success on objects down to a mean flux density of 0.8 mJy at 1600 MHz. Our results highlight the substantial uncertainties that remain when utilizing free electron density models for individual pulsar distances. Until this study,…
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