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

Astrometry can bring powerful constraints to bear on a variety of scientificquestions about neutron stars, including their origins, astrophysics,evolution, and environments. Using phase-referenced observations at the VLBA,in conjunction with pulsar gating and in-beam calibration, we have measured theparallaxes and proper motions for 14 pulsars. The smallest measured parallax inour sample is 0.13+-0.02 mas for PSR B1541+09, which has a most probabledistance of 7.2+1.3-1.1 kpc. We detail our methods, including initial VLAsurveys to select candidates and find in-beam calibrators, VLBAphase-referencing, pulsar gating, calibration, and data reduction. The use ofthe bootstrap method to estimate astrometric uncertainties in the presence ofunmodeled systematic errors is also described. Based on our newmodel-independent estimates for distance and transverse velocity, weinvestigate the kinematics and birth sites of the pulsars and revisit models ofthe Galactic electron density distribution. We find that young pulsars aremoving away from the Galactic plane, as expected, and that age estimates fromkinematics and pulsar spindown are generally in agreement, with certain notableexceptions. Given its present trajectory, the pulsar B2045-16 was plausiblyborn in the open cluster NGC 6604. For several high-latitude pulsars, theNE2001 electron density model underestimates the parallax distances by a factorof two, while in others the estimates agree with or are larger than theparallax distances, suggesting that the interstellar medium is irregular onrelevant length scales. The VLBA astrometric results for the recycled pulsarJ1713+0747 are consistent with two independent estimates from pulse timing,enabling a consistency check between the different reference frames.

Precision Astrometry with the Very Long Baseline Array: Parallaxes and Proper Motions for 14 Pulsars