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Probing magnetar formation channels with high-precision astrometry: The progress of VLBA astrometry of the fastest-spinning magnetar Swift J1818.0–1607

Published online by Cambridge University Press:  27 February 2023

Hao Ding Open the ORCID record for Hao Ding [Opens in a new window] ,
Adam Deller ,
Marcus Lower  and
Ryan Shannon
Hao Ding
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia
Adam Deller
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia
Marcus Lower
Affiliation:
ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia CSIRO, Space and Astronomy, Epping, NSW 1710, Australia
Ryan Shannon
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia
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Abstract

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Boasting supreme magnetic strengths, magnetars are among the prime candidates to generate fast radio bursts. Several theories have been proposed for the formation mechanism of magnetars, but have not yet been fully tested. As different magnetar formation theories expect distinct magnetar space velocity distributions, high-precision astrometry of Galactic magnetars can serve as a probe for the formation theories. In addition, magnetar astrometry can refine the understanding of the distribution of Galactic magnetars. This distribution can be compared against fast radio bursts (FRBs) localized in spiral galaxies, in order to test the link between FRBs and magnetars. Swift J1818.0–1607 is the hitherto fastest-spinning magnetar and the fifth discovered radio magnetar. In an ongoing astrometric campaign, we have observed Swift J1818.0–1607 for one year using the Very Long Baseline Array, and have determined a precise proper motion as well as a tentative parallax for the magnetar.

Keywords

radio continuum: starspulsars: individual (Swift J1818.0–1607)stars: neutrontechniques: interferometrictechniques: high angular resolution
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 271 - 275
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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