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dc.contributor.authorWang, J.
dc.contributor.authorColes, W.
dc.contributor.authorHobbs, G.
dc.contributor.authorShannon, Ryan
dc.contributor.authorManchester, R.
dc.contributor.authorKerr, M.
dc.contributor.authorYuan, J.
dc.contributor.authorWang, N.
dc.contributor.authorBailes, M.
dc.contributor.authorBhat, N.
dc.contributor.authorDai, S.
dc.contributor.authorDempsey, J.
dc.contributor.authorKeith, M.
dc.contributor.authorLasky, P.
dc.contributor.authorLevin, Y.
dc.contributor.authorOslowski, S.
dc.contributor.authorRavi, V.
dc.contributor.authorReardon, D.
dc.contributor.authorRosado, P.
dc.contributor.authorRussell, C.
dc.contributor.authorSpiewak, R.
dc.contributor.authorvan Straten, W.
dc.contributor.authorToomey, L.
dc.contributor.authorWen, L.
dc.contributor.authorYou, X.
dc.contributor.authorZhu, X.
dc.date.accessioned2017-07-27T05:20:38Z
dc.date.available2017-07-27T05:20:38Z
dc.date.created2017-07-26T11:11:22Z
dc.date.issued2017
dc.identifier.citationWang, J. and Coles, W. and Hobbs, G. and Shannon, R. and Manchester, R. and Kerr, M. and Yuan, J. et al. 2017. Comparison of pulsar positions from timing and very long baseline astrometry. Monthly Notices of the Royal Astronomical Society. 469 (1): pp. 425-434.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/54338
dc.identifier.doi10.1093/mnras/stx837
dc.description.abstract

Pulsar positions can be measured with high precision using both pulsar timing methods and very long baseline interferometry (VLBI). Pulsar timing positions are referenced to a solar-system ephemeris, whereas VLBI positions are referenced to distant quasars. Here, we compare pulsar positions from published VLBI measurements with those obtained from pulsar timing data from the Nanshan and Parkes radio telescopes in order to relate the two reference frames. We find that the timing positions differ significantly from the VLBI positions (and also differ between different ephemerides). A statistically significant change in the obliquity of the ecliptic of 2.16 ± 0.33 mas is found for the JPL ephemeris DE405, but no significant rotation is found in subsequent JPL ephemerides. The accuracy with which we can relate the two frames is limited by the current uncertainties in the VLBI reference source positions and in matching the pulsars to their reference source. Not only do the timing positions depend on the ephemeris used in computing them, but also different segments of the timing data lead to varying position estimates. These variations are mostly common to all ephemerides, but slight changes are seen at the 10 μas level between ephemerides.

dc.publisherOxford University Press
dc.titleComparison of pulsar positions from timing and very long baseline astrometry
dc.typeJournal Article
dcterms.source.volume469
dcterms.source.number1
dcterms.source.startPage425
dcterms.source.endPage434
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusOpen access


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