Reducing Instrumental Errors in Parkes Pulsar Timing Array Data

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aut.relation.endpage94
aut.relation.issue2
aut.relation.journalThe Astrophysical Journal
aut.relation.startpage94
aut.relation.volume973
dc.contributor.authorRogers, Axl F
dc.contributor.authorvan Straten, Willem
dc.contributor.authorGulyaev, Sergei
dc.contributor.authorParthasarathy, Aditya
dc.contributor.authorHobbs, George
dc.contributor.authorChen, Zu-Cheng
dc.contributor.authorFeng, Yi
dc.contributor.authorGoncharov, Boris
dc.contributor.authorKapur, Agastya
dc.contributor.authorLiu, Xiaojin
dc.contributor.authorReardon, Daniel
dc.contributor.authorRussell, Christopher J
dc.contributor.authorZic, Andrew
dc.date.accessioned2024-10-02T03:49:33Z
dc.date.available2024-10-02T03:49:33Z
dc.date.issued2024-09-23
dc.description.abstractThis paper demonstrates the impact of state-of-the-art instrumental calibration techniques on the precision of arrival times obtained from 9.6 yr of observations of millisecond pulsars using the Murriyang 64 m CSIRO Parkes Radio Telescope. Our study focuses on 21 cm observations of 25 high-priority pulsars that are regularly observed as part of the Parkes Pulsar Timing Array project, including those predicted to be the most susceptible to calibration errors. We employ measurement equation template matching (METM) for instrumental calibration and matrix template matching (MTM) for arrival time estimation, resulting in significantly improved timing residuals with up to a sixfold reduction in white noise compared to arrival times estimated using scalar template matching and conventional calibration based on the ideal feed assumption. The median relative reduction in white noise is 33%, and the maximum absolute reduction is 4.5 μs. For PSR J0437−4715, METM and MTM reduce the best-fit power-law amplitude (2.7σ) and spectral index (1.7σ) of the red noise in the arrival time residuals, which can be tentatively interpreted as mitigation of 1/f noise due to otherwise unmodeled steps in polarimetric response. These findings demonstrate the potential to directly enhance the sensitivity of pulsar timing array experiments through more accurate methods of instrumental calibration and arrival time estimation.
dc.identifier.citationThe Astrophysical Journal, ISSN: 0004-637X (Print); 1538-4357 (Online), American Astronomical Society, 973(2), 94-94. doi: 10.3847/1538-4357/ad656e
dc.identifier.doi10.3847/1538-4357/ad656e
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/10292/18090
dc.publisherAmerican Astronomical Society
dc.relation.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ad656e
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.rights.accessrightsOpenAccess
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject0201 Astronomical and Space Sciences
dc.subject0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
dc.subject0306 Physical Chemistry (incl. Structural)
dc.subjectAstronomy & Astrophysics
dc.subject5101 Astronomical sciences
dc.subject5107 Particle and high energy physics
dc.subject5109 Space sciences
dc.titleReducing Instrumental Errors in Parkes Pulsar Timing Array Data
dc.typeJournal Article
pubs.elements-id569952
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