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Radio timing in a millisecond pulsar-extreme/intermediate mass ratio binary system

Kimpson, T; Wu, K; Zane, S; (2020) Radio timing in a millisecond pulsar-extreme/intermediate mass ratio binary system. Astronomy and Astrophysics , 644 , Article A167. 10.1051/0004-6361/202038561. Green open access

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Abstract

Radio timing observations of a millisecond pulsar in orbit around the Galactic centre black hole (BH) or a BH at the centre of globular clusters could answer foundational questions in astrophysics and fundamental physics. Pulsar radio astronomy typically employs the post-Keplerian approximation to determine the system parameters. However, in the strong gravitational field around the central BH, higher order relativistic effects may become important. We compare the pulsar timing delays given by the post-Keplerian approximation with those given by a relativistic timing model. We find significant discrepancies between the solutions derived for the Einstein delay and the propagation delay (i.e. Roemer and Sharpiro delay) compared to the fully relativistic solutions. Correcting for these higher order relativistic effects is essential in order to construct accurate radio timing models for pulsar systems at the Galactic centre and the centre of globular clusters and informing issues related to their detection.

Type: Article
Title: Radio timing in a millisecond pulsar-extreme/intermediate mass ratio binary system
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202038561
Publisher version: https://doi.org/10.1051/0004-6361/202038561
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10118324
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