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Title:
The UTMOST pulsar timing programme I: Overview and first results
Authors:
Jankowski, F.; Bailes, M.; van Straten, W.; Keane, E. F.; Flynn, C.; Barr, E. D.; Bateman, T.; Bhandari, S.; Caleb, M.; Campbell-Wilson, D.; Farah, W.; Green, A. J.; Hunstead, R. W.; Jameson, A.; Oslowski, S.; Parthasarathy, A.; Rosado, P. A.; Venkatraman Krishnan, V.
Affiliation:
AA(Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK; Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO) 0000-0002-6658-2811), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AC(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); Institute for Radio Astronomy and Space Research, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand 0000-0003-2519-7375), AD(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); SKA Organisation, Jodrell Bank Observatory, Cheshire, SK11 9DL, UK 0000-0002-4553-655X), AE(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AF(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 0000-0001-8715-9628), AG(Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AH(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia), AI(Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK; Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)), AJ(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AK(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia 0000-0002-0161-7243), AL(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AM(Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AN(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)), AO(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia 0000-0003-0289-0732), AP(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)), AQ(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AR(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO); Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 0000-0001-9518-9819)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 3, p.3691-3712 (MNRAS Homepage)
Publication Date:
04/2019
Origin:
OUP
Astronomy Keywords:
radiation mechanisms: non-thermal, instrumentation: interferometers, methods: data analysis, astrometry, ephemerides, pulsars: general
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty3390
Bibliographic Code:
2019MNRAS.484.3691J

Abstract

We present an overview and the first results from a large-scale pulsar timing programme that is part of the UTMOST project at the refurbished Molonglo Observatory Synthesis Radio Telescope (MOST) near Canberra, Australia. We currently observe more than 400 mainly bright southern radio pulsars with up to daily cadences. For 205 (8 in binaries, 4 millisecond pulsars), we publish updated timing models, together with their flux densities, flux density variability, and pulse widths at 843 MHz, derived from observations spanning between 1.4 and 3 yr. In comparison with the ATNF pulsar catalogue, we improve the precision of the rotational and astrometric parameters for 123 pulsars, for 47 by at least an order of magnitude. The time spans between our measurements and those in the literature are up to 48 yr, which allow us to investigate their long-term spin-down history and to estimate proper motions for 60 pulsars, of which 24 are newly determined and most are major improvements. The results are consistent with interferometric measurements from the literature. A model with two Gaussian components centred at 139 and 463 km s-1 fits the transverse velocity distribution best. The pulse duty cycle distributions at 50 and 10 per cent maximum are best described by lognormal distributions with medians of 2.3 and 4.4 per cent, respectively. We discuss two pulsars that exhibit spin-down rate changes and drifting subpulses. Finally, we describe the autonomous observing system and the dynamic scheduler that has increased the observing efficiency by a factor of 2-3 in comparison with static scheduling.
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