The International Pulsar Timing Array: second data release

Creators: Perera, B. B. P.; Taylor, S. R.

Abstract

In this paper, we describe the International Pulsar Timing Array second data release, which includes recent pulsar timing data obtained by three regional consortia: the European Pulsar Timing Array, the North American Nanohertz Observatory for Gravitational Waves, and the Parkes Pulsar Timing Array. We analyse and where possible combine high-precision timing data for 65 millisecond pulsars which are regularly observed by these groups. A basic noise analysis, including the processes which are both correlated and uncorrelated in time, provides noise models and timing ephemerides for the pulsars. We find that the timing precisions of pulsars are generally improved compared to the previous data release, mainly due to the addition of new data in the combination. The main purpose of this work is to create the most up-to-date IPTA data release. These data are publicly available for searches for low-frequency gravitational waves and other pulsar science.

Additional Information

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 October 7. Received 2019 September 8; in original form 2019 July 29. Published: 12 October 2019. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The NANOGrav Physics Frontiers Center is supported by NSF award number 1430284. The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Arecibo Observatory is operated by the University of Central Florida, Ana G. Mendez-Universidad Metropolitana, and Yang Enterprises under a cooperative agreement with the National Science Foundation (NSF; AST-1744119). The Parkes telescope is part of the Australia Telescope which is funded by the Commonwealth Government for operation as a National Facility managed by CSIRO. The Westerbork Synthesis Radio Telescope is operated by the Netherlands Institute for Radio Astronomy (ASTRON) with support from The Netherlands Foundation for Scientific Research NWO. The 100-m Effelsberg Radio Telescope is operated by the Max-Planck-Institut für Radioastronomie at Effelsberg. Some of the work reported in this paper was supported by the ERC Advanced Grant 'LEAP', Grant Agreement Number 227947 (PI Kramer). Pulsar research at the Jodrell Bank Centre for Astrophysics is supported by a consolidated grant from STFC. The Nancay radio telescope is operated by the Paris Observatory, associated with the Centre National de la Recherche Scientifique (CNRS) and acknowledges financial support from the 'Programme National de Cosmologie et Galaxies (PNCG)' and 'Gravitation, Références, Astronomie, Métrologie (GRAM)' programmes of CNRS/INSU, France. The Flatiron Institute is supported by the Simons Foundation. This work was supported by the NANOGrav Physics Frontiers Center (NSF award 1430284). Parts of this research were conducted by the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), through project number CE170100004. SO and RS acknowledge Australian Research Council grant FL150100148. SMR is a CIFAR Fellow. GD and KL acknowledges financial support by the European Research Council for the ERC Synergy Grant BlackHoleCam under contract no. 610058. KJL is supported by XDB23010200, NSFC U15311243, 2017YFA0402600 and funding from TianShanChuangXinTuanDui and Max-Planck Partner Group. MAM and SBS are supported by NSF award number 1458952. JBW is supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences. WWZ is supported by Chinese Academy of Science Pioneer Hundred Talents Program, the Strategic Priority Research Program of the Chinese Academy of Sciences Grant No. XDB23000000, and by the National Natural Science Foundation of China under grant No. 11743002, 11873067. Part of this research was performed at the Jet Propulsion Laboratory, under contract with the National Aeronautics and Space Administration. JS and MV acknowledges support from the JPL R&TD program. Basic pulsar research at NRL is funded by the Chief of Naval Research. Pulsar research at UBC is supported by an NSERC Discovery Grant and by the Canadian Institute for Advanced Research.

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