Wideband timing of the Parkes Pulsar Timing Array UWL data
| Autor: | Małgorzata Curyło, Timothy T. Pennucci, Matthew Bailes, N. D. Ramesh Bhat, Andrew D. Cameron, Shi Dai, George Hobbs, Agastya Kapur, Richard N. Manchester, Rami Mandow, Matthew T. Miles, Christopher J. Russell, Daniel J. Reardon, Ryan M. Shannon, Renée Spiewak, Willem van Straten, Xing-Jiang Zhu, Andrew Zic |
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| Rok vydání: | 2022 |
| Předmět: | |
| DOI: | 10.48550/arxiv.2211.12924 |
| Popis: | In 2018 an ultra-wide-bandwidth low-frequency (UWL) receiver was installed on the 64-m Parkes Radio Telescope enabling observations with an instantaneous frequency coverage from 704 to 4032 MHz. Here, we present the analysis of a three-year data set of 35 millisecond pulsars observed with the UWL by the Parkes Pulsar Timing Array (PPTA), using wideband timing methods. The two key differences compared to typical narrow-band methods are, firstly, generation of two-dimensional templates accounting for pulse shape evolution with frequency and, secondly, simultaneous measurements of the pulse time-of-arrival (ToA) and dispersion measure (DM). This is the first time that wideband timing has been applied to a uniform data set collected with a single large-fractional bandwidth receiver, for which such techniques were originally developed. As a result of our study, we present a set of profile evolution models and new timing solutions including initial noise analysis. Precision of our ToA and DM measurements is in the range of 0.005 $-$ 2.08 $\mu$s and (0.043$-$14.24)$\times10^{-4}$ cm$^{-3}$ pc, respectively, with 94% of the pulsars achieving a median ToA uncertainty of less than 1 $\mu$s. Comment: 29 pages, 12 figures, Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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